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LCD TV SERVICE MANUAL
CHASSIS : LP78A
MODEL : 26LC41/4R 26LC41/4R-ZA MODEL : 26LC42 26LC42-ZC
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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CONTENTS
CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ..........................................................................3 SPECIFICATION ........................................................................................6 ADJUSTMENT INSTRUCTION .................................................................9 TROUBLE SHOOTING ............................................................................17 BLOCK DIAGRAM...................................................................................25 EXPLODED VIEW .................................................................................. 26 EXPLODED VIEW PARTS LIST ..............................................................27 REPLACEMENT PARTS LIST ............................................................... 28 SVC. SHEET ...............................................................................................
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SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by 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 Shock, Fire, or other Hazards. Do not modify the original design without permission of 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 resulting in personal injury from electrical shocks. It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified. 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.
Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check. Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer.
Leakage Current Hot Check circuit
AC Volt-meter
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 be sure the set is safe to operate without damage of electrical shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1M and 5.2M. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer.
To Instrument's exposed METALLIC PARTS
Good Earth Ground such as WATER PIPE, CONDUIT etc.
0.15uF
1.5 Kohm/10W
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SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, 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 receiver assembly. 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 part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc". 3. Do not spray chemicals on or near this receiver or any of its assemblies. 4. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-abrasive 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 in not required. 5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped. 6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 7. 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. 8. 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 commonly are 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 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 reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static type solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled 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 harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can 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 or 500°F to 600°F. 2. Use an appropriate gauge of RMA resin-core 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 wirebristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners. 5. Use the following unsoldering technique a. Allow the soldering iron tip to reach normal temperature. (500°F to 600°F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suctiontype solder removal device or with solder braid. CAUTION: Work quickly to avoid overheating the circuit board printed foil. 6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature (500°F to 600°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 wire-bristle brush.
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IC 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 the 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 in paragraphs 5 and 6 above. Removal 1. 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. 2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC. Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas). "Small-Signal" Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close as possible to the component body. 2. Bend into a "U" shape the end of each of three leads remaining on the circuit board. 3. Bend into a "U" shape the replacement transistor leads. 4. 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 1. Heat and remove all solder from around the transistor leads. 2. Remove the heat sink mounting screw (if so equipped). 3. Carefully remove the transistor from the heat sink of the circuit board. 4. Insert new transistor in the circuit board. 5. Solder each transistor lead, and clip off excess lead. 6. Replace heat sink. Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicular y to the circuit board. 3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. 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 the foil to the circuit board causing the foil to separate from or "lift-off" 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. 4. Route the jumper wire along the path of the out-away 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 ensure 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 20-gauge 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 the it does not touch components or sharp edges.
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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This specification is applied to LP78A chassis.
2. Requirement for Test
Testing for standard of each part must be followed in below condition. (1) Temperature : 25 ± 5°C(77 ± 9°F), CST : 40 ± 5°C (2) Humidity : 65% ± 10% (3) Power : Standard input voltage (100-240V~, 50/60Hz) *Standard Voltage of each products is marked by models
(4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM. (5) The receiver must be operated for about 20 minutes prior to the adjustment.
