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LG 42PT81 Service Manual
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LG 42PT81 Service Manual

LG 42PT81 Service Manual

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PLASMA TV
SERVICE MANUAL
CHASSIS : PP7BA
MODEL : 42PT81
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Internal Use Only
website:http://biz.LGservice.com
42PT81-ZB

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Summary of Contents for LG 42PT81

  • Page 1 Internal Use Only website:http://biz.LGservice.com PLASMA TV SERVICE MANUAL CHASSIS : PP7BA MODEL : 42PT81 42PT81-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    EXPLODED VIEW .................. 30 EXPLODED VIEW PARTS LIST ............31 REPLACEMENT PARTS LIST ............... 32 SVC. SHEET ....................PRINTED CIRCUIT DIAGRAM ..............Copyright©2007 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright©2007 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    0.9 x 0.676 (1 pixel = 3 RGB cells) Pixel Format 1024 x 768 Pixels RGB strip arrangement Pixel Type RGB Closed type Copyright©2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 Audio Input (3 EA) PC Audio, Component (1EA), L/R Input SIDE AV(1EA) Audio variable out(1EA) SIDE(1EA) USB Input(1EA) DivX, MP3, JPEG Copyright©2007 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Adjustment Instruction

    (5) Checking DVR Function and HDD * Check DVR Function as follow on 4-2 and find HDD failure under malfunction. Copyright©2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 * Press the FRONT-AV Key on R/C for converting input mode. (Change RS-232 Host : pc, BaudRate : 115200bps) - System control RS-232 Host should be “PC“ for adjustment. Copyright©2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only...
  • Page 8 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 5. [5]-Checksum : Changeable by total EDID data Copyright©2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only...
  • Page 9 (5) Auto-RGB OK means the adjustment is completed. (5) Auto-RGB OK means the adjustment is completed. Copyright©2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 6,500K 0.313±0.002 0.329±0.002 +0.003 (Fig.7) ( R/G/B gain and R/G/B offset Default values are different in according to using module) Copyright©2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 G-Offset_Warm B-Offset_Warm R-Offset_Cool G-Offset_Cool B-Offset_Cool COLOR TEMP. 03h(Cool,Normal,Warm,User) W/B Adjustment Start Using Internal Pattern W/B Inner Pattern Signal Adjustment Completion Copyright©2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 0~99 ACK is 0, there is Signal ACK is 1, there is No Signal ACK is 2, power Off Status Copyright©2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 Max:fe blue -0x6f green -0x80 Red,Blue,Green offset Jd,Je,Jf 00<90 Min:00 Initial Value : red -0x80 Max:fe blue -0x82 green -0x80 Copyright©2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 Soft Touch Reserved Area Option Option1 Option2 Option3 Option4 System Control1 System Control2 System Control2 Power-off History Panel Control Fan Control Copyright©2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 Time Control Recorded TV To Set Manual Recording To Set Scheduled List To Set Video Quality High HDD Format To Set Copyright©2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...

  • Page 16: Troubleshooting

    After remove all cables connected PSU(except the CN101), authorizes the AC voltage marking manual. If the ST-by 5V does not operate, replace the PSU. Copyright©2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 After removing the P200, 210 and the output normal? 200, 210 connector of voltage is normal : Replace the Left X-B/D the X-B/D? Copyright©2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 Is there a fault with Reconnect the link cable in P600. the link cable? Is the output for the Replace the VSC. IC700 normal? Copyright©2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 5. In the case of an unusual display in rear AV mode(Main). Is video input of Check the input source. the A/V jack normal? Sam as Block A Copyright©2007 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 Is the video input of the A/V jack Check the input source. normal? (Check R339, R341,L310) Sam as Block A Copyright©2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 11. In the case of an unusual display in SCART 2 mode(main). Is the video input of Check the input source. the A/V jack normal? (Check R115) Sam as Block A Copyright©2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Change the IC(IC700) 14. In the case PIP doesn’t display in other mode(Sub). - Same as the case of main except block A should be change to B Copyright©2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only...
  • Page 23 H, V sync of the Check the input source. JK500 normal?(Check R509, R511, R512, R513, R515) Change the IC(IC700) Copyright©2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 Is the IC401 Replace the IC401 operating normal? Is the IC402 Replace the IC402 operating normal? Replace the VSC B/D Copyright©2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 Normal video, Reset TMDS power down/ on register. Replace the IC1200. Normal audio? - 0x60, offset 0x3f : 0xf7 => 0xff Copyright©2007 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Block Diagram

    BLOCK DIAGRAM Copyright©2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 MEMO Copyright©2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...

  • Page 28: Exploded View

    EXPLODED VIEW Copyright©2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...

  • Page 29: Exploded View Parts List

    Plate Assembly, AV 60PY30, Plate Tuner Bottom Assy. FOR EURO PASS3 AGU30996906 Plate Assembly, REAR AV Plate Tuner Cover Assy. Digital, 42PB4, H4, Analog PVR EBR39182201 Hand Insert PCB Assembly, Main MAIN M.I PP7BA 42PT81-ZB - Hand Insert PCB Assembly EBT39182801 Chassis Assembly, SUB PP7BA 42PT81-ZB HDD Chassis Assembly EBR38051701 Hand Insert PCB Assembly, CONTROL M.I PP79A 42PB4RT-TB - CONTROL KEY HAND INSERT...

