LG 20LC1R-ZG Service Manual Download Page 16 | Manualshive

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No Raster

Check LED Status

on display unit

Check the input/

Output of U301

Check

U401~U405, U407, U409

Check inverter

Connector or inverter

Check input source cable and jack

Repeat A PROCESS

Fail

Change U401~U405,

U407, U409

Fail

Change U301

Fail

Change inverter
connector or inverter

Fail

Change panel link
cable or module

Fail

Check panel link
Cable or module

Pass

Pass

Pass

Pass

Pass

:[B]Process

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Summary of Contents for 20LC1R-ZG

Page 1: ...D TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS CL 81 MODEL 20LC1R ZG website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...NTS CONTENTS 2 PRODUCT SAFETY 3 DISASSEMBLY 6 SPECIFICATION 7 ADJUSTMENT INSTRUCTION 12 SVC REMOCON 14 TROUBLE SHOOTING 15 BLOCK DIAGRAM 19 WIRING DIAGRAM 21 EXPLODED VIEW 22 REPLACEMENT PARTS LIST 24 SVC SHEET ...

Page 3: ...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 ...

Page 4: ...y 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 ...

Page 5: ...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 boa...

Page 6: ... 6 DISASSEMBLY 1 2 Detached stand assy Remove the screws 3 Disassembly stand assy 4 Detached Backcover Remove the screw 5 Open the Backcover s latch with jig 6 Unlock latch between Cabinet and Backcover ...

Page 7: ...ion No Item Specification Remark 1 TFT Color LCD Module 20 1 inches 510 54mm diagonal 0 2125mm H x0 6375mm V xRGB TTL 8BIT 16 777 216 colors 432 H x 331 5 V x 25 D Anti Glare Hard Coating 3H Normally Black 6 CCFL 6 lamps 25ms R T 12ms F T 13ms LPL NOTE Specifications and others are subject to change without notice for improvement No 1 Product Width W Lengh D Height H Dimension Before Packing 492 4...

Page 8: ...3 0 343 0 359 0 313 0 328 0 304 0 316 No 1 2 3 4 5 Reference table Function No Item Specification Remark 1 Teletext TOP FLOF TOP option 2 REMOCON NEC Code PAL 3 AV Input 1 Rear 4 S Video Input 1 Rear 5 Component Input X 6 PERI TV Connector Full SCART 1 Rear 7 Ear phone output 1 8 2 Carrier Stereo BG DK 9 NICAM Stereo BG I LL 10 2 Carrier Daul BG DK 11 NICAM Daul BG I LL 12 DW Double Window Mode X ...

Page 9: ... Program Manual Program Program Edit Favorite Program None 7 Picture PSM Dynamic CSM Normal Dynamic Contrast 100 Brightness 50 Colour 70 Sharpness 50 Tint 0 NTSC OPTION 8 Sound SSM Flat AVL Off Balance 0 9 Special Input TV Child Lock Off Power Indicator On Language English Area Management 10 Time Clock Off Time Off On Time Pr 1 Vol 30 Off Auto Sleep Off ...

Page 10: ...Spectification 1 RED 3 Blue 5 S T GND 7 Green GND 9 N C 11 ID0 GND 13 H Sync 15 SCL 1 Contrast Brightness Colour Sharpness Tint 2 Power On Off Input select Menu OK Volume PR 2 Green 4 ID2 GND 6 RED GND 8 Blue GND 10 D GND 12 SDA 14 V Sync Shell GND Remark For SVC Only Video Active Off Power Consumption 65W 1W 110V 1W 220V 0W Item Specification Remark No LED Color BLUE ORANGE OFF ...

Page 11: ...25 PAL I DIGITAL STEREO FLOF C 21 PR 38 855 25 PAL I DIGITAL MONO FLOF C 69 PR 39 687 25 NTSC M Crosshatch Circle MONO C 50 PR 40 200 25 SECAM L DIGITAL MONO C 08 PR 41 663 25 SECAM L DIGITAL NICAM DUAL C 45 PR 42 503 25 PAL B Crosshatch 16 9 MONO FLOF C 25 PR 43 687 25 NTSC M DEM Circle MONO C 50 PR 44 189 25 PAL B STEREO C 07 PR 45 327 25 PAL D A2 STEREO FLOF S 24 PR 46 615 25 PAL B NICAM STEREO...