3. Test method
3.1 Performance : LGE TV test method followed 3.2 Demanded other specification Safety : CE, IEC Specification EMC : CE, IEC
4. General Specification(LCD Module)
Item Display Screen Device Aspect Ratio LCD Module Operating Environment Storage Environment Input Voltage Specification 26/27/32/37/42" wide Color Display Module 16:9 26/27/32/37/42" TFT WXGA LCD Temp. : 0 ~ 40 deg, Humidity : 0 ~ 85% Temp. : -20 ~ 60 deg, Humidity : 0 ~ 85 % 100-240V~, 50/60Hz Power on (Green) Power Consumption TBD max St-By (Red) : 1.0 W LCD Module AUO Outline Dimension 26" 32" 37" Pixel Pitch 26" 32" 37" Back Light 26",32" 37" CMO Outline Dimension 27" 32" Pixel Pitch 27" 32" Back Light 27" 32" LPL Outline Dimension 26" 32" 37" 42" Pixel Pitch 26" 32" 37" 42" Back Light 26" 32" 37" 42" Display Colors Coating 626.0 x 373.0 x 47.5 760.0 x 450.0 x 45 877.0 x 514.6 x 54.7 0.4215 0.51075 0.6 x 0.6 8 U-lamp 10 U-lamp 637.55 x 379.8 x 40.7 760 x 450 x 47.53 0.1455 x 0.4365 0.1730 x 0.5190 14 CCFL 16 CCFL 626 x 373 x 44.1 760.0 x 450.0 x 48.0 877.0 x 516.8 x 55.5 1006 x 610 x 56 0.1405 x 0.4215 0.17025 x 0.51075 0.200 x 0.600 0.227 x 0.681 18 EEFL (17 EEFL) 18 EEFL 20 EEFL 20 CCFL 16.7M (16,777,216) 3H, AG (LPL 26") (LC260WX2-SLB3) mm mm (H) x (V) x (D) [with inverter] (H) x (V) mm (H) x (V) mm (H) x (V) x (D) [with inverter] (H) x (W) mm mm mm mm (H) x (V) x (D) [with inverter] (42") (26", 27", 32", 37") Volume: 1/8 volume of sound distortion point MAKER : AUO/CMO/LPL/CPT LGE SPEC Measurement Result LCD Remark
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5. Model Specification(EU)
Item Market Broadcasting system Available Channel EU PAL BG/DK, PAL I/II, SECAM L/L' BAND VHF/UHF CATV Receiving system SCART Input(2EA) Video Input (1EA) S-Video Input (1EA) Component Input (1EA) RGB Input (1EA) HDMI Input (2EA) Audio Input (4EA) Variable Audio out(1EA) Upper Heterodyne PAL, SECAM, NTSC PAL, SECAM, NTSC PAL, SECAM, NTSC Y/Cb/Cr, Y/ Pb/Pr RGB-PC HDMI-DTV PC Audio, AV (3A), Component (1EA) L/R Input(PC 1EA,SCART 2EA, SIDE AV 1EA, Component 1EA) Full Scart 1EA, Harf 1EA Side AV Side AV S-Video Priority PAL C1_C69 S1_S47 Specification Remark
6. Component Video Input (Y, PB, PR)
Resolution 720*480 720*480 720*576 720*480 720*480 720*576 1280*720 1280*720 1280*720 1920*1080 1920*1080 1920*1080 H-freq(kHz) 15.73 15.75 15.625 31.47 31.50 31.25 44.96 45.00 37.50 33.72 33.75 28.125 V-freq(kHz) 59.94 60.00 50.00 59.94 60.00 50.00 59.94 60.00 50.00 59.94 60.00 50.00 Pixel clock(MHz) 13.500 13.514 13.500 27.000 27.027 27.000 74.176 74.250 74.25 74.176 74.250 74.250 Proposed SDTV, DVD 480I(525I) SDTV, DVD 480I(525I) SDTV, DVD 576I(625I) 50Hz SDTV 480P SDTV 480P SDTV 576P 50Hz HDTV 720P HDTV 720P HDTV 720P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz
7. RGB Input (Analog PC)
Resolution 640*350 720*400 640*480 800*600 1024*768 1280*768 1360*768 1366*768 H-freq(kHz) 31.468 31.469 31.469 37.879 48.363 47.776 47.720 47.720 V-freq(kHz) 70.80 70.80 59.94 60.31 60.00 59.87 59.799 59.799 Pixel clock(MHz) 25.17 28.321 25.17 40.00 65.00 79.50 84.75 84.75 Proposed EGA DOS VESA(VGA) VESA(SVGA) VESA(XGA) WXGA WXGA WXGA XGA only XGA only XGA only Remark
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8. HDMI input (DTV)
Resolution 720*480 720*480 720*576 720*480 720*480 720*576 1280*720 1280*720 1280*720 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 H-freq(kHz) 15.75 15.73 15.625 31.47 31.50 31.25 44.96 45.00 37.50 33.72 33.75 28.125 67.432 67.5 56.250 V-freq(kHz) 60.00 59.94 50.00 59.94 60.00 50.00 59.94 60.00 50.00 59.94 60.00 50.00 59.94 60 50 Pixel clock(MHz) 13.514 13.500 13.500 27.000 27.027 27.000 74.176 74.250 74.25 74.176 74.250 74.250 148.350 148.5 148.5 Proposed SDTV, DVD 480I(525I) SDTV, DVD 480I(525I) SDTV, DVD 576I(625I) 50Hz SDTV 480P SDTV 480P SDTV 576P 50Hz HDTV 720P HDTV 720P HDTV 720P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz HDTV 1080P HDTV 1080P HDTV 1080P 50Hz
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ADJUSTMENT INSTRUCTION
1. Application Range
This spec sheet is applied all of the 26/32/37/42" LCD TV(LP78A) by manufacturing LG TV Plant all over the world. LPT Port Driver (LptDrv) Setups : Program Files > Micronas > Visual I2C > Port_Driver *Use for Windows 95/98 : Setup_LptDrv_v0104_9x.exe *Use for Windows 2000/XP : Setup_LptDrv_v0202_XP_2000.exe *Use for Windows NT : Setup_LptDrv_v0104_NT.exe (3) Verification (Start > Programs > Micronas > Visual I2C or LptDrv)
2. Specification
1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test instrument. 2) Adjustment must be done in the correct order. 3) The adjustment must be performed in the circumstance of 25±5°C of temperature and 65±10% of relative humidity if there is no specific designation. 4) The input voltage of the receiver must keep 100~220V, 50/60Hz. 5) Before adjustment, execute Heat-Run for 30 minutes at RF no signal.
