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SERVICE MANUAL
WIDE LCD PANEL TELEVISION
8 2005 YA222
LT-17C50BJ, LT-17C50BU, LT-17C50BU/Z, LT-17C50SU, LT-17C50SU/Z, LT-17C88SJ
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P
PC
TV
VCR
TV
DVD
TABLE OF CONTENTS
1 2 3 4 5 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA222 2005/8
SPECIFICATION
Items Dimensions ( W × H × D ) Mass Power Input Power Consumption TV RF System Colour System Stereo System Teletext System Receiving Frequency Contents 46.5cm × 37.0cm × 20.0cm [Included stand] 46.5cm × 32.6cm × 7.2cm [TV only] 6.0kg [Included stand] 5.0kg [TV only] AC100V to AC240 V, 50 Hz 56W (Standby: 3.0W) CCIR B/G, I, D/K, L PAL / SECAM / NTSC 3.58 / NTSC 4.43 (NTSC: EXT only). A2 (B/G, D/K), NICAM (B/G, I, D/K, L) FLOF (Fastext), TOP, WST (World Standard System) VHF 47MHz to 470MHz UHF 470MHz to 862MHz CATV 116MHz to 172MHz / 220MHz to 469MHz VIF 38.9MHz(B/G, D/K, I) SIF 33.4MHz(5.5MHz:B/G) / 32.9MHz(6.0MHz:I) / 32.4MHz(6.5MHz:L,D/K) PAL 4.43MHz SECAM 4.40625MHz / 4.25MHz NTSC 3.58MHz / 4.43MHz 17V-inch wide aspect (15:9) Diagonal : 43.3cm (H:37.1cm × V : 22.3cm) Horizontal : 1280 dots × Vertical : 768 dots (W-XGA) 5W + 5W(10% THD) 3.4cm, round type × 2 75 unbalanced, coaxial 21-pin Euro connector (SCART socket ) × 2 Component Video RCA pin jack × 3 625p / 525p / 625i / 525i Y : 1V (p-p), Positive (Negative sync provided), 75 Cb/Cr : 0.7V(p-p), 75 Audio 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2 S-Video Mini-DIN 4 pin × 1 Y: 1V (p-p), Positive (Negative sync provided), 75 C: 0.286V (p-p) (Burst signal), 75 Video 1V (p-p), Positive (Negative sync provided), 75 , RCA pin jack × 1 Audio 500mV (rms), High impedance, RCA pin jack × 2 D-sub 15pin × 1 R/G/B : 0.7V (p-p), 75 HD / VD : 1V (p-p) to 5V (p-p), high impedance < Available signal > VGA : 640 pixels × 480 pixels (Horizontal : 31.5kHz / Vertical : 60Hz) XGA : 1024 pixels × 768 pixels (Horizontal : 48.4kHz / Vertical : 60Hz) 3.5mm stereo mini jack × 1 500mV (rms), Low impedance, RCA pin jack × 2 More than 0 to 1000mV (rms) (+2.2dBs), low impedance (80Hz when modulated 100%), RCA pin jack × 1 3.5mm stereo mini jack × 1 RM-C1860 (AA/R6 dry cell battery × 2)
Intermediate Frequency Colour Sub Carrier Frequency LCD Panel Screen Size Display Pixels Audio Power Output Speaker Aerial Terminal (VHF/UHF) EXT-1 / EXT-2 (Input / Output) EXT-3(Input)
EXT-4 (Input)
PC (RGB) Input
PC AUDIO Input Audio Output Subwoofer Output Headphone Remote Control Unit
Design & specifications are subject to change without notice.
1-2 (No.YA222)
SECTION 1 PRECAUTION
1.1 SAFETY PRECAUTIONS (6) Isolation Check (Safety for Electrical Shock Hazard) After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. a) Dielectric Strength Test The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second. (. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade. b) Leakage Current Check Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.). Alternate Check Method Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 per volt or more sensitivity in the following manner. Connect a 1500 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER (HAVING 1000 /V, OR MORE SENSITIVITY)
(1) The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only. (2) Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the parts list in Service manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards. (4) Don't short between the LIVE side ground and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing. Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken. (5) When service is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.
