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LG 42PC3RA Service Manual
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LG 42PC3RA Service Manual

Plasma tv
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PLASMA TV

SERVICE MANUAL

CHASSIS : PP61A
MODEL : 42PC3RA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
42PC3RA-ZJ
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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Summary of Contents for LG 42PC3RA

  • Page 1: Service Manual

    PLASMA TV SERVICE MANUAL CHASSIS : PP61A MODEL : 42PC3RA 42PC3RA-ZJ CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ..................3 DESCRIPTION OF CONTROLS ................4 SPECIFICATIONS ....................10 ADJUSTMENT INSTRUCTIONS ...............12 TROUBLE SHOOTING GUIDE ................22 PRINTED CIRCUIT DIAGRAM ................31 BLOCK DIAGRAM .....................35 EXPLODED VIEW ....................36 EXPLODED VIEW PARTS LIST ................37 REPLACEMENT PARTS LIST................38 SCHEMATIC DIAGRAM..................

  • Page 3: Safety Precautions

    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 X-RADIATION, Shock, Fire, or other Hazards.

  • Page 4: Description Of Controls

    OK button to select the desired input source ( TV , AV1 , AV2 , S-Video2 , AV3 , AV4 (except 42PC3RV *, 42PC3RA* ), Component , RGB , HDMI1/DVI or HDMI 2 ). Selects your desired picture format.
  • Page 5 Selects the remote operating modes. MODE INPUT POWER TELETEXT These buttons are used for teletext. INPUT BUTTONS For further details, see the ‘Teletext’ section. TEXT SIZE POSTION PIP PR- PIP PR+ PIP INPUT THUMBSTICK Allows you to navigate the on-screen menus and (Up/Down/Left adjust the system settings to your preference.

  • Page 6: Front Panel Controls

    Front Panel Controls PROGRAMME Buttons VOLUME Buttons OK Button MENU MENU Button INPUT INPUT Button ON/OFF Button Remote Control Sensor Power/Standby Indicator • illuminates red in standby mode. • illuminates orange when the set is switched on.
  • Page 7 Back Connection Panel AV 1 AV 2 AC IN RGB IN COMPONENT COMPONENT IN (PC/DTV) HDMI IN VIDEO AUDIO REMOTE AUDIO IN VARIABLE CONTROL IN (RGB) AUDIO OUT AV IN 3 V IN 3 ANTENNA MONO RS-232C IN S-VIDEO S-VIDEO VIDEO AUDIO (CONTROL &...
  • Page 8 ACCESSORIES Owner’s Manual Owner’s Manual Batteries Remote Control Power Cord For 42PC1RV*, 42PC3RV*, 42PC3RA* 2-bolt for stand assemlby 2-Wall brackets 2-eye-bolts This feature is not available for all models.
  • Page 9 STAND INSTALLATION(OPTION) Place the set with the screen facing down on a cushion or soft cloth as shown in Figures 1. Before unfolding the stand, please make sure two locks (A) on the bottom of the stand push outward. Pull the stand out as shown above in Figures 2 ~ 3. After unfolding the stand, please insert and tighten the screws in the holes (B) on the bottom of the stand.

  • Page 10: Specifications

    42” Wide Color Display Module Plasma Display Panel Aspect Ratio 16:9 PDP Module PDP42X3, Clear Filter RGB Closed Type Operating Environment 1)Temp. : 0~40deg LGE SPEC. 2)Humidity : 0~85% Storage Environment 3)Temp. : -20~60deg 4)Humidity : 0~85% Input Voltage 100-240V~, 50/60Hz Maker : LG...
  • Page 11 2. Model General Specification Item Specification Remark Market Broadcasting system PAL-BG/I/DK, NTSC Available Channel BAND NTSC VHF/UHF C1~C69 2~83 CATV S1~S47 1~71 Receiving system Upper Heterodyne SCART Jack(2EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60 Video Input (1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC, PAL60 S-Video Input (1EA)