3. Adjustment items
3.1. PCB assembly adjustment items
1) Download the VCTP main software (IC500,VCT_Pro) 2) Channel memory (IC501,EEPROM) 3) Color carrier Adjustment
(4) LPT delay setting(File > Preference > LPT preferences)
3.2. SET assembly adjustment items
1) DDC Data input. 2) Adjustment of White Balance. 3) Factoring Option Data input. *LPT SETTING - Delay => 1 - Time out => 500 ms
4. PCB assembly adjustment method
(Using VCTP Download program)
(5) Exchange the bootloader.bat file.
4.1. Download program installation
(1) Extract a Zip file
(2) Visual I2C & LPT Driver Installation
Install the LPT Driver Install the Visual I2C
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3) Double click the blue box and confirm "Bootloader Version" as 42.
4) Click the "Erase Flash" button
=> Select the "Bootloader.bat" file(install > VCTP_download > Bootloader) => Push "OK"
5) Double click the download file low, then "edit" window will be opened
=> Finish the program, after saving the file "download_cs.vi2c" (if you click x , the massage appears automatically)
4.2. S/W program download
(1) Download method 1 (PCB Ass'y)
6) Click the choice button in the "edit window", then "file choice window" will be opened.
1) Connect the download jig to D-sub jack 2) Execute `Download.vi2c' program in PC, then a main window will be opened
7) Choose the Hex file in folder and execute downloading with click " open" button.
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8) Click OK button at the "edit window". 9) Under Downloading process
4) Execute `Download.vi2c' program in PC, then a main widow will be opened.
10) If download is failed, for example "No acknowledge from slave". Execute download again from(1).
(2) Download method 2 (AV Plate Ass'y)
5) Double click the blue box and confirm "Bootloader Version" as 42.
1) Push S/W `ON" (connect SCL to GND using switch at Jig ) and connect the download jig to D-sub jack.
6) Click the "Erase Flash" button.
Push S/W 2) Supply the power (Stand-by 5V) and wait for 3 seconds. 7) Double click the download file low then, "edit" window will be opened.
8) Chick the choice button I n the "edit window", then "file choice window' will be opened.
3) Push the S/W off (Disconnect SCL to GND using switch at jig).
Push S/W
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9) Choose the Hex file in folder and execute downloading with click "open button".
2) Connect Zig to TV using a D-sub cable.
10) Click OK button at the "edit window"
3) Execute `Download_CS.vi2c' program in PC, then a main widow will be opened.
4) Click "GO" button.
11) Under Downloading progress. If you don't push the "go", the Hex file would not be downloaded although the download proceeds normally at first glance. 5) Double click the blue box and confirm "Bootloader Version" as 42.
12) If download is failed, for example "No acknowledge from slave", execute download again from (1).
6) Click the "Erase Flash" button
(3) Download method 3 (SET)
1) Push the "Tilt" button in an Adjust Remocon Then the LCD TV will change a "slave mode".
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7) Double click the download file low then, "edit" window will be opened.
12) If download is failed, for example "No acknowledge from slave", execute download again from (1).