Page 12: ...m 3 Compare UOC version with version of hex file 4 Push Brouse button and select hex file 5 Push Auto Execute button 6 Occur an Error try again and again 2 5 3 1 2 ADC Process Board Adjustment line process 1 Auto Gain Offset Adjustment Convert to AV in Input Mode Signal equipment displays 0 7V 16 Step Gray pattern Model 202 Pattern 29 at MSPG925L Output Voltage 700 mVp p Impress Resolution 576i an...

Page 13: ...uct spec C07 E07 Nicam DUAL Check C 52 E52 Nicam Stereo Check Preset CH information 3 2 5 Stand by operation confirmation Check if Power LED Color and Power Consumption operates as standard Measurement Condition 230V 50Hz Analog 3 3 Option configuration Press IN START Key by using the SVC Remote Controller and Press option value after then configure the option data that is written in the product s...

Page 14: ...o move channel up down or to select a functiondisplayed on the screen 16 VOL To adjust the volume or accurately control a specific function 17 ENTER To set a specific function or complete setting 18 CH OP1 To use as a red key in the teletext mode 19 CH OP2 To use as a green key in the teletext mode 20 SWAP OP3 To use as a yellow key in the teletext mode 21 INPUT OP4 To use as a blue key in the tel...

Page 15: ...off Check short of main B D or Change Lips Change U406 Change LED Assy Check 15V or 5V of Lips Check Output of U406 Check LED Assy Check J103 J125 J126 Connector Fail Fail Change Q402 Check Output of Q402 Fail Pass Fail Pass Pass Pass A Process ...

Page 16: ...7 U409 Check inverter Connector or inverter Check input source cable and jack Repeat A PROCESS Fail Change U401 U405 U407 U409 Fail Change U301 Fail Change inverter connector or inverter Fail Change panel link cable or module Fail Check panel link Cable or module Pass Pass Pass Pass Pass B Process ...

Page 17: ...12 R194 R198 R184 Repeat A Process Check the output of TU701 Check the input output of U301 Check the input output of U101 Check input source cable and jack Fail Fail Fail Fail Re soldering or Change the defect part Check X301 Fail Re soldering or Change the defect part Check 5V 33V of TU701 Re soldering or Change the defect part Pass Pass Pass Pass ...

Page 18: ...input Check the input source Fail Pass Re soldering or Change the defect part Check X301 Check the input output of U301 Fail Pass Re soldering or Change the defect part Check the input output of U201 Fail Pass Change speaker Check the speaker Fail Pass ...

Page 19: ... 19 BLOCK DIAGRAM ...

Page 20: ...l like Contrast Brightness Sharpness Color tint signals including Adaptive Comb Filter 2 Audio Decoder This block analyzes audio input signal through A V Jack and PC audio and Tuner IF The analyzed signals transmitted to audio amplifier On decoding We can control signal like Bass treble 3 IF Decoder This block can change IF signal to audio and video signal that transmitted to Video audio decoder 4...

Page 21: ...21 WIRING DIAGRAM 5 3 4 6 6 2 6631900037A 50P LPL 6631900037B 50P AUO 6631T20037Q 3P 6631900024D 3P 6631T20034M 11P 6631T20029S 5P 6631900026A 4P 6631900026A 4P 1 INTERFACE BOARD Only 20LC1R _LPL Module ...

Page 22: ... 22 EXPLODED VIEW 010 060 020 070 080 090 100 030 140 130 120 110 050 040 041 ...