  • Page 12: Adjustment Instructions

    ADJUSTMENT INSTRUCTIONS 1. Application Object (2) Visaul I2C & LPT Driver Installation. These instructions are applied to all of the 42” PLASMA TV, PP61A Chassis. 2. Notes Install the LPT Driver (1) Because this is not a hot chassis, it is not necessary to use Install the Visual I2C an isolation transformer.
  • Page 13 (5) Exchange the bootloader.bat file. 4. S/W Program Download 4-1. Download Method 1 (PCB Ass’y) (1) Connect the download jig to D-sub jack. (2) Execute ‘Download.vi2c’ program in PC, then a main window will be opened. (3) Double click the blue box and confirm “Bootloader Version” as 40.
  • Page 14 5) Double click the download file low, then “edit” window will be (9) Under Downloading process. opened. (10) If download is failed, for example “No acknowledge from slave”, Execute download again from(1). (6) Click the choice button in the “edit window”, then “file choice window”...
  • Page 15 (3) Push the S/W off (Disconnect SCL to GND using switch at jig. (7) Double click the download file low then, “edit” window will be opened. (8) Chick the choice button I n the “edit window”, then “file choice window’ will be opened. (4) `Execute ‘Download.vi2c’...
  • Page 16 (11) Under Downloading progress. (4) Click “GO” button. (12) If download is failed, for example “No acknowledge from slave”, execute download again from (1). If you don’t push the “go”, the Hex file would not be downloaded although the download proceeds normally at first 4-3.
  • Page 17 (7) Double click the download file low then, “edit” window will be (11) Under Downloading progress. opened. (12) If download is failed, for example “No acknowledge from slave”, execute download again from (1). (8) Chick the choice button In the “edit window”, then “file choice window’...

  • Page 18: Adjustment Method

    (5) If download is failed, for example “No acknowledge from Caution: Each PCB assembly must be checked by check JIG slave”, execute download again from(1). set. (Because power PCB Assembly damages to PDP Module, especially be careful) 8. POWER PCB Assy Voltage Adjustment (Va, Vs Voltage Adjustment) 8-1.
  • Page 19 9C6B 6B9C For RGB EDID For HDMI EDID Digital 40044 9C6C 6C9C 42PC1RV Analog 40045 9C6D 6D9C Digital 40046 9C6E 6E9C 42PC3RA Analog 40047 9C6F 6F9C Digital 40048 9C70 709C *EDID Data Item Condition Hexadecimal Data 42PC3RV Analog 40021 9C55...
  • Page 20 9-1. Required Test Equipment (3) Set the S/W as below. (1) Adjusting PC with S/W for writing EDID Data.(S/W: EDID TESTER Ver.2.5) (2) A Jig for EDID Download (3) Cable: Serial(9Pin or USB) to D-sub 15Pin cable, D-sub 15Pin cable, DVI to HDMI cable. 9-2.

  • Page 21: White Balance

    10. Adjustment of White Balance (8) Adjust it until color coordination becomes as below. Brightness : High Light : 80 ± 20cd/m2 Color-Coordinate : High Light : X : 0.283 ± 0.003 10-1. Required Equipment Y : 0.298 ± 0.003 (1) Remote Controller for Adjustment.

  • Page 22: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE 1. Power Board 1-1. The whole flowchart which it follows in voltage output state Start check Is it identical Doesn't the Is the Interface screen whole come with Power Off signal operated? out? condition? 1. Check the Power Off 2.
  • Page 23 1-2. 42” Power Board Structure T801: Vs Trans T901: Va Trans T112: Low Voltage Trans T501: ST-BY Trans T601: PFC Inductor...

  • Page 24: No Power

    2. No Power (1) Symptom 1) Front LED is NO light. 2) The Set doesn’t discharge little. (2) Check following Is plug in power cord? Plug in power cord. Is the Line Filter Cable to PSU Connect the Cable. connected? Is the Fuse(F101) on Exchange the Fuse.
  • Page 25 3. Cannot Power on (1) Symptom 1) Front LED is Red, but doesn’t cahge Green. (Cannot turn on the SET) 2) Don’t operate power on using a Remocon or Local key. (2) Check following Pull off the power cord and wait until discharge entirely (you can watch the LED on a main board through a Back cover.
  • Page 26 4. Protect Mode (1) Symptom 1) After once shining, it does not discharge minutely from module. 2) The Rely falls down.(The sound is audible “click”) 3) The front LED turn Green to Red. (2) Check following Does the Low/High voltage Exchange the Is normal PSU? operate normally?
  • Page 27 5. No Raster (1) Symptom 1) Front LED is Green. 2) The Set doesn’t discharge a little. (2) Check following Does the Low/High voltage Exchange the Is normal PSU? operate normally? Do cable connect well each Exchange the Is normal cables? wafer? cable Disconnecting...