8) Chick the choice button I n the "edit window", then "file choice window' will be opened
4.3. Channel memory download
(1) Connect the download jig to D-sub jack. (2) Execute `Channel.vi2c' program in PC, then a main window will be opened.
(3) Push the button change and select the Channel memory data. 9) Choose the Hex file in folder and execute downloading with click "open button"
10) Click OK button at the "edit window" (4) Check the communication is OK or not. => Push the Read area (Ackn. Check) and check Cyan area is OK message.
11) Downloading
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(5) Push the Update NVM from File
5. EDID(The Extended Display Identification Data ) /DDC(Display Data Channel) download
* Caution - Use the proper signal cable for EDID Download. - Never connect HDMI & D-SUB Cable at the same time. - Use the proper cables below for EDID Writing. For RGB EDID For HDMI EDID
4.4. Tool Option Area Option Change
Before PCB check, have to change the Tool option and Area option Option values are below (If on changed the option, the input menu can differ the model spec.) The input methods are same as other chassises(Use adj Key on the Adjust Remocon) Tool Option Inch 26 32 37 42 Area Option ZA 02240 02256 02264 02272 Depend on PR TA 04288 04304 04312 04320 * EDID Data Item Manufacturer ID Version Revision Condition GSM Digital : 1 Digital :3 01 03 Data 1E6D
4.5. Color carrier Adjustment (Inspection process)
(1) Tuning the RF signal ZA, TA : PAL Philips Pattern(with color Bar) MA : NTSC Digital Pattern(with color Bar)
< EDID DATA HDMI Set : 256bytes>
(2) push the "adj" key in the adjustment remocon.
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=> Detail EDID Options are below(a, b, c, d, e) a. Product ID
b. Serial No : Controlled on production line c. Month, Year : Controlled on production line ex) Monthly: '03' => '03' Year: '2005' => '0F' d. Model Name(Hex):
Model Name 32LC4R-ZA 42LC4R-ZA
00 00 00 00 00 00 FC FC 00 00 33 34 32 32
6. Adjustment of White Balance
5A 5A 41 41 0A 0A 20 20 20 20
Model Name(HEX)
4C 4C 43 43 34 34 52 52 2D 2D
6.1 Required Equipment
(1) Remote control for adjustment (2) Color Analyzer (CA-110 or CA-210 or same product) (3) Auto W/B adjustment instrument(only for Auto adjustment)
e. Checksum (7EH) : Changeable by total EDID data
5.1. Sequence of Adjustment
(1) DDC data of Analog-RGB 1) Init the data
6.2 Connecting diagram of equipment for measuring (For Automatic Adjustment)
2) Load the EDID data. (Open file) [Analog - RGB : LP78A_RGB.ANA] [Digital - HDMI : LP78A_HDMI.DVI] 3)Set the S/W as below
(1) Enter the DDC adjust mode - Enter the DDC adjust mode at the same time heat-run mode when pushing the power on by power only key - Enter the adjust mode and change the input mode to AV (ZA : AV3, TA,MA : AV2)when pushing the Front av key - Maintain the DDC adjust mode with same condition of Heat-run -> Maintain after AC off/on in status of Heat-run pattern display (2) Release the DDC adjust mode - Release the adjust mode after AC off/on or std-by off/on in status of finishing the Hear-run mode - Release the Adjust mode when receiving the aging off command(F3 00 00) from adjustment equipment - Need to transmit the aging off command to TV set after finishing the adjustment.)
4) Push the "Write Data & Verify"button. And confirm "Yes". 5) If the writing is finished, you will see the "OK" message.
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(3) DDC adjustment support command set Adjustment Aging On/Off Input select CMD(HEX) F3 F4 ADR 00 00 FF : ON / OO : OFF 0x10 : TV 0x20 : AV1(SCART1) 0x21 : AV2(SCART2) 0x23 : AV3(Side AV) 0x40 : Component1 0x50 : RGB DTV 0x60 : RGB PC 0x90 : HDMI1 DTV R GAIN G GAIN B GAIN 16 18 1A 00 00 00 GAIN adjustment
6.4 Input the Shipping Option Data
1) Push the ADJ key in a Adjust Remote control. 2) Input the Option Number that was specified in the BOM, into the Shipping area. 3) The work is finished, Push A Key.
