Related Manuals for LG TH-20LA60PS
Summary of Contents for LG TH-20LA60PS
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Page 1: Service Manual
LCD TV SERVICE MANUAL CHASSIS : ML-05MA MODEL: TH-20LA60PS CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -
Page 2: Table Of Contents
CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 SVC OSD ....................9 SVC REMOCON ..................10 DISASSEMBLY ..................11 TROUBLE SHOOTING ................13 BLOCK DIAGRAM...................17 WIRING DIAGRAM ..................19 EXTERNAL DEAWING WITH KEY DIMENSION ......... 21 EXPLODED VIEW .................. 22 EXPLODED VIEW PARTS LIST ..............23 REPLACEMENT PARTS LIST ............... -
Page 3: Product Safety
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. -
Page 4: Servicing Precautions
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service unit under test. manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or... - Page 5 IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair which the IC leads are inserted and then bent flat against the Excessive heat applied to the copper foil of any printed circuit circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit should be used to remove and replace the IC.
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Page 6: Specification
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to ML-05MA chassis. 2. Requirement for Test Testing for standard of each part must be followed in below condition. (1) Temperature : 10°C ±... - Page 7 5. Optical Feature(LCD Module) Item Specification Remark Viewing Angle 85/85 89/89 <CR≥10> 85/85 89/89 Luminance Luminance (cd/m Module itself -Measure Condition - Dynamic mode - Input : RF or AV(full white) - Between 20min and 30min after aging Variation MAX / MIN Contrast Ratio -Module itself, All white / All black...
- Page 8 7. Component Video Input (Y, P Specification Remark Resolution H-freq(kHz) V-freq.(kHz) (480I) 15.73 60.00 525I (480P) 31.47 59.94 525P (576I) 15.625 50.00 625I (576P) 31.25 50.00 625P 8. Signal Timing (Resolution) Timing chart of Receivable Mode Specification Proposed Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 640 x 480...
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Page 9: Svc Osd
SVC OSD * This menu is showed at TV, Video and S-Video input when etnered service menu. 1. RF AGC - TV Auto Gain Control. (This is valid only RF signal) 2. Remote Control - Select Remote control type A or B. 3. -
Page 10: Svc Remocon
SVC REMOCON FUNTION REAMARK To turn the TV on or off POWER To turn the TV on automatically if the power is supplied to the TV. (Use the POWER ON POWER key to deactivate): It should be deactivated when delivered. To activate the mute function. -
Page 11: Disassembly
DISASSEMBLY Remove the fixing screw. (2pcs) Remove the fixing screw. (4pcs) Remove the Hinge cover. Remove the Stand. Remove the fixing screw. (4pcs) Remove the fixing screw. (8pcs) Remove the Bracket. Remove the Back cover. Remove the fixing screw. (2pcs) Remove the fixing screw. - Page 12 # 10 POWER BOARD J205 P200 P904A CN201B MAIN BOARD P901A P50A Remove the fixing screw. (4pcs) Remove the fixing screw. (4pcs) Remove the Power board. Remove the Main board. # 11 # 12 P3000 JACK BOARD Remove the fixing screw. (3pcs) Remove the fixing screw.
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Page 13: Troubleshooting
TROUBLESHOOTING :[A]Process No power Ref.1 Check Power S/W Check short of main B/D Check 15V or ST_ 5V of Control Key B/D or Change Power B/D of Power B/D Pass Fail Pass Check Output of Check IC 1004, IC1005 Change VCTi(IC200) IC1004, IC1005(Main B/D) Of Main B/D PIN 7 LEVEL(High 3.3V) - Page 14 No Raster on video Signal No Raster on TV(RF) (Video, S-Video) Signal Pass Check 5V, 33V of TU100 Check the output of Repeat A PROCESS Re-soldering or TU100(tuner) Fail Change the defect part Pass Pass Check short of main B/D Check the input &...
- Page 15 No Raster on video Signal No Raster on TV(RF) (Video1) Signal Pass Check 5V, 33V of TU100 Check the output of Repeat A PROCESS Re-soldering or TU100(tuner) Fail Change the defect part Pass Pass Check short of main B/D Check the input &...
- Page 16 No Sound (ALL MODE) Check the input source Change source input Fail Pass Check the input/ Re-soldering or Change output of IC200 of Main B/D IC200 Fail Pass Ref.6 Check the input/ Re-soldering or Change output of IC600 of Main B/D IC600 Fail Pass...
