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LG 50PT350-ZK Service Manual
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LG 50PT350-ZK Service Manual

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PLASMA TV
SERVICE MANUAL
CHASSIS : PD13K
MODEL : 50PT350/351/351A/351N/352/
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67289501(1108-REV00)
50PT353/353A/353K/353N
50PT350-ZK/50PT351-ZJ/50PT352-ZH/
50PT353-ZG/50PT351A/351N-ZJ/
50PT353A/353K/353N-ZG
North/Latin America
Europe/Africa
Asia/Oceania
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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Questions and answers

Koivisto hannu
April 9, 2025

Käykö lg50pt353n-zg HDTV kanavien katseluun digiboksin kautta joka toistaa HD kanavia

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1 comments:
Mr. Anderson
April 10, 2025

Yes, the LG 50PT350-ZK HDTV can be used to watch HD channels through a set-top box.

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Summary of Contents for LG 50PT350-ZK

  • 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 : 50PT350/351/351A/351N/352/ 50PT353/353A/353K/353N 50PT350-ZK/50PT351-ZJ/50PT352-ZH/ 50PT353-ZG/50PT351A/351N-ZJ/ 50PT353A/353K/353N-ZG CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Printed in Korea P/NO : MFL67289501(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 - 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 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 E. General function Problem RF emitter checking First of all, Check whether there is SVC Bulletin in GCSC System for these model. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Power problem Section Section 2. Replace defective B/D ※Refer to the Module label for each voltage ☞A4 <SVC R/C & Pattern> Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Check Power B/D Normal Close (Audio IC B+) voltage? Replace Power B/D on Power B/D Check Audio IC Short Replace Main B/D Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Check Replace Normal 1. Check Z-Sus Board Normal Picture mode Dark Picture Module Picture? 2. Replace Board Picture? setting Close Close Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Check Close Tuner & replace Main B/D Normal Picture? Contact with signal distributor or Normal broadcaster Picture? (Cable or Air) Close Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Line/Bar 2. Replace Board Picture? 2.Replace Board Picture? on Y Drive B/D Close Close 1.Connector re-connection 2.Eliminate foreign material on FFC Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 Power B/D on Power B/D on Power B/D ☞A23 Close Check Power B/D Check Main B/D Replace Power B/D Replace Main B/D Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Normal operation 2HOUR Off NO Signal Off “Off timer” Function off Move Don’t appear No Power problem Power Off History Section Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Check Audio IC Explain customer that Replace Main B/D Cause is RF Signal’s problem (Case 1) Cause is Equipment’s problem (case 2) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 Normal Normal Cable connection operating? operating? Output signal Signal? Operation Connector solder Close Repair/Replace Move Local Key B/D Power problem Section Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 ☞A28 ☞A28 Check & Repair Normal Replace RF Normal Cable connection operating? operating? emitter board Connector solder Replace Close Main B/D Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Mal discharge Symptom Picture PDP Module Rom Ver. Checking method Y Drive B/D Checking method (Half picture) X- B/D Checking method(50R3) Next page Continued Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 Sound Problem Speaker cable checking method Check Remote control IR operation General Function Problem Check Local Key operation Check RF emitter operation Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 5. In case of no picture, you can judge defect cause (Module or Main B/D) - If patterns appear, defect cause is Main B/D Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 2.Check whether speaker jack was inserted properly or not. GND ↔ R- or R+ or L- or L+ Audio output waveform Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 :They must be High (3.3V) Check SCL,SDA Replace R359, R360 R359, R360 Check Mstar I2S Output Replace MSTAR(IC400). #27,28, 29, 30 on IC303 Replace AMP(IC303) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 Follow procedure HDMI video Check video output trouble shooting Check EDID Download Re-download EDID data Follow procedure All source audio trouble shooting Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 Follow procedure All source audio < SIF waveform – sample > trouble shooting - Defend on the input signal. Replace MSTAR IC (IC400) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 Replace the Capacitor C438 JK208 (RGB) : C443, C444 JK207 (Side AV) : C439, C440 Follow procedure All source audio trouble shooting Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Check 5V #2 on JK204 (L604,L605) Check SPDIF signal (R296) Replace MSTAR(IC400) < SPDIF waveform – sample > - Defend on the input signal. