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RGBTV-25F99 COLOUR TELEVISION
Service Manual
1. Technical specifications & Safety precautions..................................... 2 2. Servicing precautions................................ 3 3. Functions & Location of controls............... 8 4. Brief operation instructions........................ 10 5. Disassembly instructions........................... 11 6. Specific information.................................. 13 7. Electrical adjustment.................................. 30 8. Information of Resistors and capacitors..... 32 9. Damageable parts list................................ 34 10.System block diagram............................... 35
Features
64cm pure flat picture tube Auto search 218 programs presetting and memory Child Lock & On Screen Help Function 16:9 Mode
Haier group
Contents
Technical specifications & Safety precautions................... 2 Servicing precautions........................................................ 3 Functions & Location of controls........................................ 8 Brief operation instructions.................................................. 10 Disassembly instructions..................................................... 11 Important notes Precautions for handling of picture tube Exploded of cabinet parts 6. Specific informations............................................................ 13 Principle integrated circuits Service mode and adjusting items and datas Error detection process 7. Electrical adjustment............................................................ 30 8. Information of Resistors and capacitors............................... 32 Terminal view of transistors...................................................33 9. Damageable parts list.......................................................... 34 10. System block diagram......................................................... 35 Circuits diagram................................................................... 36 1. 2. 3. 4. 5.
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I. TECHNICAL SPECIFICATION & SAFETY PRECAUTIONS
POWER SUPPLY: AC 150-250V, 50 Hz
* Tuning system: voltage synthesized type autosearch fine tuning system * Power consumption: ¡Ü120W * Antenna input impedance: 75¦¸ * Receiving system: a) Color system: PAL/SECAM/NTSC3.58MHZ/4.43MHZ b) Broadcast TV system: D/K, B/G, I, M * Language displayed: English/Russian * Video input: 1.0VPP (75¦¸) * Video output: 1.0VPP (75¦¸) * Audio input: 436m Vrms (40K¦¸) * Audio output: 436m Vrms (more than 600K¦¸)
SAFETY PRECAUTIONS
INPORTANT SAFETY NOTICE These parts are identified by many electrical and mechanical parts in this chassis have special safetyrelated characteristics. ! in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent XRADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of the manufacturer. General Guidance An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents that might result in personal injury caused by electrical shocks. It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that might be inadvertently introduced during the service operation. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB. Keep wires away from high voltage or high temperature parts. Due to the high vacuum and large surface area of the picture tube, extreme care should be taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck. X-RAY Radiation Warning: The source of XRAY RADIATION in this TV receiver is the High Voltage Section and the Picture Tube. For continued XRAY RADIATION protection, the replacement tube must be of the same type as specified in the Replacement Parts List. Before returning the receiver to the customer Always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to make sure that the set is safe to operate without any danger of electrical shock.
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II SERVICEING PRECAUTIONS
Warning and cautions
1. When you clean the TV set, please pull out the power plug from AC outlet. Don't clean the cabinet and the screen with benzene, petrol and other chemicals. 4. To prevent the TV set from firing and electric shock, don't make the TV set rain or moisture.
2. In order to prolong the using life of the TV set, please place it on a ventilated place.
5. Don't open the back cover, otherwise it is possible to damage the components in the TV set and harm you.
3. Don't place the TV set in the sunshine or near heat source.
6. When the TV set isn't going to be used for long time or it is in thunder and lightening, please pull out the plug from AC outlet and the antenna plug from the cover of the TV set.
Explanation on the display tube
Generally, it is not needed to clean the tube surface. However, if necessary,its surface can be cleaned with a dry cotton cloth after cutting off the power.Don't use any cleanser. If using hard cloth, the tube surface will be damaged.
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CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions. Remember : Safety First. General Servicing Precautions 1. Always unplug the receiver AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board module or any other assembly of the receiver. b. Disconnecting or reconnecting any receiver electrical plug or other electrical connection. c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver. CAUTION: A wrong substitution part or incorrect installation polarity of electrolytic capacitors may result in an explosion hazard. d. Discharging the picture tube anode. 2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltagemeasuring device (DVM, FETVOM, etc.) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc". 3. Discharge the picture tube anode only by (a) first connecting one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touch the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage. 4. Do not spray chemicals on or near this receive or any of its assemblies. 5. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cottontipped stick or comparable nonabrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol (90%~99% strength) CAUTION: This is a flammable mixture. Unless specified otherwise in this service manual, lubrication of contacts is not required. 6. Do not defeat any plug / socket B+ voltage interlocks with which receivers covered by this service manual might be equipped. 7. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solidstate device heat sinks are correctly installed. 8. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. 9. Use with this receiver only the test fixtures specified in this service manual. CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are usually called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly
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on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a groundedtip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic type folder removal device. Some solder removal devices not classified as "antistatic" can generate electrical charges sufficient to damage ES devices. 5. Do not use freonpropelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise even some normally harmless motions such as mutual brushing of your clothes' fabric or lifting of your foot from a carpeted floor might generate static electricity sufficient to damage an ES device.) General Soldering Guidelines 1. Use a grounded tip, low wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range of 500 oF to 600 oF. 2. Use an appropriate gauge of RMA resincore solder composed of 60 parts tin/40 parts lead. 3. Keep the soldering iron tip clean and well tinned. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freonpropelled spayon cleaners. 5. Use the following unsoldering technique a. Allow the soldering iron tip to reach normal temperature.(500 o F to 600o F) b. Heating the component lead until the solder melts. c. Quickly draw the melted solder with an antistatic, suctiontype solder removal device with solder braid. CAUTION: Work quickly to avoid overheating the circuit board printed foil. 6. Use the following unsoldering technique a. Allow the soldering iron tip to reach normal temperature.(500 o F to 600o F ) b. First, hold the soldering iron tip and solder the strand against the component lead until the solder melts. c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil. d. Closely inspect the solder area and remove any excess or splashed solder with a small wirebristle brush. Remove /Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are of slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined . Removal Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts. Draw away the melted solder with an antistatic suctiontype solder removal device (or
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with solder braid) before removing the IC. Replacement Carefully insert the replacement IC in the circuit board. Carefully bend each IC lead against the circuit foil pad and solder it. Clean the soldered areas with a small wirebristle brush.(It is not necessary to reapply acrylic coating to the areas). "SmallSignal" Discrete Transistor Removal/Replacement Remove the defective transistor by clipping its leads as close as possible to the component body. Bend into a "U" shape the end of each of three leads remaining on the circuit board. Bend into a "U" shape the replacement transistor leads. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection. Power Output, Transistor Device Removal/Replacement Heat and remove all solder from around the transistor leads. Remove the heat sink mounting screw (if so equipped). Carefully remove the transistor from the heat sink of the circuit board. Insert new transistor in the circuit board. Solder each transistor lead, and clip off excess lead. Replace heat sink. Diode Removal/Replacement Remove defective diode by clipping its leads as close as possible to diode body. Bend the two remaining leads perpendicularly to the circuit board. Observing diode polarity, wrap each lead of the new diode round the corresponding lead on the circuit board. Securely crimp each connection and solder it. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder. Fuse and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. 3. Solder the connections CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds foil to the circuit board causing the foil to separate from or "liftoff" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board.(Use this technique only on IC connections). 1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary). 2. Carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern. 3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.
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4. Route the jumper wire along the path of the outaway copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire. At other connections Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board. 1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if the jumper wire opens. 2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern. 3. Connect insulated 20gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components or sharp edges.
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III.FUNCTIONS & LOCATION OF CONTROLS
* Complete frequency range CATV (470MHz) * Preset of 218 programs. Curtaindrawing type of display when powered up. * Various kinds of picture modes and sound modes * Screen display of menu in English/Russian * Program scan * Surrounding stereo * I2C bus control with digital technology * Zooming of pictures
Location of controls Front and side panel of the TV set
S-video terminal
S-VIDEO
Side-set terminals
VIDEO
Video terminal
L
Remote sensor window
AUDIO
Left sound track Right sound track
R
TV/AV MENU
VOL
CH
Menu control buttons
*When using S-video terminal, please pull out video 1 input terminal.
