LG 42PT450 Service Manual Download

Page: 71 / 73

ⓒ

LG Electronics. Inc.2010

Making

전자

- 6-2

Revision

PDP TV

Symptom

D. General function defect

Repair Process-Reference data

1.Check connector was inserted properly

on Main board and IR board.

2. Check +3.3V_ST Voltage at Pin10

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

▣

Checking method

Check Remote control IR operation

IR & Local key Board for 2/3/4/550 TOOL

IR Board

A26

TOUCH_VER_CHK

GND

KEY1
KEY2

LED-RED

GND

SCL

SDA

GND

3.3V ST

2010. 11. 16

Summary of Contents for 42PT450

Page 1: ...THIS MANUAL CHASSIS PD11A MODEL 42PW450 450A 450N 450T MODEL 42PW451 451A 42PW450 450A 450N 450T ZA 42PW451 451A ZD North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO MFL66306703 1101 REV00 ...

Page 2: ... Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 6 BLOCK DIAGRAM 14 EXPLODED VIEW 15 CIRCUIT DIAGRAM ...

Page 3: ...t s Neck Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed met...

Page 4: ...evice 106 cm 42 inch wide Color Display Module PDP 2 Aspect Ratio 16 9 3 PDP Module PDP42T3 RGB Closed Well Type Glass Filter 38 Pixel Format 1024 horiz By 768 ver 4 Operating Environment 1 Temp 0 deg 40 deg 2 Humidity 20 80 5 Storage Environment 3 Temp 20 deg 60 deg LGE SPEC 4 Humidity 10 90 6 Input Voltage AC 100 V 240 V 50 60 Hz Maker LG Model Name 42PW450 ZA 42PW450A ZA 42PW450N ZA 42PW450T ZA...

Page 5: ... Portugal Romania Russia Serbia Slovenia Spain Sweden Slovakia Switzerland Turkey Ukraine UK 2 Broadcasting system 1 PAL SECAM BG EU PAL Market 2 PAL SECAM DK 3 PAL Ⅰ Ⅱ 4 SECAM L L 5 DVB T 6 DVB C 3 Receiving system Analog Upper Heterodyne Digital COFDM 4 Scart Jack 1EA PAL SECAM 5 Video Input 1EA PAL SECAM NTSC Side AV 6 Component Input 1EA Y Cb Cr Y Pb Pr 7 RGB Input RGB PC Analog D Sub 15Pin 8 ...

Page 6: ...HEAT RUN MODE 1 Press the POWER ON KEY on R C for adjustment 2 OSD display and screen display PATTERN MODE Set is activated HEAT run without signal generator in this mode Single color pattern WHITE of HEAT RUN MODE uses to check panel Caution If you turn on a still screen more than 20 minutes Especially digital pattern cross hatch pattern an after image may be occur in the black level part of the ...

Page 7: ...ey at 5 ADC Calibration Caution Using power on button of the Adjustment R C power on TV Model Module Tool Tool Tool Tool Tool option1 option2 option3 option4 option5 50PZ550 ZA 50R3 36928 37966 54144 26956 32 60PZ550 ZA 60R3 49216 37966 54144 26956 32 60PZ250 ZA 60R3 49280 37966 54144 26892 32 50PZ250 ZA 50R3 36992 37966 54144 26892 32 50PW450 ZA 50T3 37056 37966 54144 26892 32 42PW450 ZA 42T3 247...

Page 8: ... start by execute RS232C Command O Color temperature standards according to CSM and Module O CS 1000 CA 100 CA 210 CH 10 White balance adjustment coordinates and color temperature Connecting picture of the measuring instrument On Automatic control 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 wil...

Page 9: ...icture Mode change Vivid Vivid User 7 3 DPM operation confirmation Only Apply for MNT Model Check if Power LED Color and Power Consumption operate as standard 1 Set Input to RGB and connect D sub cable to set 2 Measurement Condition 100 240V 50 60Hz 3 Confirm DPM operation at the state of screen without Signal 7 4 DDC EDID Write RGB 128Byte Not used any more Use Auto D L 1 Connect D sub Signal Cab...

