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LG 50PW450 Service Manual
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LG 50PW450 Service Manual

Chassis: pd11a
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PLASMA TV
SERVICE MANUAL
CHASSIS : PD11A
MODEL : 42PW450 /450A/450N/450T
MODEL :
CAUTION
42PW451 /451A
42PW450/450A/450N/450T-ZA/
42PW451/451A-ZD

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Summary of Contents for LG 50PW450

  • Page 1 PLASMA TV SERVICE MANUAL CHASSIS : PD11A MODEL : 42PW450 /450A/450N/450T MODEL : 42PW451 /451A 42PW450/450A/450N/450T-ZA/ 42PW451/451A-ZD CAUTION...
  • Page 4 SPECIFICATION NOTE Application Range Specification Test Method Module Specification...

  • Page 15: Exploded View

    EXPLODED VIEW IMPORTANT SAFETY NOTICE...
  • Page 16 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 17 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 18 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 19 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 20 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 21 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 22 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 24 PDP TV Repair Guide < Applicable Model > - 50/60PZ550 ⓒ LG Electronics. Inc.2010...
  • Page 25 Turn off (Instant, under watching) C. Sound Problem No sound/ Sound distortion Remote control & Local Key checking E. General function Problem RF emitter checking First of all, Check whether there is SVC Bulletin in GCSC System for these model. ⓒ LG Electronics. Inc.2010...
  • Page 26 .Check B+(5V) 2.Replace Control B/D ☞A8~A11 Move Move 1. Check Y-Sus/ Z-Sus Board Power problem Power problem Section 2. Replace defective B/D Section ※Refer to the Module label for each voltage ☞A4 <SVC R/C & Pattern> ⓒ LG Electronics. Inc.2010...
  • Page 27 Bulletin? in OSD Menu & Speaker Cable open (S/W Upgrade etc) Check 17V Close Normal Check Power B/D Close (Audio IC B+) voltage? Replace Power B/D on Power B/D Check Audio IC Short Replace Main B/D ⓒ LG Electronics. Inc.2010...
  • Page 28 ☞A6-1, 2 Check RF Cable Normal Check Tuner Picture Noise Connection Picture? & Replace Close ☞A9 Check Replace Normal 1. Check Z-Sus Board Normal Picture mode Dark Picture Module Picture? 2. Replace Board Picture? setting Close Close ⓒ LG Electronics. Inc.2010...
  • Page 29 Normal On→Off: Check Close Picture? S/W Version Bulletin? Picture? Off→On: Check ☞A6-1, 2 S/W Upgrade Check Close Tuner & replace Main B/D Normal Picture? Contact with signal distributor or Normal broadcaster Picture? (Cable or Air) Close ⓒ LG Electronics. Inc.2010...
  • Page 30 1. Check Y Drive B/D Normal 1.Check CTRL B/D Normal of Connector (FFC) Normal Module 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 ⓒ LG Electronics. Inc.2010...
  • Page 31 AC DET Signal RL_ON Signal Normal Voltage? Signal? Signal? Output voltage Power B/D on 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 ⓒ LG Electronics. Inc.2010...
  • Page 32 KEY Off Check This is not problem “Off Timer” Under watching Power Off History Set? Normal operation 2HOUR Off NO Signal Off “Off timer” Function off Move Don’t appear No Power problem Power Off History Section ⓒ LG Electronics. Inc.2010...
  • Page 33 (By connecting same output cable of other equipment) Bulletin? (S/W Upgrade etc) → DVD Player ,Set-Top-Box, different maker TV etc 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) ⓒ LG Electronics. Inc.2010...
  • Page 34 2. Local KEY operating error Replace Main B/D ☞A27 ☞A27 Check local Check & Repair Normal Normal Check Key Normal Cable connection operating? operating? Output signal Signal? Operation Connector solder Close Repair/Replace Move Local Key B/D Power problem Section ⓒ LG Electronics. Inc.2010...
  • Page 35 RF emitter Signal? normally SW Ver. at SVC menu Operation and Mani board ☞A28 ☞A28 Check & Repair Normal Replace RF Normal Cable connection operating? operating? emitter board Connector solder Replace Close Main B/D ⓒ LG Electronics. Inc.2010...
  • Page 36 Z-Sus Board Checking Method(50R3) Check 5V on Power B/D Picture Problem Control Board Checking Method(50R3) 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 ⓒ LG Electronics. Inc.2010...
  • Page 37 Check voltage on Power board Power board Checking Method Power Problem Check Power off History Sound Problem Speaker cable checking method Check Remote control IR operation General Function Problem Check Local Key operation Check RF emitter operation ⓒ LG Electronics. Inc.2010...
  • Page 38 < CHECK Item > 1. Dead pixel 2.Image sticking 3.Mal discharge 4.Module defect (V-Line/Bar, H-Line/Bar,,,) 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 ⓒ LG Electronics. Inc.2010...
  • Page 39 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 ⓒ LG Electronics. Inc.2010...
  • Page 40 Check IC700 Status Reset (R380) / PDN (R374) PDN(#23) / Reset(#31) is High? :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) ⓒ LG Electronics. Inc.2010...
  • Page 41 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 Re-download EDID data Follow procedure All source audio trouble shooting ⓒ LG Electronics. Inc.2010...
  • Page 42 Check SIF signal C301 Replace TU300 Check SIF signal (C301) Check SIF line Follow procedure All source audio < SIF waveform – sample > trouble shooting - Defend on the input signal. Replace MSTAR IC (IC400) ⓒ LG Electronics. Inc.2010...
  • Page 43 Check IC400 signal JK210 (Component) : C441, C442 JK100, JK101 (SCART) : C435, C436, C437, Replace the Capacitor C438 JK208 (RGB) : C443, C444 JK207 (Side AV) : C439, C440 Follow procedure All source audio trouble shooting ⓒ LG Electronics. Inc.2010...
  • Page 44 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. ⓒ LG Electronics. Inc.2010...
  • Page 45 Power Board PDP Module Label ▶ Check Vs & Adjust Vs Voltage (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) ⓒ LG Electronics. Inc.2010...
  • Page 46 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 ⓒ LG Electronics. Inc.2010...
  • Page 47 <Module Label> Vsc adjustment Fuses -Vy adjustment Vy Vsc 1. Vsc (150V) on Y-Sus B/D - Check Point: R324 - Adjustment Point: VR301 2. -Vy (-190V) on Y-Sus B/D - Check Point: R334 - Adjustment Point: VR302 ⓒ LG Electronics. Inc.2010...
  • Page 48 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 ⓒ LG Electronics. Inc.2010...
  • Page 49 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 Check TU_SCL/SDA Line Check other input / OSD Check Module Change MSTAR(IC400) ⓒ LG Electronics. Inc.2010...
  • Page 50 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. ⓒ LG Electronics. Inc.2010...
  • Page 51 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. ⓒ LG Electronics. Inc.2010...
  • Page 52 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) ※ Measured signals depend on the input signal. ⓒ LG Electronics. Inc.2010...
  • Page 53 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) ※ Measured signals depend on the input signal. Replace MSTAR(IC400) ⓒ LG Electronics. Inc.2010...
  • Page 54 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) ⓒ LG Electronics. Inc.2010...
  • Page 55 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. ⓒ LG Electronics. Inc.2009...