Rear panel of the TV set
Antenna input
Video output terminals: VIDEO, AUDIO, L, R Video 2 input terminals: VIDEO, AUDIO, L, R
+
-
+
-
Video 1 input terminals
Power switch
AUDIO VIDEO
L
R
OUT
IN
8
Buttons on the remote controller Remote control
1 4
2 5 8 0
3
Standby
6 9
+
Program number
7
TV/AV
Display on the screen Sleep timer
HELP
Help Former programme Mono/stereo
AV/TV exchange Mute
P
Program up Volume down
SCAN
Calling menu
MENU
P
+
ZOOM
Volume up Program down Zoom
Program scan
PIC SOU TUN FUNC
Setting picture menu Setting audio menu Picture mode
P.STD S.STD
Setting function menu Setting channel menu Audio mode
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IV. BRIEF OPERATION INSTRUCTIONS
Insert the power plug into the power line socket and insert the antenna plug into the antenna socket on the rear panel. Press down the power switch of the TV set. The red indicator light goes on. Follow the steps below. A£®Program preset 1. Auto searching and storing program Press MENU or TUN to enter the Search Menu. Press Program up/down buttons to select COLOR SYSTEM and SOUND SYSTEM. Press VOLUME buttons to select the system. Press Program up/down buttons to select AUTO SEARCH and press VOLUME buttons to search automatically. When the search finishes, all the programs will be stored automatically and the TV returns to normal status. 2. Manual search and fine tune Press MENU or TUN repeatedly to enter the Search Menu. Press Program up/down buttons to select COLOR SYSTEM and SOUND SYSTEM. Press VOLUME buttons to select the system. Press Program up/down buttons to select FREQUENCY RANGE and PROGRAM NUMBER. Press VOLUME buttons to set and Program up/down buttons to select MANUAL CHANNEL SEARCHING. Press VOLUME buttons to search manually. When the search finishes, all the programs will be stored automatically and the TV returns to normal status. If the effect is not good, press Program up/down buttons to select FINE TUNE and press VOLUME buttons until the optimum effect is achieved. 3. Deleting channel number Press MENU or TUN repeatedly to enter the Search Menu. Press Program up/down buttons to select SKIP. Press VOLUME buttons until the OFF item lights. Now the program number is deleted. Repeat the above steps, when the item lights, the deleted program number can be resumed. B. Volume tuning Press VOLUME buttons to increase or decrease the volume. C. Personal preference setting 1. Picture effect Press P.STD repeatedly to change among PERSONAL, STANDARD, DYNAMIC, SOFT and NATURAL. 2. Sound effect Press S.STD repeatedly to change among PERSONAL, STANDARD, MUSIC, FILM and LANGUAGE
.
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V. DISASSEMBLY INSTRUCTIONS
A. Important note This set is disconnected from the power supply through the converter transformer. An isolating transformer is necessary to service operations on the primary side of the converter transformer. Back Cabinet Removal Remove the screw residing on the back cabinet and carefully separate the back cabinet from the front cabinet. B. Picture tube handling caution Due to high vacuum and large surface area of picture tube, great care must be exercised when handling picture tube. Always lift picture tube by grasping it firmly around faceplate. NEVER LIFT TUBE BY ITS NECK! The picture tube must not be scratched or subjected to excessive pressure as fracture of glass may result in an implosion of considerable violence which can cause personal injury or property damage.
EXPLODED VIEW OF CABINET PARTS Model: RGBTV-25F99
4 3 6
7
5
2
1
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Exploded view parts list
Model: RGBTV-25F99
NO. 1 2 3 4 5 6 7 Name of part Front frame Left speaker Right speaker Color picture tube Bracket Rear cover Flank AV Part specialized code 0090200120 0094000018 0094000018 0094000927 0090802087 0090801480 0094300018 QTY. 1 1 1 1 1 1 1
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VI.SPECIFIC INFORMATIONS
A. Principle integrated circuits 1. RGBTV25F99 color TV set composed of the following sections (1) Microprocessor control: microprocessor N901 (WH2000) and memory N902 (KS24C08). (2) Small signal processing: super monolithic integrated circuits N201 (TDA8844) (3) Sound processing and power amplifying: integrated circuits N701 (TDA9859) and sound power amplifying integrated circuits N601 (TDA7297) (4) Line and field scan output integrated circuits: field output integrated circuits N301 (TDA8350Q), line output tube V403 (2SD1887YD), line output transformer T444 (BSC285314F) (5) Video amplifying: video amplifying integrated circuits N501 (TDA6107Q) (6) Switch power supply: switch transformer T801 (BCK10002), power integrated circuits N801 (KA3S0680RFBYDTU), secondary power integrated circuits N804 (KA7630) 2. Main integrated circuits: (1) WH2000 (2) TDA8844 scan/color decoding (3) TDA9859 circuits (4) TDA8350Q (5) TDA6107Q (6) TDA7297 (7) KA3S0680RFBYDTU (8) KA7630 3. Electrical circuit analysis 1. Microprocessor WH2000 Information introducing functions and testing data for maintenance is listed in Table 1. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used. Microprocessor Picture IF/sound IF/video processing/line and field Multifunction TV stereo sound processing integrated Field output integrated circuits Video amplifying integrated circuits Sound power amplifying integrated circuits Power integrated circuits Secondary power integrated circuits
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Table 1 Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25
Function Tuning voltage control output UHF channel selection control VHF-H channel selection control VHF-L channel selection control B/G sound system selection control D/K sound system selection control I sound system selection control M sound system selection control Local control keyboard input Local control keyboard input Geomagnetic adjustment input, not selected PAL/NTSC system selection Grounding Neutral point Neutral point Myopia prevention PVD input, not selected Mute control output Timer control output Standby control output Power signal output Translucence background output, not selected Screen display B signal output Screen display G signal output Screen display R signal output Blanking signal output Line return pulse signal input, character horizontal locating Field return pulse signal input, character vertical locating Character oscillation Character oscillation Grounding 7.3MHz crystal oscillation connection, master clock oscillation 7.3MHz crystal oscillation connection, master clock oscillation
Working Voltage (V) 4.1 0 0 5 0.3 5 5 4.1 5 5 0 5 0 0 0.9 5 0 0.2 0 4.9 0 0 0 0 0 4.5 5.1 2.2 2.3 0 2 2
Ground Resistance (R) Positive Negative (¦¸) (¦¸) 19.9K 19.9K 3.7M 2.4M 3.7M 2.4M 3.7M 2.4M 3.7M 1.4M 3.7M 1.4M 3.7M 1.4M 3.6M 1.5M 33K 26K 33K 26K 3.8M 2.4M 3.8M 0 ~ ~ 9.9K 33K 30K 30K 5.6K 33K 1.4M 1.5M 1.5M 3.7M 33K 34K 3.4M 3.4M 0 3.7M 3.7M 2.4M 0 2.3M 2.3M 9.9K 27K 22.6K 23K 5.6K 26.9K 2.4M 2.5M 2.5M 2.5M 27K 27K 2.3M 2.3M 0 2.5M 2.5M
26 27 28 29 30 31 32
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33 34 35 36 37 38 39 40 41 42
Clearing recovery, low-level effective +5V power supply Neutral point Remote control signal input Grounding Production control Brightness and color segregation control AV1, AV2 and SVHS switching control input I2C serial bus clock line I2C serial bus datum line
4.3 5 0 5 0 5 0 0 3.9 4.0
3.7M 29K 3.8M 62K 0 33K 24K 24K 31K 31K
2.5M 21.8K 2.4M 38M 0 27K 23.9K 23.8K 24K 24K
2. Decoding integrated circuits TDA8844 TDA8844 is super large integrated circuit decoder, containing intermediate image amplifying, intermediate sound amplifying, line and field scan, small signal processing, color decoding, color brightness segregation, hipressure tracing and overload protection, I2C bus control, EW correction and automatic darkness adjustment. Information introducing functions and testing data for TDA8844 maintenance is listed in Table 2. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used.