Page 10: ...xists Caution Never connect HDMI D sub Cable at the same time Use the proper cables below for EDID Writing Download HDMI1 HDMI2 separately because HDMI1 is different from HDMI2 7 9 EDID DATA 1 3D HD RGB EDID data 2 3D HD HDMI1 EDID data 3 3D HD HDMI2 EDID data 4 3D HD HDMI3 EDID data ⓐ Vender ID O Checksum Changeable by total EDID data No Item Condition Hex Data 1 Manufacturer ID GSM 1E6D 2 Versio...

Page 11: ...n Generator MSPG 3233 HDMI mode NO 371 pattern No 81 1 Please input 3D test pattern like below 2 Enter 3D mode then select side by side If you don t wear a 3D Glasses you will see the picture like below 3 Put on the 3D Glasses And block the right side of Glasses LEFT OPEN TEST RIGHT CLOSED And check the middle sides of picture RED normal others abnormal 4 Put on the 3D Glasses And block the right ...

Page 12: ...y by D book 4 0 Manual Download Model Name and Serial Number If the TV set is downloaded By OTA or Service man Sometimes model name or serial number is initialized Not always There is impossible to download by bar code scan so It need Manual download 1 Press the instart key of ADJ remote controller 2 Go to the menu 5 Model Number D L like below photo 3 Input the Factory model name ex 42LD450 TA or...

Page 13: ... Download Guide Put a bin to USB Stick and Turn on TV 1 Put the USB Stick to the USB socket 2 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is Low it didn t work But your downloaded version is High USB data is automatically detecting 3 Show the message Copying files from memory 4 Updating is staring 5 0 Updating Completed The TV will restart autom...

Page 15: ... 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 Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE A10 A9 LV1 A12 A21 A2...

Page 16: ...A 0 CI_ADDR 7 CI_DET CI_ADDR 8 PCM_A 1 CI_CD1 PCM_A 14 CI_CD2 CI_ADDR 5 CI_IOWR CI_DET CI_OE CI_TS_DATA 1 R113 100 EU BUF_FE_TS_CLK AR109 33 EU JK104 10067972 000LF EU EAG41860102 G1 G2 57 21 52 16 10 47 41 5 36 59 23 45 54 18 49 43 13 7 38 2 25 56 20 51 15 9 46 40 4 35 58 22 53 17 11 48 42 12 6 37 1 24 55 19 50 44 14 8 39 3 26 60 27 61 28 62 29 63 30 64 31 32 33 34 65 66 67 68 69 PCM_IOWR CI_TS_V...

Page 17: ...01 4A YL O SPRING 5A YL E LUG 3A YL CONTACT 4B WH O SPRING 3C RD CONTACT 4C RD O SPRING 5C RD E LUG C225 1000pF 50V R262 10K COMP2_R_IN C224 1000pF 50V 3 3V COMP2_L_IN R261 10K R259 470K COMP2_DET COMP2_Pb R265 12K COMP2_Pr R260 470K COMP2_Y R266 12K R264 10K COMP2_Y COMP2_Pb COMP2_Pr R286 0 R282 0 COMP2_Pr COMP2_Y COMP2_Y COMP2_Pb R284 0 R285 0 COMP2_Pr COMP2_Pb R283 0 R287 0 C228 10pF 50V READY ...

Page 18: ..._2_D R828 0 2D LVDS_DATA_2_A TE1P LVDS_DATA_1_C TB1N R800 0 2D TD1P R824 0 2D TA1N TC3P TC2N TD3N TA1N TC1N TC1P R815 0 2D PC_SER_CLK R833 0 2D TE2N TB1P TB2N R804 0 2D TE3P LVDS_DATA_1_E R812 0 2D R786 0 2D TE2P LVDS_DATA_1_C SDA_3 3V_MOD P_SCL R831 0 2D R830 0 2D LVDS_DATA_2_C R810 0 2D R822 0 2D TB1P LVDS_CLK_1 R789 0 2D TD2P UART_RXD TA2P PC_SER_DATA LVDS_DATA_2_D TCLK2N R785 0 2D 3 3V TCLK1P ...