Page 23: ...LFP LED IR 68719ST798B PWB PCB ASSEMBLY SUB SUB T T CL81 2XLC1 SLEELFP CONTROL 49519S0001A METAL ASSEMBLY FRAME 20LC1 6871TPT319A PWB PCB ASSEMBLY POWER 6 LAMP TV MNT MFT POWER TOTAL BRAND 33139P2011C MAIN TOTAL ASSEMBLY 20LC1R ZG SLEELFP BRAND CL 81 4950TKA373A METAL SHIELD REAR AV 20LC1 6400GTTX02A SPEAKER FULLRANGE EF1527C 6428 6 TOPTONE FULL RANGE GENERAL 16OHM 5 7W 82DB OTHERS 40 70 210HZ 687...

Page 24: ...0V 10 X7R 2012 R TP C3093 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C3102 0CK475DD57A 4 7UF 2012 10V 10 X5R R TP C313 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C317 0CH3682K516 6800PF 2012 50V 10 B Y5P C331 0CH3103K516 10000PF 50V 10 B Y5P 2012 C332 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C334 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C335 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C336 0CH3104K566 0 1UF 50V 10...

Page 25: ...710 0CK103CK51A 0 01UF 1608 50V 10 R TP B C150 0CH6101K416 100PF 50V 5 NP0 2012 R TP C191 0CH6331K416 330PF 2012 50V 5 NP0 R TP DATE 2005 09 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C3012 0CH6470K416 47PF 2012 50V 5 NP0 R TP C3014 0CH6470K416 47PF 2012 50V 5 NP0 R TP C3024 0CH6470K416 47PF 2012 50V 5 NP0 R TP C3028 0CH6470K416 47PF 2012 50V 5 NP0 R TP C3033 0CH6470K416 47PF 2012 50V 5 NP0 ...

Page 26: ...KE010A KIA7812AF KEC 2P DPACK R TP U402 0IRH033200A BA033FP E2 MOLD 3 TP REGULA DATE 2005 09 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION U404 0IRH033200A BA033FP E2 MOLD 3 TP REGULA U409 0ISS780500H KA78M05 R 3P D PAK TP 5V 0 U704 0ISS780500H KA78M05 R 3P D PAK TP 5V 0 U112 0ISTL00031A MC74HC4066ADR2G LF ON SEMI L201 61409B0002A DBF 1030S DONGBANG 30UH 15 L202 61409B0002A DBF 1030S DONGBANG 3...

Page 27: ...10 W 2012 5 00 R151 0RH1001D622 1K OHM 1 10 W 2012 5 00 DATE 2005 09 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R177 0RH0000D622 0 OHM 1 10 W 2012 5 00 D R178 0RH0000D622 0 OHM 1 10 W 2012 5 00 D R182 0RH1200D622 120 OHM 1 10 W 2012 5 00 R183 0RH1002D622 10K OHM 1 10 W 2012 5 00 R184 0RH0752D622 75 OHM 1 10 W 2012 5 00 R191 0RH0752D622 75 OHM 1 10 W 2012 5 00 R194 0RH0222D622 22 OHM 1 10 W 2...

Page 28: ...TP R204 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R208 0RJ1203D677 120K OHM 1 10 W 5 1608 R T R215 0RJ1802D677 18K OHM 1 10 W 5 1608 R TP DATE 2005 09 23 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R234 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R250 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R T R253 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP R254 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP R301 0RJ1000D677 100 OHM 1 10 W...

Page 29: ...1 SW507 140 058B EVQ PB2 05K MATUSHITA NON 1 SW508 140 058B EVQ PB2 05K MATUSHITA NON 1 ZD502 0DZ560009CF MTZJ5 6B TP ROHM K DO34 0 5 ZD505 0DZ560009CF MTZJ5 6B TP ROHM K DO34 0 5 ZD504 0DZ560009CF MTZJ5 6B TP ROHM K DO34 0 5 U501 6712SCA232A TSOP34838SO1 VISHAY 38KHZ L LED551 0DLBE0048AA BRIGHT LED ELECTRONICS BL H LED552 0DLBE0048AA BRIGHT LED ELECTRONICS BL H Q551 0TR390409AE FAIRCHILD KST3904 ...

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Page 35: ...Aug 2005 Printed in Korea P NO 38289S0022C ...

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