Table 2 Step 1 2 3 4 5 6 7 8 9 10 11 12 Function Secondary sound IF input External sound frequency signal input Image IF PLL, not applied Image IF PLL, not applied RC filter connected for PLL circular wave Video frequency output I2C serial bus clock line I2C serial bus datum line Trap decoupling S-VHS C signal input S-VHS Y signal input, front AV video input +8V power input Working Voltage (V) 0 3.7 0 0 2.5 3 3.9 4 6.7 1.1 3.4 8 Ground Resistance (R) Positive Negative (¦¸) (¦¸) 1.4 1 6.2M 4.7M ~ ~ 6.2M 4.3M 31K 31K 6.0M 88.1K 6.1M 2.8K ~ ~ 4.2M 4.7M 24.3K 24.3K 4.1M 87.7K 4.5M 2.8K
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13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
Internal video signal input Grounding Audio signal input SECAM decoder decoupling External video signal input Dark current test input B signal output G signal output R signal output Beam current limit and field max. cut-out input R signal input G signal input B signal input Blanking signal input Y signal input Y signal output B-Y signal output R-Y signal output B-Y signal input R-Y signal input Standard color sub-carrier wave output, not applied 3.58M crystal oscillator connection 4.43M crystal oscillator connection Croma decoding filter connection +8V power supply CVBS output Power supply decoupler filtering Line pumping signal output Line return pulse signal input and sand pulse output PH-2 wave filter PH-1 wave filter Grounding E-W correction output Field pumping signal inversion output Field pumping signal positive output Intermediate image signal input Intermediate image signal input
3.9 0 3 0 3.4 5.1 3.2 3.1 3.0 2.4 3.3 3.3 3.3 0.3 2.7 2.7 2.3 2.3 2.3 2.3 4.3 2.5 2.5 4.9 8.0 2.6 5 0.4 0.4 3.2 4.0 0 0.7 2.3 2.3 4.6 4.6
3.9M 0 6.2M ~ 6.1M 4.4M 7.6K 7.5K 7.5K 218.8K 6.1M 6.1M 6.1M 1K 5.9M 5.9M 5.8M 5.8M 5.8M 5.8M 6.1M 6.2M 6.2M 6.2M 2.8K 4.6M 6.0M 6.1K 6.1M 6.1M 6.1M 0 62.5K 70.4K 67.4K 89.2K 89.2K
3.6M 0 4.7M ~ 4.4M 3.7M 7.6K 7.5K 7.6K 239.0K 4.6M 4.6M 4.6M 1K 4.3M 4.3M 4.2M 4.2M 4.2M 4.3M 4.2M 4.6M 4.5M 4.5M 2.8K 4.6M 380.5K 6.1K 2.1M 4.4M 4.4M 0 62.4K 70.3K 67.3K 89.5K 89.5K
16
50
High pressure tracing and circuit breaker input Capacitor connection from field tooth wave Field reference current formation AGC decoupling RF AGC output Audio frequency connection without aggregation Sound demodulation and decoupling
2.5
23.1K
22.8K
51 52 53 54 55 56
3.8 3.9 4.3 1.9 2.9 2.3
6.2M 39.0K 6.2M 4.8K 4.5M 6.2M
4.6M 39K 4.6K 4.8K 4.6M 4.6M
3. Analysis of common path circuits High frequency television signals, received via an antenna (or transmitted through a cable TV system) to the input terminal of the high frequency tuner TU101 (TECC7949), are processed for tuning and high frequency amplifying and mixing, then a 38MHz image intermediate frequency and 31.5MHz sound intermediate frequency signal will be released at the IF terminal of TU101 to (1) of the thickfilm circuits N101 (M9911A), where signals are amplified to compensate for the insertion losses of the sound surface wave filter. Single or dualended input is used for the sound surface wave filters SF101 (K6265K) of this appliance according to system properties. Single or dualended input is controlled by CPU N901 (12) through V101 (BC548C). D/K, B/G, I signals are for singleended input and M signals are for dualended input. The sound surface filter K6265K functions as a wide band wave filter, suitable for D/K, B/G and I sound signals, if the input is singleended. Dualended input is for a narrow wave filter, suitable for M sound signals. Intermediate frequency signals will be transmitted to (48) and (49) of N201 (TDA8844) after the sound carrier frequency is trapped by the sound surface wave filter. The AGC time constant is dependent on C243 (lu) connected to (53) of N201(TDA8844), and the AGC is controlled by I2C busmastering and output through (54) of N201 (TDA8844) to determine the high frequency tuner increase. 4. Analysis of secondary sound intermediate wave filter and wave trap selection switch circuits. Video combined television signals output from N201 (6) of (TDA8844) through the triode V203 and/or V204 is transmitted to the wave filter Z202Z205 and trap Z207Z210, respectively. Some combined television signals through C212 are filtered through the diode. The diode positive voltage VD201VD204 is 4V, and the negative voltage is controlled by (5) (8) of CPU N901 sound system control terminal through a 1K resistor. When one CPU base pin has a low electrical value, the corresponding diode is energized and the combined television signals form the secondary sound intermediate signals through a corresponding wave filter (Z202 or Z205) before being transmitted to (1) of N201 (TDA8844) through V202.
17
Some other combined television signals are connected via V205 and V206, which are band eliminating triodes functioning as switches. When the 12 base pin of CPU has a high electrical output level, V206 is connected using PAL system signals. When 12 base pin has a low electrical output level, V206 is disconnected and V205 is connected for NTSC3.58 system signals. Combined television signals will become video signals after the wave trapper, which will adjust to the correct range through R225 (430 ) and R224 (470 ) and is then transmitted to (13) of N201 (TDA8844) through C218 (474). Post video signals are transmitted to (17) of N201 (TDA8844) and front video signals and Y signals from terminal S are transmitted to (11) of N201 (TDA8844) through C215 (474). C signals from terminal S are transmitted to (10) of N201 (TDA8844). Connection of front AV signals and signals from terminal S are controlled by the I2C serial bus system in N201 (TDA8844). 5. Analysis of sound acoustic effect electrical circuits Electrical circuits for sound acoustic effects processing are composed of integrated circuits N701 (TDA9859) and peripheral components. TDA9859 is an integrated circuit for HiFi multi audio signals from left and right tracks of terminal AV1 are added to (1) functional TV sound acoustic effect processing, including high and bass frequency division, stereo and surround sound. The audio signals from (55) of N201 are transmitted through V211, then divided into two groups after the decoupling capacitor C706 (224) and added to (3 s from (55) of N201 are transmitted through V211, then divided into two groups after the decoupling capacitor C706 (224) and added to (3 The left and right tracks of terminal AV2 are added to (28) and (30) of N701 (TDA9859). TV or AV audio signals are processed for acoustic effects in N701 (TDA9859), and the audio signals from left and right tracks of (18) and (15) are transmitted directly to (12) and (4) of the integrated circuit N601 (TDA7297) of the sound power amplifier. Capacitors C717 (562) and C714 (562) connected to (19) and (14) of N701 (TDA9859) control high frequency from the left and right tracks. Information introducing functions and testing data for maintenance is listed in Table 3. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used.