Page 19: ... AE15 NC_33 AD2 NC_47 AD16 NC_46 AD15 NC_63 AE16 NC_66 AF3 NC_76 AF14 NC_32 AD1 NC_44 AD13 NC_61 AE14 NC_60 AE13 NC_51 AE4 NC_36 AD5 NC_67 AF4 NC_35 AD4 NC_49 AE2 NC_71 AF8 NC_40 AD9 NC_56 AE9 NC_72 AF9 NC_58 AE11 NC_69 AF6 NC_53 AE6 NC_74 AF11 NC_37 AD6 NC_43 AD12 NC_52 AE5 NC_75 AF12 NC_68 AF5 NC_59 AE12 NC_57 AE10 NC_70 AF7 NC_42 AD11 NC_38 AD7 NC_41 AD10 NC_54 AE7 NC_73 AF10 NC_39 AD8 NC_55 AE...

Page 20: ...SSQ_3 D1 VSSQ_4 D8 VSSQ_5 E2 VSSQ_6 E8 VSSQ_7 F9 VSSQ_8 G1 VSSQ_9 G9 B MDQSLB B MDQL3 B MDML B MA0 B MA7 B MWEB B TMA13 B MBA1 B TMA11 B MDMU B TMA5 B MCK B MA9 B MDQL6 B MDQSU B MDQSLB B MA1 B MBA0 B MDQU3 B MDQU5 B TMDQL0 B TMDQL1 B MA7 B TMDQU2 B MDQL5 B MDQL5 B MDQU7 B TMA2 B TMDQSLB B TMA3 B MDQL6 B TMDQSL B MDQSUB B MCKE B MCASB B MA12 B MWEB B TMBA0 B MDQU3 B MA11 B MA2 B MCKE B TMCKE B MDQ...

Page 21: ...63 10uF 16V READY C633 22uF 16V C632 22uF 16V R613 10K READY R638 10K READY C662 10uF 10V C607 47uF 6 3V C616 47uF 6 3V C659 47uF 6 3V IC606 AZ1085S 3 3TR E1 1 ADJ GND 2 OUTPUT 3 INPUT L709 BLM18PG121SN1D 3D 3 3V_3D C740 0 01uF 3D C746 10uF 10V 3D 1 8V C755 0 1uF 16V 3D C751 0 1uF 16V 3D C747 10uF 10V 3D L703 BLM18PG121SN1D 3D L710 BLM18PG121SN1D 3D C745 22uF 10V 3D 0 1uF C728 3D R775 330K 3D C739...

Page 22: ... TE4P B2 TE4N B1 TD4P B3 TD4N C3 TCLK4P C1 TCLK4N C2 TC4P D2 TC4N D1 TB4P D3 TB4N E3 TA4P E1 TA4N E2 TE3P F2 TE3N F1 TD3P F3 TD3N G3 TCLK3P G1 TCLK3N G2 TC3P H2 TC3N H1 TB3P H3 TB3N J3 TA3P J1 TA3N J2 TE2P K2 TE2N K1 TD2P K3 TD2N L3 TCLK2P L1 TCLK2N L2 TC2P M2 TC2N M1 TB2P M3 TB2N N3 TA2P N1 TA2N N2 TE1P P2 TE1N P1 TD1P P3 TD1N R3 TCLK1P R1 TCLK1N R2 TC1P T2 TC1N T1 TB1P T3 TB1N U3 TA1P U1 TA1N U2...

Page 23: ......

Page 24: ...ⓒ LG Electronics Inc 2010 PDP TV Repair Guide Applicable Model 50 60PZ550 ...

Page 25: ...o Picture No sound 2 3 Mal discharge Noise dark picture 3 4 Picture broken Freezing 4 5 Vertical bar Horizontal Bar 5 6 B Power Problem No Power Not turn on 6 7 Turn off Instant under watching 7 8 C Sound Problem No sound Sound distortion 8 10 E General function Problem RF emitter checking 10 First of all Check whether there is SVC Bulletin in GCSC System for these model ...

Page 26: ...r Board Control Board Check B 5V Y 1 Check Control Board LED on Crystal X2 3 3V 5V Rom update 2 Replace Control B D A3 A5 A6 SVC R C Pattern Check Sound Sound OK Y Close Y Move No Picture No sound Section A2 Check LVDS Cable Replace Main B D Normal N Y N Move Power problem Section Normal Normal Move Power problem Section N A4 A8 A11 A12 A13 First of all Check whether all of cable between board was...

