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LG 42PT250 Service Manual
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LG 42PT250 Service Manual

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PLASMA TV
SERVICE MANUAL
CHASSIS : PD13K
MODEL : 42PT250
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67289503 (1108-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42PT250-ZG
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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  • Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com PLASMA TV SERVICE MANUAL CHASSIS : PD13K MODEL : 42PT250 42PT250-ZG CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Printed in Korea P/NO : MFL67289503 (1108-REV00)

  • Page 2: Table Of Contents

    CONTENTS ..........................2 SAFETY PRECAUTIONS ......................3 SPECIFICATION.........................4 ADJUSTMENT INSTRUCTION ....................6 BLOCK DIAGRAM ........................13 EXPLODED VIEW ........................14 SCHEMATIC CIRCUIT DIAGRAM ....................Copyright ©2011 LG Electronics Inc. All rights 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 ©2011 LG Electronics Inc. All rights reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specification

    4) Humidity : 10 % ~ 90 % Input Voltage AC 100 V ~ 240 V, 50 / 60 Hz Maker LG Copyright ©2011 LG Electronics Inc. All rights reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 RGB/DVI Audio, Component, AV L/R Input SPDIF Out(1 EA) SPDIF Out USB(1EA) For SVC, S/W Download, DivX For UK models Copyright ©2011 LG Electronics Inc. All rights reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Adjustment Instruction

    -> If you push “Power on” key, TV set will recover channel information by itself. 3) After function inspection, Push “In-stop” key. Copyright ©2011 LG Electronics Inc. All rights reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 * Caution : Not to push the INSTOP KEY after completion if the function inspection. 42PT450-Z* 42T3 25280 37966 54144 27148 2080 Copyright ©2011 LG Electronics Inc. All rights reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Power Pcb Assy Voltage Adjustment

    - Inside PATTERN is used when W/B is controlled. Connect to auto controller or push Adjustment R/C POWER-ON ->Enter the mode of White-Balance, the pattern will come out. Copyright ©2011 LG Electronics Inc. All rights reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 (4) If Download is successful, OK is display, but If Download is failure, NG is displayed. (5) If Download is failure, Re-try downloads. Copyright ©2011 LG Electronics Inc. All rights reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 (3) Write Serial number by use RS-232. (4) Must check the serial number at signal test of customer support. (Refer to below). Copyright ©2011 LG Electronics Inc. All rights reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 (3) result value - normally status for download : OKx - abnormally status for download : NGx Copyright ©2011 LG Electronics Inc. All rights reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 IF you don t have ADJ R/C, enter Factory Reset in OPTION MENU. (6) When TV turn on, check the Updated version on Diagnostics MENU. Copyright ©2011 LG Electronics Inc. All rights reserved. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: Block Diagram

    BLOCK DIAGRAM Copyright ©2011 LG Electronics Inc. All rights reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Exploded View

    EXPLODED VIEW 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 EXPLODED VIEW. 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 15 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR SCART/COMP1 THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. CI Slot Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 16 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR HDMI/RGB/RS232C/USB THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. COMP2/Side CVBS/SPDIF Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 17 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR Tuner/Audio Amp THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS / Key-IR Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 18 2010-08-31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. MAIN Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 19 2010-08-31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR Memory THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 20 2010-08-31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Power Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 21 GP2R_S7R 2010-08-31 ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Copyright © 2011 LG Electronics Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only...
  • Page 23 PDP TV Repair Guide < Applicable Model > -PD11A/B/L/K -PD13K © C o py r ig h t I n t e rn a l U s e O n l y...