  • Page 28: No Sound

    6. No Sound (1) Symptom 1) Front LED is Green. 2) The Set display a screen, but a sound doesn’t output. (2) Check following 1) Speaker part Are Speaker Cables Good? Are Speaker Cables Good? Are Speaker units good? Are Speaker Cables Good? Are Speaker Cables Good? Are Speaker units good? 2) Main board part...
  • Page 29 7. Display the screen abnormally (1) Symptom 1) Disp lay the screen abnormally at specific mode. (2) Check following 1) Noise appears at RF mode. Is the Tuner cable Are input voltage, I2C, and Is the Tuner part good? connected well? CVBS output good? Insert the cable exactly Exchange the Tuner...
  • Page 30 8. No Picture (1) Symptom 1) Some mode doesn’t display. 2) Front LED is green. 3) The set still discharge a little. (2) Check following 1) RF-mode doesn’t display Is the Tuner cable Is the LVDS cable Are good some elements Connected? connected? (C, R, L, or Diode) at path?

  • Page 31: Printed Circuit Diagram

    PRINTED CIRCUIT BOARD MAIN(TOP) CONTROL...
  • Page 32 MAIN(BOTTOM) PRE-AMP...
  • Page 33 POWER ( TOP )
  • Page 34 POWER ( BOTTOM )

  • Page 35: Block Diagram

    BLOCK DIAGRAM...

  • Page 36: Exploded View

    EXPLODED VIEW...

  • Page 37: Exploded View Parts List

    Plate Assembly, ASSY PLATE COVER ANALOG 68719MMX58A PCB Assembly, MAIN1 M.I PP61A 42PC3R ZJ 68719MMX58B PCB Assembly, Main MAIN1 M.I PP61A 42PC3RA-ZJ M.I LGEMA CKD 68719SMJ63A PCB Assembly, Sub SUB M.I PP61A 42PC3RV Z LOCAL SKD 68719SMJ63C PCB Assembly, Sub SUB M.I PP61A 42PC3RV ZJ/TJ/MJ LOCAL 68719SMM24A PCB Assembly, SUB M.I PP61A 42PC1RV ZJ CKD LOCAL KEY...

  • Page 38: Replacement Parts List

    REPLACEMENT PARTS LIST LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION Q103 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150MA Q103 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150MA IC303 0ISTL00031A MC74HC4066ADR2G MC74HC4066ADR2G Q105 0TR387500AA 2SC3875S(ALY) NPN 5V 60V 50V 150MA U701 0IZZ9H9009A 0IMCR02273A 0IMCR02273A PHILIPS DIP...
  • Page 39 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
  • Page 40 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
  • Page 41 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
  • Page 42 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
  • Page 43 LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C839 0CK104CK56A 0603B104K500CT 100nF 10% 50V C934 0CK104CK56A 0603B104K500CT 100nF 10% 50V C840 0CK102CK56A 0603B102K500CT 1nF 10% 50V C935 0CE477WF6DC MVK10TP16VC470M 470uF 20% 16V C842 0CK102CK56A 0603B102K500CT 1nF 10% 50V C936 0CK104CK56A 0603B104K500CT 100nF 10% 50V...
  • Page 44 LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C989 0CK103CK56A 0603B103K500CT 10nF 10% 50V R152 0RB0100J609 PRW01T10R10J 0.1OHM 5% 1W R158 0RD0221Q609 RDM94T1J2R20 2.2OHM 5% 1/4W COIL & INDUCTOR & TRANSFORMER R159 0RD0222Q609 RDM94T1J22R0 22OHM 5% 1/4W L1004 6140VB0004B Coil, LN-15A1 26uH 12X9MM LEAD R160...
  • Page 45 LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION L400 6210TCE001G Filter,BeadHH-1M3216-501JT 500OHM L501 6210TCE001G Filter,BeadHH-1M3216-501JT 500OHM D1004 0DL233309AC LED,Chip SAM2333 RED/Y-GREEN 2.7V 2.8V 30mA L502 6210TCE001G Filter,BeadHH-1M3216-501JT 500OHM D750 0DL233309AC LED,Chip SAM2333 RED/Y-GREEN 2.7V 2.8V 30mA L806 6210TCE001G Filter,BeadHH-1M3216-501JT 500OHM LD101 0DLAU0410AA...
  • Page 46 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION P1001 6602T25008J Conector,WaferSMW250-10P 0.40MM P101 6602T20009C Conector,WaferSMAW200-04P 4P 2.00MM P301 6602T20008J Conector,WaferSMW200-10P 10P 2.00MM P601 6602T12007D Conector,WaferGT121-31P-TD 31P 1.25MM P800 6602T25008M...
  • Page 47 P/No : 38549D0018A-(1/2) 2006.05.30...
  • Page 48 P/No : 38549D0018A-(2/2) 2006.05.30...
  • Page 49 SVC. SHEET : 38549D0018A - S1...
  • Page 50 Oct., 2006 P/NO : 38289S0023E Printed in Korea...

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