Page 27: ...ture Sound Ok Section Close Y Check LVDS Cable Picture OK Y N 2 Y Normal Sound N Check Speaker ON Off setting in OSD Menu Close Y Normal Sound N Close Check Speaker jack connection Speaker Cable open Y Normal voltage N Check 17V Audio IC B on Power B D Check Power B D Replace Power B D Check Audio IC Short Replace Main B D SVC Bulletin Apply SVC Bulletin S W Upgrade etc N Normal Sound N Y Close Y ...

Page 28: ...Module N Scan Type Check Picture problem Type Check voltage VY VSC Y Sus B D A5 Normal Picture Replace Y Sus B D Normal Picture Y N 1 Check Control B D 2 Replace Board Normal Picture A13 Check Y Drive B D Replace B D Y Close N Dark Picture Normal Picture Y Replace Module N Close 1 Check Z Sus Board 2 Replace Board A9 Check Picture mode setting Picture Noise Normal Picture Y N Close Y N Check RF Ca...

Page 29: ... Different maker TV etc Menu Setup Booster By using Digital signal level meter By using Diagnostics menu on OSD Menu Press red key on R C Signal TEST Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y N Normal Picture Y Close N N Check S W Version Booster menu On Off Check Off On Check S W Upgrade SVC Bulletin Check Tuner replace Main B D Normal Picture Y N Y Close Norma...

Page 30: ...ule If Main B D doesn t cause N Y Close 1 Connector re connection 2 Eliminate foreign material on Connector N A13 CTRL B D Control board Check connection of Connector COF TCP on CTRL B D X B D Check connection of Connector FFC on Y Drive B D A20 A20 1 Connector re connection 2 Eliminate foreign material on FFC 1 Check Y Drive B D 2 Replace Board A16 Normal Picture N Y Close Replace Module 1 Check ...

Page 31: ...er Key On Remote control Normal Close Y N Y Repair Replace IR B D N Check Power cord was inserted properly N Normal Close Y Check ST BY 5V on Power Board Normal Voltage A22 N Normal Signal Y Check Power B D Replace Power B D Check AC DET Signal on Power B D A22 Check RL_ON Signal on Power B D N Normal Signal Y Check Main B D Replace Main B D Check the other pin s Output voltage on Power B D Normal...

Page 32: ...Power LED Blue Y Check Power B D Replace Power B D A23 1 Check Y Sus Z Sus Board especially Short or Open 2 Replace defective B D A8 A11 To check Power B D Protection Check Power Off History RCU Off 7 Turn off Under watching Off Timer Set A24 Off timer Function off KEY Off 2HOUR Off NO Signal Off Y N Don t appear Power Off History Move No Power problem Section This is not problem Normal operation ...

Page 33: ...grade etc N Normal Sound N Y Close Y 2 Sound distortion sound drop Check Input signal Cable connection Cable open RF external HDMI SCART Normal Sound Y Close Check AVL off on Clear voiceⅡ off on Y Normal Sound N Close N Problem in all input Problem in only DTV Problem in external input SCART HDMI Check whether Problem happen in same output of other equipments or not By connecting same output cable...

Page 34: ... in room Check Replace Battery of R C Check Repair Cable connection Connector solder Normal operating Check B 5V On Main B D A26 Normal Voltage Close N N Check 5V on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A12 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A26 Replace Main B D Y Y N Check local key Operation Normal operating Check Repair Cable...

Page 35: ...s 10 3 RF emitter operating error Y N Check RF emitter Operation Check Repair Cable connection Connector solder A28 Replace RF emitter board Y Display normally Close N Normal operating N Replace Main B D Y A28 Check the signal between the RF emitter and Mani board Normal Signal Check the RF emitter SW Ver at SVC menu Normal operating Close Y N 2010 11 16 ...

Page 36: ...VSC VZB voltage 50R3 VY VSC Y Sus VZB Z Sus A5 6 Fuse Checking Method A7 7 Y Sus Board Checking Method 50R3 A8 8 Z Sus Board Checking Method 50R3 A9 11 Check 5V on Power B D A12 12 Control Board Checking Method 50R3 A13 13 Mal discharge Symptom Picture A14 14 PDP Module Rom Ver Checking method A15 15 Y Drive B D Checking method A16 17 Half picture X B D Checking method 50R3 A18 Next page Continued...

