LG TH-20LA60PS Service Manual Download Page 16 | Manualshive

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Sound input :
IC600(Audio AMP) #3, 5

Ref.6

No Sound

(ALL MODE)

Check the speaker wire

Check the input/

output of IC200 of Main B/D

Check the input/

output of IC600 of Main B/D

Check the input source

Check the speaker

Pass

Pass

Pass

Pass

Ref.6

Change source input

Fail

Re-soldering or Change
IC200

Fail

Re-soldering or Change
IC600

Fail

Check speaker

Fail

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Summary of Contents for TH-20LA60PS

Page 1: ...TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS ML 05MA MODEL TH 20LA60PS website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...ETY 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 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: ...vely 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 ground...

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: ...62 CATV C13 C38 4 Input Voltage AC 100V 240V 10 50Hz 60Hz 5 Picture Size 510 54cm 20 1 inch 6 Tuning System FS NTSC 7 Operating Environment Temp 0 40 C Humidity 5 90 8 Storage Environment Temp 20 60 C Humidity 5 90 9 Display LCD Module LPL_IPS Maker 10 LCD Module Feature Maker LPL LPL 20 1 Type TFT Color LCDModule Active Display Area 20 1 inches 510 54cm diagonal Pixel Pitch mm 212 5 mm x 637 5 mm...

Page 7: ...W X 17 Swivel Speaker X 18 ZOOM X 19 DRP X 5 Optical Feature LCD Module No Item Specification Remark Min Typ Max 1 Viewing Angle R L 85 85 89 89 CR 10 U D 85 85 89 89 2 Luminance Luminance cd m2 380 450 Module itself 290 390 Measure Condition Dynamic mode Input RF or AV full white Between 20min and 30min after aging Variation 1 3 MAX MIN 3 Contrast Ratio 500 800 Module itself All white All black 3...

Page 8: ... Contrast 80 60 35 80 Standard Brightness 50 55 65 50 Color 50 45 35 50 Sharpness 50 50 50 50 Tint 0 0 0 0 9 Sound SSM Auto Balance 0 CENTER 10 Special Auto off Off 9 Outgoing Condition No Specification Proposed Resolution H freq kHz V freq Hz Pixel clock MHz 1 640 x 480 31 469 59 94 25 17 VESA VGA 7 Component Video Input Y PB PR Specification No Resolution H freq kHz V freq kHz Remark 1 480I 15 7...

Page 9: ...ice 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 Shipment setting Set Factory initial value 4 Booster Control On Off Auto this function is disable at 20 model 5 Scaler Download Set scaler download environment ...

Page 10: ...put To check the front AV To move channel up down or to select a function displayed on the screen To adjust the volume or accurately control a specific function To set a specific function or complete setting To move the channel down in the PIP screen To use as a red key in the teletext mode To move the channel in the PIP screen To use as a green key in the teletext mode To switch between the main ...

Page 11: ...Remove the Metal Remove the fixing screw 2pcs Remove the Cover Remove the fixing screw 2pcs Remove the Control PCB Remove the fixing screw 4pcs Remove the Stand Remove the fixing screw 8pcs Remove the Back cover 1 4 2 5 3 6 7 8 IR LED EARPHONE BOARD P3002 P3000 CONTROL PCB P3000 C3002 Remove the fixing screw 2pcs Remove the IR LED EARPHONE Board ...

Page 12: ...xing screw 3pcs Remove the Metal Remove the fixing screw 8pcs Remove the Speaker Remove the fixing screw 4pcs Remove the Main board Remove the fixing screw 2pcs Remove the Jack board 9 12 10 11 13 JACK BOARD P3000 MAIN BOARD P904A P50A CN201B P901A POWER BOARD J205 P200 ...

Page 13: ...Check Power S W of Control Key B D Check Output of IC1004 IC1005 Main B D Check LED Assy Check IC 1004 IC1005 PIN 7 LEVEL High 3 3V Pass Pass Pass Pass Pass A Process Change LED Assy Check short of main B D or Change Power B D Check 15V or ST_ 5V of Power B D Fail Fail Fail Fail Ref 1 15V CN201B 10 11 Ref 1 ST_5V CN201B 6 7 Ref 1 ...

Page 14: ...s Pass Pass Pass Pass Check short of main B D or Change IC500 Check 5V 33V of TU100 Re soldering or Change the defect part Fail Fail Fail Fail Check the input source Check short of main B D or Change the defect part Check the input output of IC200 of main B D Check the input output of IC500 of main B D Ref 2 Ref 3 ITU656 Clock Out IC200 VCTi 83 Ref 3 CVBS INPUT IC200 VCTi 60 Ref 2 ...

Page 15: ...e defect part Fail Fail Fail Fail Check short of main B D or Change IC500 Fail Check the input source Check short of main B D JACK B D Check R217 Level Video1 RF HIGH 3 3V Check the input output of IC200 Check the input output of IC300 Comb Filter Pass Check the input output of IC500 Ref 4 Ref 5 ITU656 Clock Out IC200 VCTi 83 Ref 5 Y separated OUTPUT IC300 Comb Filter 96 Ref 4 Pass Check short of ...

Page 16: ...ker wire Check the input output of IC200 of Main B D Check the input output of IC600 of Main B D Check the input source Check the speaker Pass Pass Pass Pass Ref 6 Change source input Fail Re soldering or Change IC200 Fail Re soldering or Change IC600 Fail Check speaker Fail ...