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Page 17: Block Diagram
BLOCK DIAGRAM - 17 -... - Page 18 BLOCK DIAGRAM DESCRIPTION 1. Video Controller Unit & Display Data Conversion Unit The video controller unit receives the video signals inputted through the tuner, AV and S-Video terminal. It converts them into an ITU656 signal through the microcomputer (VCTI) combined with the video decoder that integrates various functions in one chip.
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Page 19: Wiring Diagram
WIRING DIAGRAM (1) 6631900063G 6631900063E 6631T11021D 6631900022S 6631900063C 6631900022T 6631900063F 6631900063H - 19 -... - Page 20 WIRING DIAGRAM (2) P3001 P3000 J205 P200 P500 P904A CN201B P901A P50A P903A P3000 P3000 P3002 P3001 - 20 -...
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Page 21: External Deawing With Key Dimension
External drawing with key dimension 498.0 20.6 81.5 102.0 95.0 382.0 498 max 23.4 73.8 259.3 max - 21 -... -
Page 22: Exploded View
EXPLODED VIEW - 22 -... -
Page 23: Exploded View Parts List
PART NO. DESCRIPTION 30919D0027E Cover Assembly, P20LA60PS ML-05MA 20" HOTEL EAJ32011801 LCD,Module-TFT, LC201V02-SDA3 VGA 20.1INCH 640X480 450CD COLOR 72% 4/3 800:1 P7(NEC D-IC, Locking) LG PHILIPS LCD 3809900144A Cover Assembly, P20LA6 NON . 3043900019A Base Assembly, P20LA6 STAND TOTAL 68719ST851C PCB Assembly,Sub, SUB T.T ML05MA P20LA60P-MD JAPAN IR/LED/EARPHONE... -
Page 24: Replacement Parts List
REPLACEMENT PARTS LIST For Capacitor & Resistors, the CC, CX, CK, CN, CH : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit in the CQ : Polyestor RS : Metal Oxide Film P/No. means as follows; CE : Electrolytic RN : Metal Film CF : Fixed Film RH : CHIP, Metal Glazed(Chip) - Page 25 DATE: 2006. 08. 08. DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C238 0CH3104K566 0805B104K500CT 100nF 10% 50V C330 0CK104CK56A 0603B104K500CT 100nF 10% 50V C239 0CK104CK56A 0603B104K500CT 100nF 10% 50V C331 0CK104CK56A 0603B104K500CT 100nF 10% 50V C240...
- Page 26 DATE: 2006. 08. 08. DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C544 0CC080CK11A C1608C0G1H080DT 8pF 0.5PF 50 C954 JCE8106F691 MVK4.0TP16VC10M 10uF 20% 16V C545 0CH3104K566 0805B104K500CT 100nF 10% 50V C955 JCE107WF6DC MVK6.3TP16VC100M 100uF 20% 1 C546...
- Page 27 DATE: 2006. 08. 08. DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L101 6210TCE001G HH-1M3216-501JT 500OHM 3.2X1 Q303 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V L1012 6210TCE001G HH-1M3216-501JT 500OHM 3.2X1 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V L104 6210TCE001A HB-1S2012-080JT 8OHM 2X1.25X...
- Page 28 DATE: 2006. 08. 08. DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R135 0RH0332D622 MCR10EZHJ330 33OHM 5% 1/8W 2 R268 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W 0RH4703D622 MCR10EZHJ474 470KOHM 5% 1/8W R269 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W...
- Page 29 DATE: 2006. 08. 08. DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R522 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W R754 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1 R523 0RH3301D622 MCR10EZHJ332 3.3KOHM 5% 1/8W R755 0RJ0000D677...
- Page 30 DATE: 2006. 08. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION SW3005 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW3006 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW3007 6600M000052 JPS2259 DC 30VDC 0.3A - - - IR & LED & EARPHONE BOARD C3000 0CH5470K416 0805N470J500LT 47pF 5% 50V C C3001...
- Page 31 TUNER(MAIN) INPUT(MAIN) VCTi(MAIN) 3D_COMB(MAIN)
- Page 32 S/W & ROM(MAIN) SCALER(MAIN) AMP(MAIN) INTERFACE(MAIN)
- Page 33 POWER(MAIN) CONTROL BOARD IR / LED / EARPHONE BOARD JACK BOARD...
- Page 34 Jul., 2006 P/NO : MFL30105581 Printed in Korea...
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