7. Default Value in Adjustment mode
(Default values maybe modified the module condition)
7.1. White Balance
6.3. Adjustment of White Balance
(For Manual adjustment) - Operate the zero-calibration of the CA-110 or CA-210, then stick sensor to LCD module when you adjust. - For manual adjustment, it is also possible by the following sequence 1) Select RF no signal by pressing "POWER ON" key on remote control for adjustment then operate heat run more than 15 minutes. (If not executed this step, the condition for W/B will be differ. The W/B condition is Picture Mode : Standard (MA : Optimum), Color Temp : Normal. ) 2) Changing to the av mode by pushing the input or front av key. 3) Display the internal pattern of the VCT-Pro IC by pushing the IN-START. 4) Stick sensor to center of the screen and select each items (Red/Green/Blue Gain and Offset) using D / E (CH+/-) key on R/C. 5) Adjust R Gain / B Gain using F/G (VOL+/-) key on R/C. 6) Adjust it until color coordination becomes as below. (Initially, R/G/B gain and R/G/B offset values are fixed as below) Red Gain : 80 , Green Gain : 80 , Blue Gain : 80 Red Offset : 80, Green Offset : 80 , Blue Offset : 80 * Target Value [Picture Mode : Standard (ZA, TA), Optimum(MA), Color Temp: Normal] -Normal (9300K) x ; 0.283±0.003 y ; 0.298±0.003 -Luminance(Y) AV : upper 150 cd/m2 (Typ : 350 cd/m2) => Reference Value(Automatically fixed) - Cool(11000K): x:0.274±0.003, y: 0.286±0.003 - Warm(7200K) : x:0.303±0.003, y: 0.319±0.003
8. Internal press test
Item Dielectric Voltage (AC <-> FG) Value 1.5 Unit kV Remark At 100mA for 1sec (Line) At 100mA for 1min (OQC) Dielectric Voltage (Without FG) 3 kV At 100mA for 1sec (Line) At 100mA for 1min (OQC)
9. Sound spec.
Item Audio Practical Max Output, L(Mono)/R Min 6 Typ 7 Max 9 Unit W Remark LCD
Internal pattern of VCT-PRO
7) When adjustment is completed, Exit adjustment mode using EXIT key on R/C
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TROUBLESHOOTING
1. No power
(1) Symptom
1) Minute discharge does not occur at module. 2) Front LED does not activate.
(2) Press check
Start Check
Is the power cord plugged in?
No
Plug in the power cord.
Yes
Are the line filter and PSU connected?
No
Connect the cable.(SC100)
Yes Is the correct fuse for the PSU in place? LCD(F100) Yes Is the PSU and 13-14pin cable connected to the VSC board? Yes
No
Replace the fuse.
No
Connect the 13-14pin cable.
Next remove all cables connected to the PSU and switch the AV voltage to manual. If the ST-by 5V does not operate, replace the PSU.
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2. Protect mode
(1) Symptom
1) After lighting once it does not discharge minutely from the module. 2) The relay falls.(there is an audible "Click".) 3) The color of the front LED turns from green to red.
(2) Follow check
Start Check
Is the Power Board normal ? Yes Are all the connectors normal? Yes
No
Is the output the normal Low/High voltage except for the Stand-by 5V?
No Replace Power Board.
No
After checking each connector does is operate correctly?
No Replace the connector.
Is the Y-Board normal?
No
Is the appropriate fuse (FS2,FS3) on the Y-B/D? Yes
No
Is the output voltage normal after removing the P1 connector of the Y-B/D?
Replace the Y-Board.
Yes
Replace the fuse.
Is the Z-Board normal? Yes
No
Is appropriate fuse (FS1,FS2) on the Z-B/D? Yes
No
Is the output voltage normal after removing the P1 connector of the Z-B/D?
Replace the Z-Board.
Replace the fuse.
Is the X- Board normal?
No
Is the output voltage normal after removing the P100, 110, 200, 210 connector of the X-B/D?
After removing the P100, 110 and the output voltage is normal : Replace the Right X-B/D After removing the P200, 210 and the output voltage is normal : Replace the Left X-B/D
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3. No Raster
(1) Symptom
1) No OSD or image are displayed on the screen. 2) The front LED remains green.
(2) Follow check
Start Check
Does minute discharge at Module?
No
Is the inverter /VaVs on?
No
Is output the normal Low/High voltage except for the Stand-by 5V?
Replace the Power board.
Yes Yes Check the LCD Module
Is there a fault with the link cable?