0.15 F AC-TYPE PLACE THIS PROBE ON EACH EXPOSED METAL PART
1500 GOOD EARTH GROUND
10W
(No.YA222)1-3
1.2
INSTALLATION 1.2.3 INSTALLATION REQUIREMENTS To ensure safety in an emergency such as an earthquake, and to prevent accidents, ensure that measures are taken to prevent the TV dropping or falling over. Use the supplied screws to firmly attach the supplied hooks (OPTION) to the back of the TV, and use commercially available cord to fix the TV to rigid components such as walls and columns.
Wall
1.2.1 HEAT DISSIPATION If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. The temperature sensor that protects the unit will be activated when internal temperature exceeds the pre-determined level and power will be turned off automatically.Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.
Ventilation hole
Hook
1.2.2 INSTALLATION REQUIREMENTS Ensure that the minimal distance is maintained, as specified below, between the unit with and the surrounding walls, as well as the floor etc.Install the unit on stable flooring or stands.Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.
TV Stand
It fixes in a band.
*Diagram differs from actual appearance.
100 mm
100 mm
100 mm
100 mm 50 mm
TV / AV MENU P/ch
1.2.4 NOTES ON HANDLING (1) WHEN TAKING UNIT OUT OF A PACKING CASE When taking the unit out of a packing case, do not grasp the upper part of the unit. If you take the unit out while grasping the upper part, the LCD PANEL may be damaged because of a pressure. Instead of grasping the upper part, put your hands on the lower backside or sides of the unit. (2) AS FOR PRESSING OR TOUCHING A SPEAKER Be careful not to press the opening of the speaker in the lower part of the unit and around them since the decorative sheet on the surface of the openings may be deformed.
1-4 (No.YA222)
1.3
HANDLING LCD PANEL 1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL) (1) Avoid placing the unit under direct sunlight over a prolonged period of time. This may cause the optical filter to deteriorate in quality and COLOUR. (2) Clean the filter surface by wiping it softly and lightly with a soft and lightly fuzz cloth (such as outing flannel). (3) Do not use solvents such as benzene or thinner to wipe the filter surface. This may cause the filter to deteriorate in quality or the coating on the surface to come off. When cleaning the filter, usually use the neutral detergent diluted with water. When cleaning the dirty filter, use water-diluted ethanol. (4) Since the filter surface is fragile, do not scratch or hit it with hard materials. Be careful enough not to touch the front surface, especially when taking the unit out of the packing case or during transportation. 1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.): (1) Do not exert pressure on the front of the LCD panel (filter surface). It may cause irregular COLOUR. (2) Pay careful attention not to scratch or stain the front of the LCD panel (filter surface) with hands. (3) When replacing exterior parts, the front (LCD panel) should be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).
1.3.1 PRECAUTIONS FOR TRANSPORTATION When transporting the unit, pressure exerted on the internal LCD panel due to improper handling (such as tossing and dropping) may cause damages even when the unit is carefully packed. To prevent accidents from occurring during transportation, pay careful attention before delivery, such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the LCD panel of this unit is made of glass and therefore fragile: (1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL When transporting the LCD panel of the unit, use a special packing case (packing materials). A special packing case is used when a LCD panel is supplied as a service spare part. (2) ATTACH PROTECTION SHEET TO THE FRONT Since the front (display part) of the panel is vulnerable, attach the protection sheet to the front of the LCD panel before transportation. Protection sheet is used when a LCD panel is supplied as a service spare part. (3) AVOID VIBRATIONS AND IMPACTS The unit may be broken if it is toppled sideways even when properly packed. Continuous vibration may shift the gap of the panel, and the unit may not be able to display images properly. Ensure that the unit is carried by at least 2 persons and pay careful attention not to exert any vibration or impact on it. (4) DO NOT PLACE EQUIPMENT HORIZONTALLY Ensure that it is placed upright and not horizontally during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break. During transportation, ensure that the unit is loaded along the traveling direction of the vehicle, and avoid stacking them on one another. For storage, ensure that they are stacked in 2 layers or less even when placed upright.