Table 3 Step 1 2 3 4 5 6 7 Function Front AV frequency left track input Neutral point Internal audio frequency input Power decoupling wave filtering Internal audio frequency input 8V power supply AV frequency right track output Working Voltage (V) 4.0 0 4.0 7.9 4.0 8.0 4.0 Ground Resistance (R) Positive Negative (¦¸) (¦¸) 4.6M 3.1M 6.9M 4.7M 9.1K 4.6M 2.8K 6.5M 4.9M 3.1M 9.1K 3.1M 2.8K 4.3M
18
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Grounding Right track audio frequency output Right track audio frequency input Bass control capacitor connection Bass control capacitor connection Neutral point High control capacitor connection Audio frequency output and right track I2C bus clock line I2C bus datum line Audio frequency output and left track High control capacitor connection Neutral point Bass control capacitor connection Bass control capacitor connection Left track audio frequency input Left track audio frequency output Grounding AV frequency left track output
Imitation connection stereo capacitor
0 4.0 4.0 4.0 4.0 0 4.0 4.0 4.4 4.5 4.0 4.0 0 4.0 4.0 4.0 4.0 0 4.0 4.0 4.0 4.0 4.0 0 4.0
0 10.8K 4.6M 4.6M 4.7M ~ 6.2M 8.8K 19K 19K 8.9K 6.2M ~ 4.6M 4.6M 4.6M 10.8K 0 6.5M 4.6M 4.6M 4.6M 4.6M 6.9M 4.6M
0 10.8K 3.1M 3.1M 3.1M ~ 4.2M 8.8K 17.9K 18.0K 8.9K 4.3M ~ 3.2M 3.2M 3.2M 10.8K 0 4.3M 3.2M 3.2M 3.2M 3.2M 4.8M 3.2M
Rear AV frequency left track input Imitation stereo capacitor connection Rear AV frequency right track input Neutral point Front AV frequency right track input
19
6. Analysis of sound and bass power amplifying circuits Sound power amplifying circuits are composed of integrated circuits TDA7297 and peripheral components. TDA7297 is an integrated electrical circuit for muting and power for double track stereo sound power amplifying with an output power of 15+15W. The output of TDA7297 for sound is BTL and no decoupling capacitor is used in the output circuits. A wide band (6V~18V) power supply incorporates circuit breaking and overload protection. Sound signals from left and right tracks are transmitted from (18) and (15) of the integrated circuit N701 for sound acoustic effects processing adjustment through R604, R603/607 and R606, respectively, and coupled to (4) and (12) of the sound power amplifying integrated circuit N601 through C601 and C605, and then both positive and negative signals are transmitted through (1), (2), (14) and (15) after being amplified to directly activate the speaker. Information introducing functions and testing data for TDA7297 maintenance is listed in Table 4. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used.
Table 4 No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Function Right track sound output Right track sound output 15V power supply Right track audio signal input Neutral point Mute signal input Power signal input Grounding Grounding Neutral point Neutral point Left track audio signal input 15V power supply Left track sound output Left track sound output Working Voltage (V) 8.0 8.0 16.0 1.5 0 3.8 4 0 0 0 0 1.5 16.0 8.2 8.2 Grounding Resistance (R) Positive Negative (¦¸) (¦¸) 12.8K 12.7K 12.8K 12.8K ~ 0.94M 86.2K 86.6K ~ ~ 108.8K 107.6K 5.6K 5.6K 0 0 0 0 ~ ~ ~ ~ 86.3K 86.5K ~ 0.94M 12.7K 12.7K 12.7K 12.7K
7. Analysis of field sync and field scan output circuits The field sync signals segregated from compound sync signals are used to activate the field frequency segregation system which commences when a set amount of field sync pulse signals are tested. Of the sync pulse frequencies obtained from segregation, some are transmitted to the field tooth wave generator. The field frequency tooth wave, after
20
geometric processing, is transmitted from (47) and (46) of N201 to (1) and (2) of field output circuit N301. The external resistor R258 (39K ) of N201 (52) provides a reference current to the field tooth wave generator. The external capacitor C233 (104) of (51) forms a capacitor for the field tooth wave. The field output integrated circuit N301 is a complete bridge current drive output circuit, the field deflection coil is installed in the center of the output amplifier. The positive and negative tooth wave signals from (47) and (46) of N201 are input to (1) and (2) of N301, and then output from (9) and (5) after shaping and amplifying in TDA8350Q. R301 (3 K¦¸) transfers input current into voltage, which compares with the voltage generated by the field scan current flowing through R302 (1.5¦¸) and R303 (1.5¦¸) total parallel resistance, and functions as the feedback voltage of TDA8350Q to alter the field output current by altering R301. Power supply for TDA8350Q is realized by dual power sources, and the forward and return power sources are +16.5V and +46V, obtained from the return pulse which is rectified, filtered and then transmitted by the line output transformer T444. Information introducing functions and testing data for TDA8350Q maintenance is listed in Table 4. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used.
Table 5 No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Function Field pumping signal positive input VDP Field pumping signal negative input VDN Feedback Supply voltage Output voltage B Neutral point Grounding Return supply voltage Output voltage A Neutral point E-W correction signal output E-W correction signal input Grounding Working Voltage (V) 2.3 2.2 8.3 16.9 8.2 0 0 48.8 8.6 0.9 11.1 0.73 0 Grounding Resistance (R) Positive Negative (¦¸) (¦¸) 67.0K 67.3K 69.9K 5.9K 6.4M 6.4K ~ 0 32.5K 5.9K ~ 10.4K 62.5K 0 70.3K 5.9K 2.4M 6.1K ~ 0 25.5K 6.1K 4.1M 10.1K 62.9K 0
8. Analysis of line sync and line scan output circuits As the line oscillation circuit is installed inside N201 (TDA8844), external line oscillation components are not necessary while the oscillation frequency is controlled by PH1 tester. Some brightness signals including compound sync signals are transmitted to the internal sync segregation circuits, where line sync and field sync pulses are segregated. The line sync pulse signals are transmitted to PH1 tester which functions to keep oscillation and input signal frequencies synchronic. C249 (472), R255 (15K¦¸) and C241 (lu) connected to N201 (43) are phaselock loop filters. The line oscillation signals corrected by PH1 tester are transmitted to PH2 tester, which functions to stabilize and control the phase positions of output line pumping pulse and to ensure consistent line linearity and
21
centering. The capacitor C238 (103) connected to (42) is for wave filtering of PH2 tester. Line pumping signals are transmitted from (40) of N201 to line promotion triode V402 (KSC2331), and then drive the deflection coil to produce a magnetic field through the triode tube V403 (2SD1887) after being amplified through the switch to control the horizontal scan of the electronicbeam. C414, C415 and C427 are return capacitors, C406 is a line S correction capacitor and L402 is for line linear induction. EW geometric correction signals are transmitted from (45) of N201, input via (12) of N301, output via (11) of N301 after shaping, amplified through triode V401 (KSA614Y), processed by C403 and L401 for wave shaping and then added to the line scan circuits for EW geometric correction. The VD404A and VD404B are modem damping diodes and T444 is a line output transformer. VD408, R416, R256, R257 and C232 form high pressure trace circuits to compensate for the high pressure alteration as a result of brightness changes and to automatically regulate image geometric changes caused by high pressure alterations. R419, R239, DZ205, VD205, R270 and C226 form a beam to restrict the electric circuits. The line return pulse output from (9) and (8) of T444 is rectified and filtered for generating of +16.5V and +46V direct current voltage to (4) and (8) of N301 for forward and return power supply of output integrated circuits. +16.5V is regulated by N401 (KA7812A) to obtain +12V direct current voltage for power supply to some small signal processing circuits, including high frequency tuner TU101 (TECC7949), sound meter SF101(K6265K) and intermediate amplifier N101 (M9911A). (7) outputs 6.3 Vrms filament voltage. (1) provides sync signals to the microprocessor. (5) output return pulse to obtain +180V direct current voltage after rectifying and wave filtering for power supply of video amplifying circuits. 9. Analysis of video amplifying circuits The video amplifying circuits are comprised of integrated circuits N501 (TDA6107) and peripheral components. R, G and B screen display signals output from N901 (23), (24) and (25), and B, G and R primary signals from (19), (20) and (21) of N201 are transmitted to (1), (2) and (3) of N501, respectively. TDA6107 is an amplified integrated video output circuit, including 3 video amplifiers for amplifying the input R, G and B primary signals, and then transmitting the signals to the kinescope cathode through (7), (8) and (9) after amplifying R, G and B primary signals input. (5) of N501 is the dark balance checking output, from which the test results are transmitted to (18) of N201 for adjustment of image dark balance. White balance adjustment is completed through N901 by output of the R, G and B primary signals of N201 under control of an I2C serial bus control system. The components of C504 (4.7u), R504 (10M¦¸) and VD501 (ERC2406) form cutoff bright spot elimination circuits. Information introducing functions and testing data for TDA6107 maintenance is listed in Table 6. Test information is listed beneath VHFL, if a cylindrical color card is installed then a FLUKE 79 III meter is used. (