  • Page 24: Pdp Tv Repair Process Index

    PDP TV Repair Process Index Symptom (L) Symptom (M) Page Remark No Picture/Sound OK No Picture/No sound Mal-discharge/Noise/dark picture A. Picture Problem Picture broken/Freezing Vertical bar/ Horizontal Bar No Power (Not turn on) B. Power Problem Turn off (Instant, under watching) C.
  • Page 25 Repair Process A. Picture Problem Making PDP TV Symptom No Picture/Sound OK 1/10 Revision First of all, Check whether all of cable between board was inserted properly or not. (Main B/D ↔ Power B/D, Power B/D ↔ Y-sus B/D, Power B/D ↔ Z-Sus B/D(for 60Inch), LVDS Cable, Speaker Cable, IR B/D Cable) ☞A1 ☞A2 Check Module pattern...
  • Page 26 Repair Process A. Picture Problem Making PDP TV Symptom No Picture/No Sound 2/10 Revision ☞A1 ☞A2 Check Module pattern Check Check Picture Sound by using “TILT” key Normal Close Sound LVDS Cable on SVC R/C ☞A6 Check Move Video No Picture/ Sound Ok Section Close Check...
  • Page 27 Repair Process A. Picture Problem Making PDP TV Symptom Mal-discharge/Noise/dark picture 3/10 Revision Check ☞A15 Picture problem Check CTRL ROM Ver. Type Replace Replace Normal Normal Control board Module type Picture? Picture? Rom Upgrade ☞A14 Mal-discharge Close Close ☞A16 ☞A5 ☞A13 Check Check voltage...
  • Page 28 Repair Process A. Picture Problem Making PDP TV Symptom Picture broken/Freezing 4/10 Revision . By using Digital signal level meter ☞A21 . By using Diagnostics menu on OSD ( Menu→Press red key on R/C →Signal TEST) Check RF Signal level - Signal strength (Normal : over 50%) - Signal Quality (Normal: over 50%) Check whether other equipments have problem or not.
  • Page 29 Repair Process A. Picture Problem Making PDP TV Symptom Vertical bar/ Horizontal Bar 5/10 Revision ☞A19 ☞A1 Check Check Module pattern defect type Regular Replace Normal Vertical by using “TILT” key Pattern? Module Line / Bar on SVC R/C ☞A13 1.Check CTRL B/D ※CTRL B/D: Control board Vertical...
  • Page 30 Repair Process B. Power Problem Making PDP TV Symptom No Power (Not turn on) 6/10 Revision ☞A26 DC Power on Repair/Replace Check Check Power LED by pressing Power Key Normal Normal IR B/D Power LED R/C IR Operation On Remote control .
  • Page 31 Repair Process B. Power Problem Making PDP TV Symptom Turn off (Instant, under watching) 7/10 Revision ☞A8~A11 ※ To check Power B/D Protection 1. Check Y-Sus/ Z-Sus Board Instant Turn on after pull out connector Power LED (especially Short or Open) between Power B/D &...
  • Page 32 Repair Process C. Sound Problem Making PDP TV Symptom No sound/ Sound distortion 8/10 Revision 1.No sound( If HDMI Input only have no sound, upload EDID data) Close ☞A25 Check Check Speaker Apply Normal Normal Normal “Speaker ON/Off” setting jack connection SVC Bulletin Sound? Sound?
  • Page 33 Repair Process D. General Function Problem Making PDP TV Symptom Remote control & Local Key & RF emitter checking 9/10 Revision 1. Remote controller (R/C) operating error Replace Main B/D ☞A26 ☞A26 ☞A26 Check & Repair Check R/C itself Normal Normal Check B+ 5V Normal...
  • Page 34 Repair Process D. General Function Problem Making PDP TV Symptom Remote control & Local Key & RF emitter checking 10/10 Revision 3. RF emitter operating error Check RF Check the signal Normal Display Check the RF emitter emitter Close between the RF emitter Signal? normally SW Ver.