(No.YA222)1-5
SECTION 2 SPECIFIC SERVICE INSTRUCTIONS
2.1 FEATURES OFF TIMER This function can set the TV to automatically turn off after a set time. COLOUR SYSTEM If the picture is not clear or no colour appears, change the current colour system to another colour system. T-V LINK When you have a T-V LINK compatible VCR connected to the EXT-2 Terminal on the TV,it is easier to set up the VCR and to view videos. ZOOM This function can change the screen size according to the picture aspect ratio.
2.2
MAIN DIFFERENCE LIST Items LT-17C50BU BLACK EU type(2-pin ) LT-17C50SU SILVER LT-17C50BU/Z BLACK SWE Type(3-pin ) EU type(2-pin ) LT-17C50SU/Z SILVER LT-17C50BJ BLACK UK type(3-pin ) LT-17C88SJ SILVER
CABINET COLOUR POWER CORD
2.3
21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2
Signal designation AUDIO R output AUDIO R input AUDIO L output AUDIO GND GND (B) AUDIO L input B input FUNCTION SW (SLOW SW) GND (G) SCL / T-V LINK G input SDA GND (R) GND (YS) R / C input Ys input (FAST SW) GND (VIDEO output) GND (VIDEO input) VIDEO output VIDEO / Y input COMMON GND 1V(P-P) (Negative sync), 75 1V(P-P) (Negative sync), 75 R : 700mV(B-W), 75 C : 300mV(P-P), 75 Low : 0V-0.4V, High : 1V-3V, 75 700mV(B-W), 75 500mV(rms) (Nominal),, High impedance 700mV(B-W), 75 Low : 0V-3V High : 8V-12V, High impedance Matching value 500mV(rms) (Nominal),, Low impedance 500mV(rms) (Nominal),, High impedance 500mV(rms) (Nominal),, Low impedance Used (R1) Used (TV OUT) Used Used Used (L1) Used Used Used Not used Used Not used Used Used Used (R) Used Used Used Used (TV OUT) Used Used EXT-1 Used (TV OUT) Used (R2) Used (LINE OUT) Used Used Used (L2) Used Used Used Used (SCL2 / TV-LINK) Used Used (SDA2) Used Not used Used (C2/R) Used Used Used Used (LINE OUT) Used Used EXT-2 Used (LINE OUT)
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
(P-P= Peak to Peak, B-W= Blanking to white peak)
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
21
19 17
15
13
11
9
7
5
3
1
1-6 (No.YA222)
2.4
TECHNICAL INFORMATION
2.4.1 LCD PANEL This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals. 2.4.1.1 SPECIFICATIONS The following table shows the specifications of this unit. Item Displayed colour Brightness Contrast ratio Response time View angle 16777216 colours 450cd/m2 400: 1 25ms Horizontally: 176°, Vertically: 170° Specifications Remarks 256 colours for R, G, and B
2.4.1.2 PIXEL FAULT There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows. BRIGHT FAULT In this pixel fault, a cell that should not light originally is lighting on and off. For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off. DARK FAULT In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting. For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting. FLICKER FAULT In the pixel fault, a cell that should light originally or not light originally is flashing on and off. For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.
(No.YA222)1-7
2.5
BASIC OPERATION OF SERVICE MODE
2.5.5 SERVICE MODE SETTING ITEMS Setting menu Adjust Setting items Group Mode Col. Temp. Contrast Brightness Colour Sharpness Red Green Blue Aps Volume First APS Contents