  • Page 30: Replacement Parts List

    MVK10TP16VC470M 470uF 20% 16V 80M C1189 0CK102CK56A 0603B102K500CT 1nF 10% 50V X7R -5 C1109 0CE337WJ6D8 MVK12.5TP35VC330M 330uF 20% 35V 4 Copyright©2007 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 C1362 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R C1309 EAE32166101 CS1005XR473K250CR 0.047uF 10% 25V C1363 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R Copyright©2007 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 MVG6.3TP16VC220M 220uF 20% 16V 13 C1416 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R - C215 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R - Copyright©2007 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 C1608C0G1H560JT 56pF 5% 50V C0G - C330 0CK225DFK4A C2012Y5V1C225MT 2.2uF 20% 16V Y5V C454 0CC560CK41A C1608C0G1H560JT 56pF 5% 50V C0G - Copyright©2007 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C521 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C732 0CE226WF6DC MVK5.0TP16VC22M 22uF 20% 16V 30MA Copyright©2007 LG Electronics. Inc. All right reserved. - 36 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 0603B104K500CT 100nF 10% 50V X7R C787 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R C929 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R - Copyright©2007 LG Electronics. Inc. All right reserved. - 37 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 CDS3C05GTA 5.6V 6.4V 19V 1.9A 1W IC1110 0IPMG00027A SC156515M-1.8TR 2.2TO5.5V 1.8V 0W D507 EAH33945901 CDS3C30GTH 30V 50V 120V 1.9A 1W S Copyright©2007 LG Electronics. Inc. All right reserved. - 38 - LGE Internal Use Only Only for training and service purposes...
  • Page 37 Filter, MBW3216-501TF 500ohm 3.2X1.6X0.85 L1016 6200J00005N Filter, HH-1M2012-121JT(H:1mm) 120OHM 2X1 L1202 EAM30764101 Filter, MBW3216-501TF 500ohm 3.2X1.6X0.85 L1017 6200J00005N Filter, HH-1M2012-121JT(H:1mm) 120OHM 2X1 Copyright©2007 LG Electronics. Inc. All right reserved. - 39 - LGE Internal Use Only Only for training and service purposes...
  • Page 38 2SC3875S(ALY) NPN 5V 60V 50V 150M Q101 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150M Q101 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150M Copyright©2007 LG Electronics. Inc. All right reserved. - 40 - LGE Internal Use Only Only for training and service purposes...
  • Page 39 0RJ2002D677 MCR03EZPJ203. 20KOHM 5% 1/10W 160 R1003 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 100 R111 0RJ3002D677 MCR03EZPJ303 30KOHM 5% 1/10W 1608 Copyright©2007 LG Electronics. Inc. All right reserved. - 41 - LGE Internal Use Only Only for training and service purposes...
  • Page 40 0RJ1004C678 MCR01MZPJ105 1MOHM 5% 1/16W 1005 R1246 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R1318 0RJ0471D677 MCR03EZPJ4R7 4.7OHM 5% 1/10W 1608 Copyright©2007 LG Electronics. Inc. All right reserved. - 42 - LGE Internal Use Only Only for training and service purposes...
  • Page 41 MCR01MZPJ101 100OHM 5% 1/16W 1005 R1383 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 R1539 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R Copyright©2007 LG Electronics. Inc. All right reserved. - 43 - LGE Internal Use Only Only for training and service purposes...
  • Page 42 MCR03EZPJ000 0OHM 5% 1/10W 1608 R R208 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R2320 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R Copyright©2007 LG Electronics. Inc. All right reserved. - 44 - LGE Internal Use Only Only for training and service purposes...
  • Page 43 MCR03EZPJ472 4.7KOHM 5% 1/10W 160 R326 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W 1608 R434 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1608 R Copyright©2007 LG Electronics. Inc. All right reserved. - 45 - LGE Internal Use Only Only for training and service purposes...
  • Page 44 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R497 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 160 R618 0RJ0752C678 MCR01MZPJ750 75OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. - 46 - LGE Internal Use Only Only for training and service purposes...
  • Page 45 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W 1608 R727 0RJ0562D677 MCR03EZPJ560 56OHM 5% 1/10W 1608 R816 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. - 47 - LGE Internal Use Only Only for training and service purposes...
  • Page 46 MCR01MZPJ000 0OHM 5% 1/16W 1005 R 6631T12006W Harness, 12505HS-0400 12505HS-0400 550mM 1 R874 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R 6631T39004D Harness, 6631T39004D 1-1123722-9 1-1123722 Copyright©2007 LG Electronics. Inc. All right reserved. - 48 - LGE Internal Use Only Only for training and service purposes...
  • Page 47 6600VR1004A SKHMPWE010 1C1P 12VDC 0.05A HORIZ SW700 6600VR1004A SKHMPWE010 1C1P 12VDC 0.05A HORIZ SW900 6600VR1004A SKHMPWE010 1C1P 12VDC 0.05A HORIZ Copyright©2007 LG Electronics. Inc. All right reserved. - 49 - LGE Internal Use Only Only for training and service purposes...
  • Page 48 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 USB2_VBUS1 R108 C104 +C107 P105 POWER 330uF SMW200-05P R102 READY USB_DM USB2_VBUS1 1/10W C102 USB_DM R101 READY USB_DP C103 1/10W USB_DP Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 AMBER 5V_ST Y-GRN D101 SAM5670 R102 Q102 2SC3875S PRINTED CIRCUIT BOARD MAIN(TOP) MAIN(BOTTOM) SIDE A/V(BOTTOM) SIDE A/V(TOP) PRE-AMP(TOP) PRE-AMP(BOTTOM) CONTROL CONTROL Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Sep., 2007 P/NO : MFL396403502 Printed in Korea...

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