Page 37: ...e A19 19 Connector Type on PDP Module A20 20 RF Signal level Checking method A21 21 Power Problem Check voltage on Power board A22 22 Power board Checking Method A23 23 Check Power off History A24 24 Sound Problem Speaker cable checking method A25 25 Check Remote control IR operation A26 27 Check RF emitter operation A28 PDP TV Repair Process Reference data Index ...

Page 38: ...xel 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 Tilt Key Making 전자 6 2 Revision PDP TV Symptom A Picture Problem Check Module pattern by Tilt key Repair Process Reference data Item A1 A1 2010 11 16 ...

Page 39: ...ptom A Picture Problem Audio check method A2 Jack for Speaker connection 1 Check Audio output by using oscilloscope GND R or R or L or L Audio output waveform 2 Check whether speaker jack was inserted properly or not Repair Process Reference data A2 2010 11 16 ...

Page 40: ...onnector P301 Replace P301 Y N Check SCL SDA R359 R360 Replace R359 R360 N Y Check IC700 Status PDN 23 Reset 31 is High Check Reset R380 PDN R374 They must be High 3 3V Y N Check IC303 Power 17V C340 3 3V R365 R374 Check 17V P600 1 2 3 3V IC606 2 Y N Y Check Mstar I2S Output 27 28 29 30 on IC303 Replace MSTAR IC400 N Replace AMP IC303 Y Repair Process Reference data A2 1 2010 11 16 ...

Page 41: ...e audio trouble shooting Check EDID Download Re download EDID data Digital TV Check video output Follow procedure All source audio trouble shooting Follow procedure digital TV video trouble shooting Y N HDMI Y N Check video output Follow procedure HDMI video trouble shooting Y N Repair Process Reference data A2 2 2010 11 16 ...

Page 42: ...blem Check video output Follow procedure All source audio trouble shooting Y Follow procedure analog TV video trouble shooting N Replace MSTAR IC IC400 Check 3 on TU300 for 5V Check IC605 output Voltage N Y Check SIF signal C301 Replace TU300 N Y Check SIF signal C301 Check SIF line N Y Y Repair Process Reference data A2 3 2010 11 16 ...

Page 43: ...28 R131 R193 R194 JK208 RGB R215 R216 JK207 Side AV R1201 R1202 Replace the Resistor Check IC400 signal JK210 Component C441 C442 JK100 JK101 SCART C435 C436 C437 C438 JK208 RGB C443 C444 JK207 Side AV C439 C440 Replace the Capacitor Follow procedure All source audio trouble shooting Making 전자 6 2 Revision PDP TV Input Block Component AV RGB Audio Problem Y Y Y N N N Repair Process Reference data ...

Page 44: ...nd on the input signal Making 전자 6 2 Revision PDP TV Input Block Optical Audio Problem N Check Signal JK204 3 Check SPDIF signal R296 Replace MSTAR IC400 Check 5V 2 on JK204 Y N Check P601 Output L604 L605 Y A2 5 Repair Process Reference data 2010 11 16 ...

Page 45: ...ent VR901 Va Adjustment VR502 Check Va Check Va Adjust Va Voltage Refer to the Module label for Va specification Check Vs Adjust Vs Voltage Refer to the Module label for Vs specification Repair Process Reference data A3 A3 Control Board Power Board Y Sus Board Z Sus Board PDP Module Label Main Board Check Vs 2010 11 16 ...

Page 46: ...ata PDP Module Label Information A4 A4 Vy Vsc Vzb Model Name Bar Code Code 128 Contains the manugacture No Manugacture No Adjusting Voltage DC Va Vs Adjusting Voltage Set up Vy Vsc Ve Vzb The trade name of LG Electronics Manufactured date Year Month Warning UL Approval Mark UL Approval No Model Name Max Watt Max Volts Max Amps 2010 11 16 ...

Page 47: ...VY VSC VZB voltage 50R3 Repair Process Reference data Voltage Check Adjustment 50R3 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 A5 Module Label A5 Vy adjustment YSUS board Fuses Vsc adjustment Vzb Vy Vsc 2010 11 16 ...

Page 48: ...ptom A Picture Problem Check Adjust VY VSC VZB voltage 50R3 Repair Process Reference data 3 VZB 115V on Z Sus B D Check Point R156 Adjustment Point VR204 Voltage Check Adjustment 50R3 Module Label A5 A5 ZSUS board Vzb Vy Vsc 2010 11 16 ZSUS board Vzb adjustment ...