No
Reconnect the link cable in P804.
Yes
Is the output for the IC500 normal?
No
Replace the VSC.
4. In the case an unusual display in RF mode.
Is the video output of the Tuner normal? (Check TU400_Pin13) Is the input voltage normal?(Check Pin3) No Yes Check the power.(L1103)
No
Yes
Is the I2C communication normal? (Check Pin9, Pin10)
No Check the Tuner.
A
Is the LVDS Cable connected? No Re-insert the cable.
Yes
Change the IC(IC500)
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5. In the case of an unusual display in rear AV mode.
Is video input of the A/V jack normal? (Check R172)
No
Check the input source.
Yes
Sam as Block A
6. In the case of an unusual display in Side AV mode.
Is the video input of the A/V jack normal? (Check CN703 Pin9) Yes
No
Check the input source.
Sam as Block A
7. In the case of an unusual display in Side S-Video mode.
Is the video input of the A/V jack normal (Check CN703 Pin1, Pin3)? Yes
No
Check the input source.
Sam as Block A
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8. In the case of an unusual display in SCART 1 mode.
Is the video input of the A/V jack normal? (Check R172)
No
Check the input source.
Yes
Sam as Block A
9. In the case of an unusual display in SCART 1_RGB mode.
Is the video input of the A/V jack normal?(Check R110,R170, R171, R173) Yes
No
Check the input source.
Sam as Block A
10. In the case of an unusual display in SCART 2 mode.
Is the video input of the A/V jack normal? (Check R174)
No
Check the input source.
Yes
Sam as Block A
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11. In the case of an unusual display in component 1 mode.
Is the video input of the A/V jack normal? (Check R248, R249,R250)
No
Check the input source.
Yes
Change the IC(IC500)
12. In the case of an unusual display in component 2 mode.
Is the video input of the A/V Jk202 normal? (Check R241, R242, R243)
No
Check the input source.
Yes
Change the IC(IC500)
13. In the case of an unusual display in RGB mode.
Is the R, G, B input and H, V sync of the JK201 normal?(Check R220, R221, R253, R254, R255) Yes
No
Check the input source.
Change the IC(IC500)
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14. No Sound
(1) Symptom
1) LED is green. 2) There is a picture but no sound.
(2) Follow check
Is there sound in any mode?
No Is the speaker on?
No
Set speaker on in the menu.
Yes
Yes
Is there no sound only for HDMI?
No Download the EDID data.
Is the speaker cable normal?
No
Check the Speaker cable.
Yes Is the output of IC600 (R607, R608) normal? Yes Yes Check the signal after IC600. Refer to circuit diagram.
Yes
Is there no sound only AV /COM2/PC?
No
No
Replace the IC600.
Is the IC500 operating normal?
No Replace the IC500.
Yes Is there no sound only for RF? No Check the Tuner In/Out. Is the IC601 operating normal? No Replace the IC601.
Yes
Replace the VSC BD.
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15. HDMI mode
Is only video normal?
Yes Download EDID data each port.
No
Is only audio normal?
Yes
1. Check TV input mode. (HDMI 1 port support HDMI and DVI. So if you input DVI signal and PC audio from phone jack, You can hear PC audio.) 2. Unplug and plug in the HDMI cable. (sometimes ESD surge occurred at HDMI port.) 3. Check the HDMI Mute register. (0x68, offset 0x37) 4. Check the Audio-out channel mute register (0x68, offset 0x32) is appropriately enabled.
Check the TMDS line wave. (R312~E3273)
Is the wave continuous?
No
Check HDMI source. Change to another source or cable.
Yes
1. Check the HDMI receiver's status register. (0x60, offset 0x66) - If the value is 0xf or 0x8, it is normal. 2. Check the HDCP register. (0x6, offset 0x32) - Enable bit 6 : HDCP key loaded - Enable bit 5 : HDCP decryption active - Enable bit 4 : HDCP authentication attempted
Reset TMDS power down/ on register. - 0x60, offset 0x3f => 0xff
Yes
Normal video, Normal audio?
No Replace the IC303.
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BLOCK DIAGRAM
HDMI
- 25 -
300 201 400 205 520 203 600 580 204
200
530 206 120 590 430 202 582 581 150
EXPLODED VIEW
- 26 -
591
P/NO : MFL36696906
Mar., 2007 Printed in Korea