T a b le 6 Step 1 2 3 4 5 6 7 8 9 F u n c t io n R input G input B input Grounding D a r k c u r re n t te s t o u tp u t Power supply R cathode output G cathode output B cathode output Working V o lt a g e (V ) 3.2 3.0 3.1 0 6.0 182.6 97.6 100.1 93.4 G r o u n d R e s i s ta n c e ( R ) Po sitiv e N e g a t i ve (W ) (W ) 7.6K 7 . 4K 7.6K 7.5K 7.6K 7.4K 0 0 3.1M 2.7M 34.2K 28.2K 1.4M 2.6M 1.4M 2.6M 1.4M 2.6M
22
10. Analysis of switch power circuits The installed switch power source is a typical autonomous pulse switch power source. When the switch is set to on or off, the pulse voltage of the 220V voltage from the transmission line system rectified by VD810 rectifier is filtered by the capacitor C806 (220u) to obtain +300V direct current, which is added to (1) of the power integrated circuits N801 (KA3S0680RFBYDFU inlet) through (1)(4) of the switch transformer T801 (BCK10002). When the appliance is first switched on, the initiating voltage to N801 is supplied by an AC singlephase power source through activating the voltage dividing resistor R803 and R802. When the appliance is operational, voltage is supplied by the rectified pulse generated by (6) (7) of T801 coil. The coupler N802 (PC817C inlet) functions to control voltage, and the voltage tolerance information from the switch transformer T801 is transmitted to (4) of N801 through coupler N802 to regulate the oscillation information of N801. The pulse voltage output from the secondary (8) of the switch transformer T801, rectified and filtered by VD805 (D5L60) and C816 (100u) is +130V direct current voltage which is supplied to the output stage. The pulse voltage output from (13) is rectified and filtered by VD807 (D6L20U) and C820 (2200u) and the resultant +15V direct current voltage is supplied to the sound power amplifying circuits. The pulse voltage output from (11) is rectified and filtered via VD806 (TR5GU41) and C818 (2200u) to obtain +12V direct current voltage to supply the secondary source N804 (KA7630). +8V direct current voltage, output from N804 (8), after rectification of the secondary source, is supplied to the decoder chip. +5V direct current voltage from (9) is supplied to CPU N901 (Wh2000) and capacitor N902 (KS24C08). B. Service mode and adjusting items and datas 1.Factory adjustment information Operation method: after the appliance is switched on, press P.STD, S.STD, CALL and POWER keys on the remote controller to enter the management menu. Press button MENU for selection. Press P+/(CH+/) button to select items for adjustment. Press VOL+/button to adjust selected items. Press 1 6 buttons for quick selection of menus 1 to 6. Press button 9 to select OSD sync signal cathode. Press AV/TV to switch from AV to TV. Press the MUTE button to select or deselect mute. Press the POWER button to switch off the appliance. Press other buttons to deactivate the maintenance menu.
23
If 2.GEOMETRY is selected, a half image or a full image can be displayed in rotation if button 8 is pressed. If 3.PICTURE is selected, a horizontal line can be displayed or removed if button 0 is pressed.
Maintenance menu 1 IF Adjustment (Table 7) Item Specifications Range RF AGC delay Intermediate frequency correction Y delay compensation TV
AGC VCO YDL
0~3FH 0~5 0~8
Default Value 14 02 04
Remark
Not adjustable Not adjustable
VCO 03 corresponds to IF 38.0MHz.
Maintenance menu 2 GEOMETRY (Table 8) Item PSL/NSL PVS/NVS PVA/NVA PHS/NHS PEW/NEW PEP/NEP PEC/NEC PET/NET PSC/NSC Specifications Field pitch correction Field center correction Field range correction Line center correction Line width correction Pincushion correction 4-corner distortion correction Trapezium correction Field S correction Range 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH Default Value Remark
S correction is adjusted according to the curvature of the kinescope, and kinescopes of the same model have the same S correction value. Geometry correction will be automatically classified according to the 50/60 systems currently recognized. Maintenance menu 3 PICTURE (Table 9)
Item RG GG BG SBT SCT SCR STT CDL Specifications R pumping G pumping B pumping Secondary brightness Secondary contrast Secondary chroma N secondary tonality Cathode drive level Range 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~07H Default Value Remark
3A 3A 3A 3A 85
24
Maintenance menu 3 PICTURE (Table 9) Adjustment of acceleration limit: press button 0 to adjust the acceleration limit and a bright line will appear. White balance: Multi audio and video mode degaussing, fixing R pumping, adjusting B and G pumping.
Maintenance menu 4 MULTISET (Table 10) Item MV-R NT-G DY-B SDTB SDBS SDBT SDCT SDCR SDSP SDTT Specifications Movie R raise Natural G raise Dynamic B raise Standard high Standard bass Standard brightness Standard contrast Standard chroma Standard sharpness Standard tincture Range 0~1FH 0~1FH 0~1FH 0~55H 0~41H 0~64H 0~5AH 0~64H 0~64H 0~64H Default Value 07 07 07 32 32 32 5A 32 3C 3C Remark
If the brightness value of the standard picture is set, adjustment of the acceleration limit and white balance in the previous menu must be repeated.
Maintenance menu 5 BOOST (Table 11) Item Specifications Range BT1 BT2 ABS NLA VGM PAK STP COR LWD YDL BLS BKS DS EBS WPO DGR DSK DBL BON Appropriate black-level stretch Nonlinear amplifying Gamma modification Peak value amplitude adjustment Front and rear edge correction Noise reduction adjustment Line width control Y delay fine adjustment 0~0FH 0~1FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~3FH 0~07H
Default Value 04 0F 30 08 0D 26 30 30 15 04
Remark
25
Maintenance menu 6 OPTION (Table 12) Item Specifications Range Default Value 60 A7 Remark Not adjustable Not adjustable
OPTION1 OPTION2 ROWCON Character display vertical 0~1FH position CLMCON Character display horizontal 0~1FH position OPTION3
1B
Not adjustable
Maintenance menu 7 NICAM (Table 13) Item Specifications Range 0~1EH 0~FFH 0~FFH 0~03H 0~0AH Default value 03 14 50 00 08 Remark Not adjustable Not adjustable Not adjustable Not adjustable
LEVEL ADJ Level adjustment LOWER ERROR UP ERROR FILTER Filter band width BAND A2 LEVEL A2 level adjustment ADJ
26
C. Error Detection Process 1. Raster free If +B is normal Abnarmal Check to see if voltage is nomal when W936 is broken. Abnormal None Check to see if CPU voltage is normal. Insoect R933 and R505. Check to see if CRT cathode voltage is normal.
Nomal Inspect bulb filament, video emission and shield grid voltage.
Check to see if shoet circuit of output voltage to ground occurs.
Inspect V403 and T401.
Check to see if R,G anf B signal output available at N201.
Ispect V402 Check to see if 300V is available. Check to see if output available at 40 foot of N201. Inspect TDA6107 and peripheral circuits.
2. Horizontal bright lines Check to see if audio frequency signal output available at 46 and 47 foot of N201.
Available
Not
Check to see if 16V and 47V are normal.
Inspect R258 and C233
Abnormal Inspect R413 and R408.
Inspect N201
Normal Inspect N301 and peripheral circuits.
Inspect T444.
27
3. Failure of remote control Check to see if receiver voltage is normal.
Abnormal Inspect CPU voltage. Inspect N804 base pin.
Normal Inspect receive. Inspect R942 and C921.
Check to see if voltage output available at F802. 4. Screen display Check to see if character polarity of preduction mode is altered. Altered Activate production mode and press button 9 on the remote controller.
Inspect N901.