  • Page 35 PDP TV Repair Process Reference data Index Symptom Detail Page Remark Check Module pattern by Tilt key Audio check method Check Va, Vs on Power Board PDP Module Label Information Check & Adjust –VY,VSC,VZB voltage - 50R3 –VY,VSC(Y-Sus) / VZB(Z-Sus) Video Check Method Fuse Checking Method Y-Sus Board Checking Method(50R3)
  • Page 36 PDP TV Repair Process Reference data Index Symptom Detail Page Remark Defect type cause by PDP Module Picture Problem Connector Type on PDP Module RF Signal level Checking method Check voltage on Power board Power board Checking Method Power Problem Check Power off History Sound Problem Speaker cable checking method...
  • Page 37 Repair Process-Reference data A. Picture Problem Symptom Making PDP TV Item Check Module pattern by Tilt key Revision Tilt Key You can see 20 types patterns by using TILT Key on SVC Remote controller (except Old model) < CHECK Item > 1.
  • Page 38 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Audio check method Revision Jack for Speaker connection 1.Check Audio output by using oscilloscope 2.Check whether speaker jack was inserted properly or not. GND ↔ R- or R+ or L- or L+ Audio output waveform ©...
  • Page 39 Repair Process-Reference data Making Input PDP TV All Input Audio Problem Block A2-1 Revision Make sure you can’t hear any audio Check speaker for damage. Replace the Speaker Check Connector Replace P301 P301 Check IC303 Power Check 17V (P600 #1,2), 17V(C340), 3.3V(R365,R374) 3.3V (IC606 #2) Check...
  • Page 40 Repair Process-Reference data Making Input PDP TV Digital TV / HDMI Audio Problem Block A2-2 Revision ◆ Digital TV Follow procedure digital TV Check video output video trouble shooting Follow procedure All source audio trouble shooting ◆ HDMI Follow procedure HDMI video Check video output trouble shooting Check EDID Download...
  • Page 41 Repair Process-Reference data Making Input PDP TV Analog TV Audio Problem Block A2-3 Revision Follow procedure analog TV Check video output video trouble shooting Check #3 on TU300 for 5V Check IC605 output Voltage Check SIF signal C301 Replace TU300 Check SIF signal (C301) Check SIF line Follow procedure All source audio...
  • Page 42 Repair Process-Reference data Making Input PDP TV Component / AV/RGB Audio Problem Block A2-4 Revision Check Connector and cables JK210(Component) Replace connector or JK100, JK101 (SCART) cable if found damaged JK208 (RGB) JK207 (Side AV) Check signal JK210 (Component) : R261, R262 JK100, JK101 (SCART) : R128, R131, R193, Replace the Resistor R194...
  • Page 43 Repair Process-Reference data Making Input PDP TV Optical Audio Problem Block A2-5 Revision Check Signal (JK204 #3) Check P601 Output Check 5V #2 on JK204 (L604,L605) Check SPDIF signal (R296) Replace MSTAR(IC400) < SPDIF waveform – sample > - Defend on the input signal. ©...
  • Page 44 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Check Va, Vs on Power Board Revision ▶ Check Va & Adjust Va Voltage (Refer to the Module label for Va specification) Z-Sus Board Power Board PDP Module Label ▶ Check Vs & Adjust Vs Voltage (Refer to the Module label for Vs specification) Y-Sus Board Check Va...