2.5.1 HOW TO ENTER THE SERVICE MODE (1) Press [INFORMATION] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN.
SERVICE MODE SCREEN
Service Adjust ... Options ... Aps Wss Test ... 17JVC 0. 0. 86 Sep 27 2004 08:47:10
2.5.2 HOW TO EXIT THE SERVICE MODE Press the [MENU] key to exit the Service mode. 2.5.3 CHANGE AND MEMORY OF SETTING VALUE SELECTION OF SETTING MENU & ITEM · [FUNCTION / ] key : Select the SETTING MENU & ITEM · [OK] key : Decision the SETTING MENU & ITEM CHANGE OF SETTING VALUE (DATA) · [FUNCTION / ] key. MEMORY OF SETTING VALUE (DATA) The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys 2.5.4 SERVICE MODE SELECT KEY LOCATION
[
[OK] ]
[
]
---------------------------------Option 1 If ON, TV starts with APS menu at Start-up BG ---DK ---I ---L ---L' ---FM Prs Avl On Adjusts the FM Prescaler value, when Automatic Volume Levelling is On Nicam Prs Avl On Adjusts the Nicam Prescaler value, when Automatic Volume Levelling is On Scart Prs Avl On Adjusts the Scart Volume value, when Automatic Volume Levelling is On Scart Volume Avl On Adjusts the Scart Volume value, when Automatic Volume Levelling is On FM Prs Avl Off Adjusts the FM Prescaler value, when Automatic Volume Levelling is Off Option 2 Nicam Prs Avl Off Adjusts the Nicam Prescaler value, when Automatic Volume Levelling is Off Scart Prs Avl Off Adjusts the Scart Prescaler value, when Automatic Volume Levelling is Off Scart Volume Avl Off Adjusts the Scart Volume value, when Automatic Volume Levelling is On Avl Enable/disable Automatic Volume Levelling System Sound ---Carrier ---LDLY ---AGC ---Aps Wss Test Programme ---VPS ---Scart Volume Avl Off ---Pdc Format 1 ---Pdc Format 2 ---Name ---WSS ----
1-8 (No.YA222)
SECTION 3 DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE NOTE: · Make sure that the power cord is disconnected from the outlet. · Pay special attention not to break or damage the parts. · When removing each board, remove the connectors as required. Taking notes of the connecting points (connector numbers) makes service procedure manageable. · Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors. 3.1.1 REMOVING THE STAND UNIT · Remove the TFT DOOR SOCKET / AV DOOR SOCKET. (1) Remove the 2 screws [A], then remove the FOOT TOP COVER. (2) Remove the 4 screws [B], then remove the STAND UNIT. 3.1.2 REMOVING THE HANDLE · Remove the STAND UNIT. (1) Remove the 4 screws [C]. (2) Remove the HANDLE. 3.1.3 REMOVING THE BACK COVER · Remove the STAND UNIT. · Remove the HANDLE. (1) Remove the 5 screws [D]. (2) Remove the BACK COVER toward you. 3.1.4 REMOVING THE AV JACK PWB · Remove the STAND UNIT. · Remove the HANDLE. · Remove the BACK COVER. (1) Remove the 2 screws [E]. (2) Remove the AV JACK PWB. 3.1.5 REMOVING THE BRACKET SCART · Remove the STAND UNIT. · Remove the HANDLE. · Remove the BACK COVER. · Remove the AV JACK PWB. (1) Remove the 2 screws [F]. (2) Remove the BRACKET SCART. 3.1.6 REMOVING THE MAIN PWB · Remove the STAND UNIT. · Remove the HANDLE. · Remove the BACK COVER. · Remove the BRACKET SCART. (1) Remove the 7 screws [G]. (2) Remove the MAIN PWB. 3.1.7 REMOVING THE MAIN FRAME · Remove the STAND UNIT / HANDLE & BACK COVER. · Remove the BRACKET SOCKET & BRACKET SCART. · Remove the MAIN PWB. (1) Remove the 7 screws [H]. (2) Remove the MAIN FRAME. 3.1.8 REMOVING THE INVERTER PWB / INVERTER FARME · Remove the STAND UNIT / HANDLE & BACK COVER. · Remove the BRACKET SOCKET, BRACKET SCART & MAIN PWB. (1) Remove the 4 screws [I], then remove the INVERTER PWB. (2) Remove the 4 screws [J], then remove the INVERTER FRAME. (3) Remove the INVERTER PWB & INVERTER FRAME. 