Normal Check to see synchronistic line and signal input at 26 and 27 foot of N901. No synchronistic field signal No synchronistic line signal Inspect synchronistic line signal input circuits (C407, R407,C913, R934,R935 and V907) Inspect 28 and 29 foot at N901. Inspect synchronistic field signal input circuits (R307, R915,R937 and V908)
Inspect 31 and 32 foot at N901
Check and ,if necessary, replace N901
28
5. Failure of TV sound Check to see if audio frequency signal output available at N201(55) Available Not Check to see if audio intermediate frequency input avaiable at N201(1). Not Inspect L202,, L201 and C204. Inspect Z202, Z203, Z204 and Z205. Inspect N901(5)(6) and (7)(8). Available Inspect N201(56). Check to see if audio frequency signal output at N701(15) and (18). Check to see if audio frequency signal input at N701(3) and (5).
Check and, if necessary, replace N201
Not Check and, if necessary, replace N701.
Available
Inspect N601 and peripheral circuits components.
29
VII. ELECTRICAL ADJUSTMENT
A. Safety precautions 1. It is safe to adjust after using insulating transformer between the power supply line and chassis input to prevent the risk of electric shock and protect the instrument. 2. Never disconnect leads while the TV receiver is on. 3. Don't short any portion of circuits while power is on. 4. The adjustment must be done by the correct appliances. But this is changeable in view of productivity. B. Adjustment procedure The chassis of this TV set uses Philips single chip IC with the latest digital bus processing technology. The adjustment points are fewer and the adjustment is simpler. The adjustment method is as follows: 1. +B: 127V+-0.5V adjustment 1) Switch on the power and connect PAL circular signals to the modulator. 2) Turn the acceleration pole anticlockwise fully. Adjust potentiometer VR701 until the voltage of the main power is 127V+-0.5V. 2. Screen voltage adjustment 1) Switch on the power and receive PAL system circular signal. Warm up the TV set for 15 min. 2) Press factory handset SERVICE button to enter the adjustment status. Press MENU button twice. After the screen displays MENU3, press button 0 and a horizontal bright line appear. Adjust screen potentiometer to let the horizontal bright line just appears. 3. Focus adjustment 1) Receive electronic circular signal 2) Set contrast control to max. 3) Set brightness control to middle 4) Adjust focus potentiometer F1 and F2 until the optimum picture is achieved 4. AGC adjustment 1) Switch on the power and connect signals to the modulator. Receive PAL system color bar signals (strength: 60dB) 2) Connect the negative end of the digital display voltmeter to earth and the positive to TPA of AGC input. 3) Press factory handset button to enter the adjustment status. Press button 6 to adjust AGCTAK, which is usually set to 0B and the measured voltage value is usually 3.85~4.25V. 5. White balance adjustment 1) Close the color intensifying function. 2) Enter the factory picture adjustment status and adjust R, G, and B. 3) Coordinate of reference white color: (X=0.281, Y=0.311) 6. Adjustment of line and frame size 1) Switch on the power and connect the signals to the modulator to receive PAL/NTSC system circular signal. 2) Press factory handset button to enter the adjustment status. Enter GEOMETRY. First adjust PHS/NHS until the horizontal center is at the center of the screen. Then adjust PEW/NEW until the horizontal size is 90~92%. Adjust PSL/NSL, PVS/NVS, PVA/NVA after PSC/NSC until the vertical size is 90~92%. Try to make the electronic circle as round as possible and the vertical center in the center of the screen. 7. Adjustment of pincushion distortion
30
1) Receive grid signal. 2) Press factory handset button to enter the adjustment status. Enter GEOMETRY. First adjust PSC/NSC until the geometrical distortion in the eastwest direction is minimum. Adjust PEC/NEC until the geometrical distortion in the four corners is Minimum. Adjust PET/NET until the upper and bottom keystone distortion is minimum. 8. Adjustment of character positions Adjust ROWCON and CLMCON for the vertical and horizontal positions of the screen menu.
31
VIII. INFORMATION OF RESISTORS AND CAPACITORS
RESISTORS & CAPACITORS PARTS CODE Notes: 1.part numbers are indicated on most mechanical parts. Please use this part number for parts orders. 2.The unit of resistance is ¦¸(ohm).K=1000¦¸,M=1000K¦¸ 3.The unit of capacitance is uF(microfarad). UF=1000PF.
Numbering system of Capacitor Example CL42 ----- 17 ---- 50V ---- 2F4 ---- 104 * ---Z Type Voltage Value(PF) Toleance CL21X ---- 100V ---- 223 * ---J Type Voltage Value(PF) Toleance U CL110X ---- 25V ---- 100¦ÌF ¡À 20% Type Voltage Value Toleance X * 104 =10¡Á104 X 223=22¡Á103
Numbering system of Capacitor Eaxmple RY17S ---2W ---- 390 ---J ---- 05-E-A Type Wattage Value(¦¸) Toleance RS11 ---- 1/2W ---- 1.8K ---- K Type Wattage Value Toleance ABBREVIATION OF PART NAME AND DESCRIPTION RESISTOR
PART NAME & DESCRIPTION
CAPACITOR PART NAME & DESCRIPTION TYPE ALLOWANCE Ceramic J ¡À5% Ceramic K ¡À10% Film L ¡À15% Electroytic M ¡À20% Tantalum P +100%-0% Z +80%-0%
T S J Y F
TYPE Carbon Solid Metal Oxide Fuse
ALLOWANCE F ¡À1% J ¡À5% K ¡À10% M ¡À20% G ¡À2%