Page 17: ...56 IO 0 7 656 IO_CLK IC600 TPA3008D2 AUDIOAMP SPK_L R IC203 M62320FP L R SOUND P N H P GND TTL 20 inch LCD IPS MODULE HEAD PHONE 8 bit IO Expander SPEAKER 8 ohm Lips 15V ST_5V INV_CTL 3 3V INV_BR POWER_0NOFF VIDEO Audio L R VIDEO CVBS S VHS_Y C TUNER TU100 VIDEO J1 S VIDEO JA3100 ACCOUNT PORT JA3000 IC201 AT24C16AN EEPROM IC950 TPA6110A2 H P AMP IC501 AT24C16AN EEPROM IC300 TC90A65F 3D COMB FILTER...

Page 18: ...ssing and sound signal processing It also manages the RF signals received from the tuner The scaler can control timing to fit into the LCD panel and can also control the size and position of the input signal 2 Power Supply Unit The power supply unit provides 15V and 5V DC power to the main board The PWM Step Up DC DC Converter circuit is used to generate the 33V used for the tuner 15V is directly ...

Page 19: ... 19 4P 4P 14P 11P 3P 10P 6P 41P 6631900063G 6631900022S 6631900063H 6631900022T 6631900063C 6631900063E 6631T11021D 6631900063F WIRING DIAGRAM 1 ...

Page 20: ... 20 P3001 J205 P200 P500 P3000 P3000 P3001 P3002 P3000 CN201B P901A P50A P904A P903A WIRING DIAGRAM 2 ...

Page 21: ... 21 External drawing with key dimension 102 0 410 20 6 498 0 100 382 0 498 max 100 136 4 95 0 483 2 max 259 3 max 73 8 41 0 23 4 0 5 18 81 5 ...

Page 22: ...EXPLODED VIEW 010 020 070 080 090 100 110 030 150 040 050 120 130 140 060 22 ...

Page 23: ... TOTAL COVER KNOP PLATE FOR JAPAN 6709900013A Power Supply Assembly FREE TH 20LA60 LCD YUYANG MATSUSHITA 20 1 TV PB FREE 68719ST852B PCB Assembly Sub SUB T T ML05MA P20LA60 JAPAN CHINA CONTROL BOARD 33139N1004E Main Total Assembly P20LA60P MD JAPAN MATSUSHITA ML 05MA 48159K0008A Plate Assembly REAR P20LA6 68719ST847B PCB Assembly Sub SUB T T ML05MA P20LA60P MD JAPAN JACK BOARD EAB30825501 Speaker ...

Page 24: ...RT NO DESCRIPTION SPECIFICATION C1101 JCE477EH618 KMG5 0TP25VB470M 470uF 20 2 C111 0CH2103K516 0805B103K500CT 10nF 10 50V C1110 0CH5102K416 0805N102J500LT 1nF 5 50V C0 C1111 0CH5102K416 0805N102J500LT 1nF 5 50V C0 C1112 0CK225DK94A CL21F225ZBFNNNE 2 2uF 20TO C1118 JCE107WF6DC MVK6 3TP16VC100M 100uF 20 1 C1119 JCE107WF6DC MVK6 3TP16VC100M 100uF 20 1 C112 0CH3104K566 0805B104K500CT 100nF 10 50V C112...

Page 25: ...82pF 5 50V C C328 0CK106EF56A C3216X7R1C106KT 10uF 10 16V C329 0CK104CK56A 0603B104K500CT 100nF 10 50V DATE 2006 08 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C330 0CK104CK56A 0603B104K500CT 100nF 10 50V C331 0CK104CK56A 0603B104K500CT 100nF 10 50V C332 0CH3104K566 0805B104K500CT 100nF 10 50V C333 0CH2103K516 0805B103K500CT 10nF 10 50V C334 0CK474CH94A 0603F474Z250CT 470nF 20TO 8 C335 0CK475...

Page 26: ...16 0805N102J500LT 1nF 5 50V C0 C944 0CH5102K416 0805N102J500LT 1nF 5 50V C0 C950 0CK225DK94A CL21F225ZBFNNNE 2 2uF 20TO C951 0CK105DH56A C2012X7R105KFT 1uF 10 25V X C952 0CK225DK94A CL21F225ZBFNNNE 2 2uF 20TO C953 0CH3104K566 0805B104K500CT 100nF 10 50V DATE 2006 08 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C954 JCE8106F691 MVK4 0TP16VC10M 10uF 20 16V C955 JCE107WF6DC MVK6 3TP16VC100M 100uF...

Page 27: ... 60V 50V Q301 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q302 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V DATE 2006 08 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION Q303 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q50 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q51 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q902 0TR150400BA 2SA1504S ASY PNP 5V 50V Q903 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q950 0TR387500AA 2SC...

Page 28: ...ZPJ000 0OHM 5 1 10W 1 R266 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R267 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W DATE 2006 08 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R268 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R269 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R270 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R271 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R272 0RJ0222D677 MCR03EZPJ220 22OHM 5 1 10W R273 0RJ...

Page 29: ...3EZPJ000 0OHM 5 1 10W 1 R723 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R725 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R726 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R753 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 DATE 2006 08 08 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R754 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R755 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R756 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1...

Page 30: ...3001 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V Q3002 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V R3000 0RH1000D622 MCR10EZHJ101 100OHM 5 1 8W R3001 0RH1002D622 MCR10EZHJ103 10KOHM 5 1 8W R3002 0RH1002D622 MCR10EZHJ103 10KOHM 5 1 8W R3003 0RH4701D622 MCR10EZHJ472 4 7KOHM 5 1 8W R3004 0RH1001D622 MCR10EZHJ102 1KOHM 5 1 8W 2 R3006 0RH4701D622 MCR10EZHJ472 4 7KOHM 5 1 8W R3007 0RH4701D622 MCR10EZHJ472 4 7KO...

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 IR LED EARPHONE BOARD CONTROL BOARD JACK BOARD ...

Page 34: ...Jul 2006 Printed in Korea P NO MFL30105581 ...

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