3.1.9 REMOVING THE LCD PANEL UNIT · Remove the STAND UNIT, HANDLE & BACK COVER. · Remove the BRACKET SCRAT & MAIN PWB. · Remove the MAIN FRAME & INVERTER PWB / FRAME. (1) Remove the 2 screws [K]. (2) Follow the same step when removing the other hand LCD HOLDER. (3) Sightly raise the both sides of the LCD PANEL UNIT by hand from the FRONT COVER. NOTE: · Pay special attention not to break or damage on the LCD PANEL face or frame. · The LCD PANEL UNIT is fixed to the FRONT COVER (at the back side) by using double-side adhesive tapes. To remove the LCD PANEL UNIT, remove the adhesive tape on the FRONT PANELslowly. 3.1.10 REMOVING THE SPEAKERS · Remove the STAND UNIT, HANDLE & BACK COVER. (1) Remove the 4 screws [L] from each speaker. (2) Remove the SPEAKER from the FRONT COVER. (3) Follow the same when removing the other hand speakers. 3.1.11 REMOVING THE HEADPHONE PWB · Remove the STAND UNIT, HANDLE & BACK COVER. (1) Remove the 1 screw [M]. (2) Remove the HEADPHONE PWB from the FRONT COVER. 3.1.12 REMOVING THE LED PWB · Remove the STAND UNIT, HANDLE & BACK COVER. · Remove the BRACKET SOCKET, BRACKET SCART, MAIN PWB, INVERTER FRAME & MAIN FRAME. (1) Remove the 1 screw [N]. (2) Remove the LED PWB from the FRONT COVER. 3.1.13 REMOVING THE SIDE CONTROL PWB · Remove the LED PWB / HEADPHONE PWB. (1) Remove the 2 screws [O]. (2) Remove the SIDE CONTROL PWB with control knob. (3) Remove the SIDE CONTROL PWB from control knob. (No.YA222)1-9
G
MAIN PWB
MAIN FRAME
H I
J
INVERTER FRAME LCD HOLDER INVERTER PWB
K
TUNER
F
AV DOOR SOCKET
K
BPACKET SCART LCD PANEL UNIT
HANDLE
D
(x5)
BACK COVER
LCD HOLDER
C
BUTTON FUNCTION
O
BUTTON FUNCTION PLATE
TFT DOOR SOCKET
SIDE CONTROL PWB
N
LED PWB LENS LED LENS IR
AV JACK PWB
E
M
HEADPHONE PWB
A B
L
FOOT TOP COVER
SPEAKER
(x4)
FRONT COVER
STAND UNIT
Fig.1
1-10 (No.YA222)
3.2
MEMORY IC REPLACEMENT
· This model uses the memory IC. · This memory IC stores data for proper operation of the video and drive circuits. · When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 SETTINGS OF FACTORY SHIPMENT 3.2.1.1 POWER TV/AV 3.2.1.3 BUTTON OPERATION Setting item Off TV REMOTE CONTROL MENU OPERATION (3) FEATURES Setting position Bright 36 Step 26 Step 11 Step 39 Step 31 Step Cool Min Setting item Sleep Timer Child Lock Language EXT-2 Output Blue Back (4) Install [TV MODE] Setting item Colour System Decorder(EXT-2) Setting position 10 Step 16 Step 15 Step 16 Step Off Mono VCR (5) Install [EXT MODE] Setting item Colour System VCR Auto Off Setting position Auto Off Off Setting position Off Off English TV Off Setting position Setting item MODE Contrast Bright-1 Sharpness Colour Bright-2 Colour Temp. Nolse Red. (2) SOUND Setting item Volume Bass Treble Balance Hyper Sound Sound Mode Setting position ZOOM 3.2.1.2 REMOTE CONTROL DIRECT OPERATION Setting item AUTO Setting position
(1) PICTURE
(No.YA222)1-11
3.3
REPLACEMENT OF CHIP COMPONENT
3.3.1 CAUTIONS (1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it. 3.3.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts. 3.3.3 REPLACEMENT STEPS 1. How to remove Chip parts [Resistors, capacitors, etc.] (1) As shown in the figure, push the part with tweezers and alternately melt the solder at each end.
2. How to install Chip parts [Resistors, capacitors, etc.] (1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder. Then heat and melt the solder at both ends of the chip part. (2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.] [Transistors, diodes, variable resistors, etc.] (1) Apply extra solder to each lead.
SOLDER SOLDER
(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the solder. (3) First solder lead A as indicated in the figure.
(2) As shown in the figure, push the part with tweezers and alternately melt the solder at each lead. Shift and remove the chip part.
A B C
(4) Then solder leads B and C.
A B
NOTE : After removing the part, remove remaining solder from the pattern.
C
1-12 (No.YA222)
SECTION 4 ADJUSTMENT This service manual does not describe ADJUSTMENT. SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING.
(No.YA222)1-13
Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan
(No.YA222)
Printed in Japan VPT