C T L D A
32
Terminal view of transistor
B E C
E
CB
B
CE
CB
E
KSR1010TA KSR2010TA SA614-YK
KSC815-YTA KSA539-YTA B CE
C EB
2SD18887YD
BC548-CTA
KSC2331-YTA
33
IV. DAMAGEABLE PARTS LIST
Model:25F99
Circuit di agram N301 V403 N501 N801 C806 L801 R601¡¢R602 R408 F801 F802 TU101 N901 Name of part IC TRANSISTOR IC IC CAPACITOR POWER FILTER FUSE RESISTOR FUSE RESISTOR FUSE FUSE TUNER IC PACKAGING Part specialized code 0094400185 0094400184 0094400186 0094400189 0094200132 0094500031 0094101529 0094100122 0094000012 0094000013 0094000014 0094400781 QTY. 1 1 1 1 1 1 2 1 1 1 1 1 1 remark
34
X. SYSTEM BLOCK DIAGRAM
AV IN N701 SOUND PROCESSOR L-OUT R-OUT N601 SOUND AMPLIFIER AV OUT SPEAKER
ANTENNA
Tu101 TURNER IF Sf101 K9260M
BLACK CURENT STEAM
VT
L
H
U
KEY BOARD
SCL
CRT N201 SMALL SIGNAL PROCESSOR G B
SDA
N901 CPU
R N501 VIDEO AMPLIFIER
Rm901 REMOTE RECEIVER
SCL CVBS
SDA VP VN SIF FILTER N301 FIELD OUTPUT
N902 ROM
+5V------NICAM
POWER
RESET H-DRIVE SIF TRAP V403 LINE OUTPUT
N805 KA78R05
N804 Ka7630
+5V +8V
+12.7V
AC
SWITCH POWER SYSTEM
V-SYNC H-SYNC
HV-PROTECTION
T444 LINE OUTPUT TRANSFER
35
1
GND
BUS STOP
TIM
REM
GND
5V
SIG
CN902 SCL SDA B+
Circuits diagram
CN904 K S 24 N 902 C 08 4 VSS SDA A2 A1 A0 VCC 8 DZ905 MTZ5.1B
SDA
H S 901 R M 0038A
3
1 R903 10K 5 R954 100
SCL SDA
2 R953 100
R943 47
C922 100u C903 104 C902 152 R942 4.7K 2 1 SDA 41 40 L906 10uH
SCL
A1-33V
DZ901 KA33V R946 100 C923 104 C924 10u R949 100 R952 100 R904 10K C905 104 1 VT UHF VHF-H VHF-L B/G D/K I M KEY-IN1 KEY-IN2 XATL2 31 30 29 28 GND Vsync 27 V907 KSA815-Y Hsync 26 OSD/FB 25 24 OSD-R 23 POWER BCF 21 . A O F LB P O R T LM K H OSD-B OSD-G 22 R930 330 R929 47 R928 47 R927 100 L928 C914 27uH 27 C915 22 W920 4.7K R934 10K C913 821
H-SYNC
C904 10u
3
VT
R906 11K R901 10K 42 V901 KSC815-Y 2 SCL 3 AV1/AV2 4 V903 KSR1010 5 BUS-STOP 37 36 C921 102 R945 R948 4.7K 2.2K R951 2.2K 6 7 REMOCDN BASS 35 VCC 33 X901 C917 32 7.3MHz 15 C916 15 V908 KSA815-Y L904 68uH
RESET
SW901 MENU R902 10K C901 151
R910 820
C906 104
R905 10K
L901 0.47uH
N901 WH2000
L905 10uH
SCL 6 WP 7
UHF
C927 104 V902 KSC815 Y/C ON/OFF 39 38 R944 100 C907 104
VHF-H
AV1/AV2
SW902 VOL-DOWN C908 104
R911 1.5K
C926 104
Y/C
VHF-L
C925 104 C909 104
V904 KSR1010
BASS
SW903 VOL-UP 8 R909 2.7K R908 1.5K 9 10 RESETER(GND) 11 12 PAL/NT GND(RESET) RELAY AFB HOLD-IN MUTE TIMER S-BT/REM LOOP AGND XTAL1 R916 10K 13 14 15 R919 10K 17 R925 680 18 R926 680 19 W936 430 R922 1K 20 R956 4.7K R918 4.7K 16 DZ902 MTZ5.1B 34 R913 1.5K R914 2.7K
R912 2.7K
B/G D/K PAL-I NTSC-M
C919 104
C920 10u
SW904 CH-DOWN C910 102 C911 102
PAL/NT
C918 102 RT16 4.7K R915 10K VD907 IN4148 R937 4.7K C928 4700
V-SYNC
R823 10
DZ903 MTZ6.2C
A3-12.7V
R917 1K
SW905 CH-UP
R960 820
DZ904 MTZ9.1B
C912 0.47u
R955 1K
R961 1.5K
MUTE
VD901 IN4148
R920 100K
R921 10K
SW906 TV/AV
R923 10K
V905 KSC815-Y
VD906 IN414B
R935 4.7K VD904 IN4148
OSD-R
VD903 IN4148
OSD-G
HTRYG9208
POWER
LD901
VD902 IN4148
OSD-B
BCF
L903 5.6uH V906 KSA539 CW901 101 4
VD905 IN4148
OSD-F/B EXT-BUS
A7-5.1V
R924 4.7K
R931 270
IF-BUS A6-8V IIC-BUS OSD-BUS B+-LINE POWER-BUS
36
B9-12V
R101 24
V-OUT
2
VDP VDN X -R AY E W -D R I H -D R I
POW-BUS ABL
A6-8V H -S Y N C
N101 M9911A
R248 47 C240 47u V210 KSC815-Y L205 10uH C235 151 R252 8.2K
A6-8V
C108 47u
IF-1
IF-2
1 V211 KSC815-Y R256 75K C238 103 R253 3.3K
2
3 4
L101
DZ101 6 MTZ9.1B
C109 103
PAL/NTSC
A-OUT
1.2uH
L102 10uH R259 100 C220 100u C236 472 C242 222 C234 224 2.1 49 IF 1
2ND LOOP OUT +H O R .
R262 9.1K R266 1K C229 473 X202 X203 4.43MHz3.579MHz C228 16 C227 20 R257 33K L208 1uH L207 1uH L206 1uH C232 104
VD217 IN4148
R261 12K
R260 9.1K
L103 10uH C241 1u R255 15K C230 102 3.5 37 VCC
PAL/NTSC/SECAM DECODER HUE H/V DIVIDER VCO+CONTROL REF THRO CR AP M A +BANDPASS T U IR F I NEN G LT BLACK IDENT SW I DNT V IE E O D AFC DANT C OC ' R O L S SW CVBS-SWITCH RGB CONTROL+OUTPUT IIC-BUS TRANSCEIVOR CVBS-Y/C SWITCH D E LAY F LU M A PEAKING CORING PRE-AMP +HUTE M D TE VI EO U MUTE AFC PLL DEMOD VERT-SYNC SEPARATOR REF
R110 51 R209C231 68K 222 C239 472 R251 100 R250 10 R249 1K R247 100 C245 104 R246 100K
TU101 TECC7949
VT
IF
AFT
B+
V-L
V-H
U
VT
AGC
UHF
VHF-H
C237 C244 10u 223
C243 R258 1u 39K
C233 104
VHF-L
56 AGC 2
TOP AGC FOR IF +TUNER VERTICAL GEOMETRY EW-GEOMETRY SYN C EP LO O P + 1S T POL AU D I FI R M P LI E O VOL SWITCH VOLUME SW
3.9 55 EHT IF GND CVBS 54 53 52 51 50 48 47 46 45 44 43 42 41 40 39 H-OUT 38 36
3.0
3.7
3.1
3.9
3.8
4.1
4.1
2.4
2.3
0.0
0.0
3.9
4.6
0.5
0.4
4.0
8.0
4.9
35
2.6
34
2.6
33
1.6
32
4.0 V
31
4.0 U
CD MATRIX SAT CONTROL STR E B LU E T C H SKIN TINY CORR
30
SAT
1.8 V
29
1.8 U
DZ102 MTZ5.1B
C101 0.22u
C102 220u
C103 104
C104 104
C105 104
C106 0.33u
C107 22u
N201 TDA8844
R102 2.2K
R103 2.7K
SF101 K6264K
A6-8V
BASE-BAND LI E D E LAY N
1
8
7
C110 102
4
IF-1
10
C O NHTON O U S AT ID E CALIBRATION WHITE P1 BRIGHT CONTROL STR ET B LA C K C H RGB MATRIX I PU T R G B1 N
VD101 BAW75
LIMITER VIF AMPLIFIER +PLL DEMOD
R104 560 SIF 1 0.0 C213 223 R222 1 C217 104 C214 2.2u 2 3.9 3 3.6 4 3.6 5 2.8 SCL SDA 6 3.2 7 5.0 8 5.0 C216 100u
2
5
IF-2
3
6
R105 56K
PAL/NTSC
V101 BC548C
C111 104
VD102 IN4148
VCC GND AUDIO B G R BEAM R1 G1 B1 BL1 Y Y 9 6.6 10 0.0 11 3.4 12 7.9 13 3.8 14 0.0 15 3.4 16 3.7 17 3.4 18 6.6 19 2.1 20 2.2 21 2.1 22 3.2 23 3.4 24 3.4 25 3.4 26 0.4 27 1.6 28 R230 12K C221 224