  • Page 45 ③ Manugacture No. ⑫ Max. Watt ④ Adjusting Voltage(DC Va, Vs) ⑬ Max. Volts ⑤ Adjusting Voltage (Set up/-Vy/Vsc/Ve/Vzb) ⑭ Max. Amps ⑥ The trade name of LG Electronics ⑦ Manufactured date(Year & Month) ⑧ Warning © Copyright Internal Only...
  • Page 46 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Check & Adjust –V voltage(50R3) Revision Voltage Check & Adjustment : 50R3 YSUS board <Module Label> Vsc adjustment Fuses -Vy adjustment Vy Vsc 1. Vsc (150V) on Y-Sus B/D - Check Point: R324 - Adjustment Point: VR301...
  • Page 47 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Check & Adjust –V voltage(50R3) Revision Voltage Check & Adjustment : 50R3 ZSUS board ZSUS board <Module Label> Vzb adjustment Vy Vsc 3. VZB (115V) on Z-Sus B/D . Check Point: R156 - Adjustment Point: VR204...
  • Page 48 Repair Process-Reference data Making Input PDP TV Digital TV Video Problem Block A6-1 Revision Check RF Cable Check Voltage Check TU300 Power 5V : IC605 Output 5V(C304), 3.3V(C302), 3.3V : IC600 Output 1.2V(C300) 1.2V:IC301 Output Check Monitor Out Video Check Video color Replace Tuner (Scart out) Check IIC Line...
  • Page 49 Repair Process-Reference data Making Input PDP TV Analog TV Video Problem Block A6-2 Revision Check RF Cable Check 5V voltage Check IC605 Output on TU300(Pin3) Voltage(L610) Check CVBS signal Replace Tuner(TU300) TU601 #11 Pin Replace MSTAR(IC400) < CVBS waveform – sample > - Defend on the input signal.
  • Page 50 Repair Process-Reference data Making Input PDP TV Component Video Problem Block A6-3 Revision Check input signal format Is it supported? Check Component Cable Check signal Check the damage of JK210 on R411,C413,C415 And Replace Connector Replace MSTAR(IC400) ※ Measured signals depend on the input signal. ©...
  • Page 51 Repair Process-Reference data Making Input PDP TV RGB(D-Sub) Video Problem Block A6-4 Revision Check input signal format Is it supported? Check RGB Cable conductors for damage Check P205 Replace connector (P205). Check signal, Hsync, Vsync R218, R219 Check signal Replace R404, R406, R408 R404, R406, R408 Replace MSTAR(IC400) ※...
  • Page 52 Repair Process-Reference data Making Input PDP TV AV Video Problem Block A6-5 Revision Check input signal format Is it supported? Check AV Cable for damage or open conductors Check AV port of JK207(Side), Replace connector JK100,JK101(Rear) Check signal line JK207-Video : C425 Replace Capacitor JK100-Video : C408,C410,C412(RGB), C423(CVBS)
  • Page 53 Repair Process-Reference data Making Input PDP TV HDMI Video Problem Block A6-6 Revision Check input signal format Is it supported? Check HDMI Cable for damage or open conductors Check EDID D/L Re-Download EDID Check JK200 / J201 / J202 Replace Connector for proper connection or damage Replace MSTAR(IC400) ©...
  • Page 54 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Fuse Checking Method Revision < DMM mode > Pic. 1. Fuse check Pic. 1. Pic. 2. 1) Sound comes, the fuse is OK. 2) If Fuse is defects, it should check again voltage of 5V, Va, Va after replacing the fuse. 3) In case there are no voltage of 5V, Va, Vs, the board is failure, it need to replace the board.