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 (Refer to the Module label for Vs specification) Y-Sus Board Check Va Check Vs Vs Adjustment Control Board (VR901) Va Adjustment Main Board (VR502) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 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 © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 46 - Check Point: R324 - Adjustment Point: VR301 2. -Vy (-190V) on Y-Sus B/D - Check Point: R334 - Adjustment Point: VR302 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 ZSUS board <Module Label> Vzb adjustment Vy Vsc 3. VZB (115V) on Z-Sus B/D . Check Point: R156 - Adjustment Point: VR204 Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 Check Video color Replace Tuner (Scart out) Check IIC Line Check TU_SCL/SDA Line Check other input / OSD Check Module Change MSTAR(IC400) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 Check CVBS signal Replace Tuner(TU300) TU601 #11 Pin Replace MSTAR(IC400) < CVBS waveform – sample > - Defend on the input signal. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Check signal Check the damage of JK210 on R411,C413,C415 And Replace Connector Replace MSTAR(IC400) ※ Measured signals depend on the input signal. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 R218, R219 Check signal Replace R404, R406, R408 R404, R406, R408 Replace MSTAR(IC400) ※ Measured signals depend on the input signal. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 Check signal line JK207-Video : C425 Replace Capacitor JK100-Video : C408,C410,C412(RGB), C423(CVBS) ※ Measured signals depend on the input signal. Replace MSTAR(IC400) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Check EDID D/L Re-Download EDID Check JK200 / J201 / J202 Replace Connector for proper connection or damage Replace MSTAR(IC400) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 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. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only...
  • Page 55 0.35V ~ 0.45V 0.45V~0.55V Reverse O.L. (Overload) D602 Q603,Q605 Q610,Q612 HS603 Forward 0.35V ~ 0.45V 0.35V ~ 0.45V 0.4V~0.5V Reverse O.L. (Overload) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 Reverse O.L. (Overload) D109,D110,D108,D111 Q104,Q113,Q114 Q102,Q103 HS102 0.35V ~ 0.45V 0.5V ~ 0.6V 0.45V~0.55V Forward Reverse O.L. (Overload) FS202 5V fuse Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Symptom Check 5V, 17V on Power B/D Revision Power Board P813 P600 P813 ▣ Measure 5V voltage ▣ Measure 17V voltage Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Pin14, 15 P105_FL1,FL2(5V) MCM Check point (+)VS_DA / (-) GND Pin 14,15 : 18V (Normal: 3.3V ) ① Check Input voltage Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Symptom Mal discharge Symptom Revision ▣ Dot type Mal-discharge symptom ▣ Dark picture caused by Mal-discharge ▣ Scan type Mal-discharge symptom Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 ※Refer to the Module Rom upgrade manual Press “In-start” →Press ”0413” → Select Panel Control → Check Module Rom ver. for Rom upgrade. USB Type Jig Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Y drive board Scan IC ※ DMM (Digital Multi-Meter) Input signal connector ※ Check all output pins of scan IC (connector) using DMM. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 -. Left display (Picture 3.) ↔ Check/replace left X B/D ※ Check connections (TCP - X board, CTRL board - X board) from CTRL from CTRL from CTRL Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 3. Replace CTRL B/D 1. Check connection (Y-Sus B/D ↔Panel) Horizontal Line or Bar 2. Check Y-Sus B/D 3. Replace Y-Sus B/D Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 IC connect with Electrode pattern Electrode PAD Of PANEL and on Chip resistance (Direct Bonding) on X B/D Y Drive B/D,Z-Sus B/D ▣ Defect symptom Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 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. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only...
  • Page 66 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) Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 ※ PSU Maker: 1) LGIT 2) LITEON 3) YUYANG ※ If happen Power board Protection, check whether there is Short or Open on Y-SUS, Z-SUS B/D or not. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 After turn on by OnTimer, There is no operation 2HOUR OFF for 2hours NO SIGNAL OFF In case that there is no signal for 15minutes Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 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. Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only...
  • Page 70 → Check Point: Pin 1( IR) → TV: power on status → Multi meter: Select DC 10V IR & Local key Board for 2/3/4/550 TOOL Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 IR & Local key Board for 2/3/4/550 TOOL → Check Point: Pin 2,3( Key1,Key2) → TV: power on status → Multi meter: Select DC 10V Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 ※ Test Condition for case 3 → Check Point: Pin 12 → TV: power on status → Multi meter: Select DC 10V RF emitter Board Copyright © 2011 LG Electronics Inc. All rights reserved. LGE Internal Use Only Only for training and service purposes...

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