MTZ9.1B
AUDIO-IN
C209 102 R212 390 C210 104 R220 100 R221 100
R233 100 DZ201 DZ204
R234 100
R235 100
C223 104 C255 104
MTZ9.1B
C224 104
C225 104
R242 330
SDA
SCL
VD103
V202 KSC815-Y
R203 4.7K
Z202 4.5M
C205 101
VD201 IN4148
R211 1K
IN4148 R215 75 R213 470 C211 47u V204 KSC815-Y R219 100 Z210 5.5MHz R218 200 Z208 5.5/6.0/6.5MHz L204 5.6uH Z207 4.5MHz R216 510 R217 180 L203 10uH V205 KSR2010 V203 KSC815-Y R214 47
C204 101
Z203 6.0M
R204 4.7K
C206 101
VD202 IN4148 R223 3.9M C218 474 C215 474 R225 430 R224 470
KSC815-Y
L201 22uH
L202 10uH
R202 510
Z204 6.5M
C207 101
VD203 IN4148
R210 4.7K
R226 47
C208 101
VD204 IN4148
C212 102
C219 47u
C222 474
R270 6.8K C226 4.7u
DZ205 VD205 MTZ3.9B R239 IN4148 20K R416 270K V207 VD408 IN4148 DZ420 MTZ4.7B
Z205 5.5M
V201 KSC815-Y
R205 1K
R208 1K
R206 1K
B/G
CVBS
V 1-IN
V 2-IN
O S D -R
O S D -G
O S D -B
TTX -R
TTX -G
TTX -B
21P -R
21P -G
21P -B
R -O U T
G -O U T SO UND
C -S V H S
NTSC-M
V206 KSR1010
IIC-BUS
OSD-BUS
EXT-BUS
IF-BUS
CRT-BUS
PA L/N TS C
C U T-O FF R F-O U T 21P -F/B B -O U T
R263 1K
O S D -F/B
207 1K
D/K
PAL-I
Z209 5.5/6.0/6.5MHz
R714 1K
R241 C256 1K 82
37
3
PROTECTION
N804 KA7630 N301
L301 10uH R305 R306 C305 390 220 104 V1 L302 10uH V2 C406 434 VD401 TR5GU41 C405 2.2u H2 R301 3K C304 104 C303 68u DZ303 MTZ16C DZ302 MTZJ30D R403 5.6K R405 390 C402 103 R401 52.6K R304 33K R406 18K R303 1.5
VDP
TDA8350Q
A M P LI IS T E A S T WFEE R
REFERENCE
VERTICAL
RESET O UT3 O UT2 O UT1
D I A B LE S
+
10 INPUT INPUT FEEDBACK VP 1 2 3 4 5 2.3V 2.3V 8.5V 17.3V 8.4
VFLYBACK OUTPUT OUTPUT
8 8.0V 9 5.1V NC 6 8 47V 9 8.7V 10 11 13V 12 13 0.7V GND 7 NC C833 47u R302 1.5
C828 220u NC C832 100u
2 12.0V C830 1u 6 7
C829
DZ807 5.6B
10u
R822 10K
R820 1 DZ803 5.6B
A 6-8V RESET A 7-5.1V
R821 1
VD810 1N4148
I PUT N
1 9.3V
I PUT N
3 3.0V
4 4.5V
5 0.0V
+
H1 C302 100u DZ301 MTZ22A R402 100 V401
KSA614Y
C831 10u C301 474
VDN
A 3-12.7V
A 3-12.7V
PO W ER
L402 AC0032TL
C404 102 L401 1mH
B+
LINE
POWER-BUS
EW-DRI
C403 22u W317 1N4148 R407 3.9K DZ401 MTZJ30D
C407 681 C409 471
CN801
A1-33V
SW801 5A-250V R408 10 R307 C306 MTZ16C 102 L303 10uH
V-SYNC
C813 472 R811 7.5K
H-SYNC
C812 472 R810 10K DZ402 MTZ5.1B
F8014A/250V DZ304 MTZJ30D
A2-130V
R808 3.3M
R809 4.7M
VD407 ER24-06
C408 472
T444 BSC28-5314E
TO HV
CRT HV
C801 104 C814 561 L805 5.1
L304 33uH C410 68u DZ306 MTZJ30D VD405 R5GU41 N401 KA7812 R414 10
FO
R801 3.3M C816 4.7u 1 C817 561 C815 220u VD402 IN4004
A3-12.7V A3-12.7V
DV801 MYN15-471K VD805 D5L60
B9-12V
8 46V 16.5V 9 6 C421 100u C422 C426 104 100u C420 224 R413 0.27 HEATER 7 1 FO
SC
T801 BCK-100-02 8 L804 F/B
R803 33K
N801
4 10 11 VD806 TR5GU41 C818 2200 6 12 13 7 C519 561 C820 2200u
A2-130V A4-15V
L807 4
L803
9 15
VD403 IN4004
VFB
C419 470u
C418 471 VD404 C414 FMP-3FU 472 C412 561 R411 110 V403 2SD1887 T401 R415 0.39 C415 752
H-OUT 4 6
VIDEO
L801
1 F/B
F/B
CN802
2
SC 3 B+
VCC SYNC 3 5 VD807 D6L20U L806 F/B L808 F/B
C807 102
R802 33K
R806 8.2K
C811 101
VD804 IN4148
H-DRI
C413 100u C411 103
R807 MTZJ6.8C
R427 33
C416 153
R415 0.47
TVR10G
VD406
10 C423 471 C424 22u R417 91K
H E ATE R 180V
11 R419 1K
VD802 B1206 14
VD803 ERB4304
C425 104 R418 91K R817 33K
VD810 D5SB60
R813 1.5K C821 102 R815 127K R824 300K
C808 33u
+
R814 1K
1
N802 PCT817C
ABL
GT404
2
C804 222
CRT-BUS POWER-BUS
~
RP801 5
R804 470K
~
3
4
C805 222 DZ805 KA431
C806 220u
R805 470K
C809 223 R816 2.64K
F & SCC PRR CO B U S TO T E E N R410 270
RP803 PTC
V402 KSC2331-Y
38
AOL AOR
4
JS702
AV1-AL AV1-AR AOL V2-IN V-OUT
CRT-BUS
EXT-BUS
L708 10uH L707 10uH R725 75 OUT AV2-IN VIDEO R503 1.8K R501 1.8K R502 1.8K
SDA
1T GP 501
C503 103 SC
IIC-BUS
IF-BUS AV2-AR AV2-AL AV2-AL AV2-AR
1T GP 502 FO HV
B+LINE
L703 10uH L704 10uH R715 75 L R AUDIO R740 100 C717 562
SDA V03
R708 220 R707 220 R706 100 R703 220 R704 220
R731 10K C718 333 R729 100 22
CBL1 CBL2 VO7 CTL VO3
C705 224
C725 C727 224 224
C723 153
C722 224
C721 153
C720 10
R730 1K 21 20 19 18 17
C719 10u
32
31
30
29
28
27
26
25
24
23
VI4
P2
VO2
CPS1
VI1
CPS2
VO5
MAD
VO1
VI7
N701 TDA9859
C507 391 C508 391 C509 391
CRT 73X707Y22-DC01
MULTIPLE SOURCE AND MODE SELECTION B ACRR O S S SWITCH
HEADPHONE CHANNEL VOLUME IIC-BUS CONTROL
CN503
HUE TREBLE CONTROL CBR1 CBR2 VO6 CTR VO4 SCL VOLUME BALANCE
REFERENCE VOLTAGE
VOLUME CONTROL
STEREO SPATIAL STEREO PSEUDO STEREO FORCEO MONC
BASS CONTROL
R-OUT
R507 100 1 3.0 V1 R508 100 2 3.0 R509 100 3.0 1 2 3 4 4 DZ504 DZ503 DZ502 MTZ9.1B MTZ9.1B MTZ9.1B R505 2.4 DZ501 MTZ9.1B R510 100 R626 68 R512 100 R511 100 5 6 7 8 CN501
N501 TDA6107Q
R504 10M V2 3
1 2 3 4
VI3
P1
VI5
CSMO
VI6
VP
VO5
GND
VO2
VI2
G-OUT B-OUT
1 C713 333 R728 100
CUT-OFF SCL
2
3
4
5
6
7
8
9
11
12
13
15
16
C707 100u
C711 10u
V3 G ND
R726 1K
10 C712 10u
14 C714 562
1
C504 4.7u 6.0
L709 10uH 5 1 2
180V
A6-8V
R727 10K R741 R705 100
AOR
2
178.5 111 116 114 5 6 VD501 ERC24-06
C706 224
V04
C710 100u 100
HEATER
C709 104
3
VDD 7 PROBE3 8 PROBE2 9 PROBE1
A-OUT
A 4-15V
3 CN502
R602 0.18
VCC1 OUT1
+
+
VD502 VD503 VD504 ERB4304 ERB4304 ERB4304
ST-BY 4 3 C601 1u 2 1
IN2
MONO
IN1 C502 222 C506 10u R527 33K
OUT2
VCC2
SVR
IN-MUTE
GND
MUTE2
MUTE1
15
14
13
R601 0.18
C-SVHS
N601B TDA7297
R604 6.2K
V04 V03 AV1-AL AV1-AR V1-IN
12 C605 1u
11
10
9
8
7
6
5
CN201 R