  • Page 56: Specifications

    HS601 Forward 0.35V ~ 0.45V 0.45V~0.55V 0.45V~0.55V Reverse O.L. (Overload) D604,D605 Q601,Q602 HS602 Forward 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) ⓒ LG Electronics. Inc.2009...
  • Page 57 Q107, Q110 Q106, Q109 HS101 Forward 0.35V ~ 0.45V 0.35V ~ 0.45V 0.35V ~ 0.45V Reverse O.L. (Overload) D109,D110,D108,D111 Q104,Q113,Q114 Q102,Q103 0.35V ~ 0.45V 0.5V ~ 0.6V 0.45V~0.55V HS102 Forward Reverse O.L. (Overload) FS202 5V fuse ⓒ LG Electronics. Inc.2009...
  • Page 58 Repair Process-Reference data A. Picture Problem 전자 - 6-2 Making 2010. 11. 16 PDP TV Symptom Check 5V, 17V on Power B/D Revision Power Board P813 P600 P813 ▣ Measure 5V voltage ▣ Measure 17V voltage ⓒ LG Electronics. Inc.2009...
  • Page 59 ② Check LED On ③ Check Crystal(X1) Check oscillation of Crystal (Normal: 25 MHZ) ⑤ Check MCM P2(18V) Pin14, 15 P105_FL1,FL2(5V) MCM Check point (+)VS_DA / (-) GND Pin 14,15 : 18V (Normal: 3.3V ) ① Check Input voltage ⓒ LG Electronics. Inc.2009...
  • Page 60 Repair Process-Reference data A. Picture Problem 전자 - 6-2 Making 2010. 11. 16 PDP TV Symptom Mal discharge Symptom Revision ▣ Dot type Mal-discharge symptom ▣ Dark picture caused by Mal-discharge ▣ Scan type Mal-discharge symptom ⓒ LG Electronics. Inc.2010...
  • Page 61 Rom ver. Label ▣ Check by using SVC Remote controller Press “In-start” →Press ”0413” ※Refer to the Module Rom upgrade manual → Select Panel Control → Check Module Rom ver. for Rom upgrade. USB Type Jig ⓒ LG Electronics. Inc.2010...
  • Page 62 2010. 11. 16 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. ⓒ LG Electronics. Inc.2010...
  • Page 63 -. Both ends display (Picture 2.) ↔ Check/replace center X B/D (abnormal) -. 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 ⓒ LG Electronics. Inc.2010...
  • Page 64 1. Check connection (CTRL B/D, X B/D) Many irregular vertical lines 2. Check CTRL B/D 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 ⓒ LG Electronics. Inc.2010...
  • Page 65 TCP (Tape Carrier Package) is film Connector to connect between 2. Check bad soldering for 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 ⓒ LG Electronics. Inc.2010...
  • Page 66 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. ⓒ LG Electronics. Inc.2010...
  • Page 67 전자 - 6-2 Making 2010. 11. 16 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) ⓒ LG Electronics. Inc.2010...
  • Page 68 ③ Check FUSE. ④ Check 5V,Va,Vs voltage Adjust way ※ 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. ⓒ LG Electronics. Inc.2010...
  • Page 69 Power off by Remote control KEY OFF Mechanical power switch off 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 ⓒ LG Electronics. Inc.2010...
  • Page 70 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. ⓒ LG Electronics. Inc.2010...
  • Page 71 3. Check whether appear voltage on multi meter when operate remote control. ※ Test Condition for case 3 → Check Point: Pin 1( IR) → TV: power on status → Multi meter: Select DC 10V IR & Local key Board for 2/3/4/550 TOOL ⓒ LG Electronics. Inc.2010...
  • Page 72 2. Check whether appear voltage on multi meter when operate Local switch. ※ Test Condition for case 3 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 ⓒ LG Electronics. Inc.2010...
  • Page 73 2. Check whether appear voltage on multi meter when operate RF emitter board. ※ Test Condition for case 3 → Check Point: Pin 12 → TV: power on status → Multi meter: Select DC 10V RF emitter Board ⓒ LG Electronics. Inc.2010...

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