  • Page 55: Specifications

    Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Y-Sus Board Checking Method(50R3) Revision ▣ Check Method YSUS board ① Check input voltages(5V, Va, Vs) at P103 connector. ② Check it is short or not between Vs and GND at P103 connector. ③...
  • Page 56 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Z-Sus Board Checking Method(50R3) Revision ① Check input voltages(5V, Va, Vs) at P203 connector. ② Check it is short or not between Vs and GND at P203 connector. ZSUS board P203 ③...
  • Page 57 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Check 5V, 17V on Power B/D Revision Power Board P813 P600 P813 ▣ Measure 5V voltage ▣ Measure 17V voltage © Copyright Internal Only...
  • Page 58 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Control Board Checking Method(50R3) Revision ▣ Checking Method ④ Check IC ( IC53, IC51 ) ① Check input voltages(5V of P105 / 18V of P2) at control IC53 IC51 board. ②...
  • Page 59 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Mal discharge Symptom Revision ▣ Dot type Mal-discharge symptom ▣ Dark picture caused by Mal-discharge ▣ Scan type Mal-discharge symptom © Copyright Internal Only...
  • Page 60 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom PDP Module Rom Ver. Checking method Revision ▣ Check by using Rom Label on control board Rom ver. Label ▣ Check by using SVC Remote controller ※Refer to the Module Rom upgrade manual Press “In-start”...
  • Page 61 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Y Drive B/D Checking method(50R1) Revision ▣ Y drive board Scan IC ※ DMM (Digital Multi-Meter) Input signal connector ※ Check all output pins of scan IC (connector) using DMM. ©...
  • Page 62 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom (Half picture) X- B/D Checking method(50R1) Revision ▣ Half / partly display (or abnormal display) Picture 1. Picture 2. Picture 3. -. Check Va input voltage. abnormal (P121, P120, P220, P221, P320 : Power connector of the X board) Half -.
  • Page 63 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Defect type cause by PDP Module Revision First of all, Check whether all of cable between board was inserted properly or not. Next, Check whether there is foreign material on connector. Symptom picture defects description To action...
  • Page 64 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom Connector Type on PDP Module Revision COF Type TCP Type FFC Type 96 Out Put 192 Out Put 1. Check foreign & Connection status TCP (Tape Carrier Package) is film Connector to connect between 2.
  • Page 65 Repair Process-Reference data A. Picture Problem Making PDP TV Symptom RF Signal level Checking method Revision ◆ MENU Press Red Button on R/C Singal TEST -> Diagnostics 1. Check whether Signal Strength, Signal Quality is over 50% or not. 2. If Signal Strength, Signal Quality is under 50%,install the Booster to increase signal level. ©...
  • Page 66 Repair Process-Reference data B. Power Problem Making PDP TV Symptom Check voltage on Power board Revision P813 Pin Map Checking Order Checking Order Power B/D↔Main B/D Checking Spec Remark Point STBY AC DET High(3.3V~5V) RL_ON High(3.3V~5V) M_ON High(3.3V~5V) © C o p y r i g h t L G E I n t e r n a l U s e...
  • Page 67 Repair Process-Reference data B. Power Problem Making PDP TV Symptom Power board Checking Method Revision P811 Power B/D↔ Y-Sus B/D(P811) ◆ Check 5V,Va,Vs voltage : For Voltage specification, refer to the PDP Module Label. NAME Vs adjust Va adjust SC101 P813 Va Voltage ADJ ◆...
  • Page 68 Repair Process-Reference data B. Power Problem Making PDP TV Symptom Check Power off History Revision ▣ Check Power off History by using SVC Remote controller Press “In-start” →Press” 0000” → Select “Power Off History” → Pop up Module Rom ver. Appear Power off history 5ea.
  • Page 69 Repair Process-Reference data C. Sound Problem Making PDP TV Symptom Speaker cable checking method Revision Jack for Speaker connection Speaker 1.Check whether speaker jack was inserted properly on Main B/D side & speaker side or not. 2. Check whether speaker cable have problem (disconnection wire) or not. ©...
  • Page 70 Repair Process-Reference data D. General function defect Making PDP TV Symptom Check Remote control IR operation Revision KEY1 KEY2 LED-RED 3.3V ST TOUCH_VER_CHK IR Board ▣ Checking method 1.Check connector was inserted properly on Main board and IR board. 2. Check +3.3V_ST Voltage at Pin10 3.
  • Page 71 Repair Process-Reference data D. General function defect Making PDP TV Symptom Check Local Key operation KEY1 KEY2 LED-RED 3.3V ST TOUCH_VER_CHK Power Vol+ Vol- Menu Input 1.Check connector was inserted properly on Main board and IR board. 2. Check whether appear voltage on multi meter when operate Local switch.
  • Page 72 Repair Process-Reference data D. General function defect Making PDP TV Symptom Check RF emitter operation +3.3V 3D_RF_RXD 3D_RF_TXD 3D_RFMODULE_RESET 3D_RFMODULE_DC 3D_RFMODULE_DD 3D_RF_GPIO0 3D_RF_GPIO1 3D_RF_GPIO2 3D_L/R_SYNC 1.Check connector was inserted properly on Main board and RF emitter board. 2. Check whether appear voltage on multi meter when operate RF emitter board.

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