Page 49: ...ower 5V C304 3 3V C302 1 2V C300 Check Voltage 5V IC605 Output 3 3V IC600 Output 1 2V IC301 Output Y N Check Video color Check Monitor Out Video Scart out Check other input OSD Check IIC Line Check TU_SCL SDA Line N Replace Tuner N Y N Y Check Module N Y Change MSTAR IC400 Y A6 1 Repair Process Reference data A6 2010 11 16 ...

Page 50: ... Making 전자 6 2 Revision PDP TV Input Block Analog TV Video Problem Check RF Cable Check CVBS signal TU601 11 Pin Replace Tuner TU300 Y N Check IC605 Output Voltage L610 Y N Y Replace MSTAR IC400 Check 5V voltage on TU300 Pin3 A6 2 Repair Process Reference data A6 2010 11 16 ...

Page 51: ... Video Problem Check input signal format Is it supported Check signal on R411 C413 C415 Y Check the damage of JK210 And Replace Connector N Y Replace MSTAR IC400 Y Check Component Cable Measured signals depend on the input signal A6 3 Repair Process Reference data A6 2010 11 16 ...

Page 52: ...al format Is it supported Check signal Hsync Vsync R218 R219 Check signal R404 R406 R408 Y Check P205 Replace connector P205 Y N Y Replace R404 R406 R408 N Replace MSTAR IC400 Y Check RGB Cable conductors for damage Y Measured signals depend on the input signal A6 4 Repair Process Reference data A6 2010 11 16 ...

Page 53: ... Check signal line JK207 Video C425 JK100 Video C408 C410 C412 RGB C423 CVBS Replace Capacitor Check AV port of JK207 Side JK100 JK101 Rear Replace connector N Replace MSTAR IC400 Check AV Cable for damage or open conductors Measured signals depend on the input signal Y Y Y Y N A6 5 Repair Process Reference data A6 2010 11 16 ...

Page 54: ...Problem Check input signal format Is it supported Check EDID D L Re Download EDID Check HDMI Cable for damage or open conductors Replace Connector Replace MSTAR IC400 Y Y Y Y N N Check JK200 J201 J202 for proper connection or damage A6 6 Repair Process Reference data A6 2010 11 16 ...

Page 55: ...thod Repair Process Reference data A7 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 Pic 2 Pic 1 DMM mode A7 Pic 1 Fuse check 2010 11 16 ...

Page 56: ... FS203 FS501 Check voltage of diode FET by using digital multi meter Measurement method 0 4V 0 5V Q610 Q612 0 45V 0 55V Q608 Q609 0 45V 0 55V Q601 Q602 0 35V 0 45V Q603 Q605 D604 D605 HS602 0 35V 0 45V Forward O L Overload Reverse D602 HS603 0 35V 0 45V Forward O L Overload Reverse Position Direction Circuit No HS601 D610 Q606 Q607 Forward 0 35V 0 45V 0 45V 0 55V Reverse O L Overload Specification...

Page 57: ... at P203 connector Check all of fuses open FS202 Check voltage of diode FET by using digital multi meter Measuring Method Specifications 0 45V 0 55V Q102 Q103 0 5V 0 6V 0 35V 0 45V Q106 Q109 Position Direction Circuit No HS101 D114 D118 Q107 Q110 Forward 0 35V 0 45V 0 35V 0 45V Reverse O L Overload HS102 D109 D110 D108 D111 Q104 Q113 Q114 Forward 0 35V 0 45V Reverse O L Overload Diode FET ZSUS boa...

Page 58: ...ics Inc 2009 Making 전자 6 2 Revision PDP TV Symptom A Picture Problem Check 5V 17V on Power B D Repair Process Reference data A12 Measure 5V voltage Power Board P813 P600 P813 Measure 17V voltage A12 17 02 2010 11 16 ...

Page 59: ...P105 18V of P2 at control board Check LED is on If LED doesn t work check crystal X1 output Check 3 3V 5V IC Check MCM at VS_DA by using digital multi meter Check Crystal X1 Check Input voltage Check IC IC53 IC51 Check oscillation of Crystal Normal 25 MHZ MCM Check point VS_DA GND Normal 3 3V Check MCM 3 3V Pin 14 15 18V IC51 IC53 P2 18V Pin14 15 5V 3 3V GND P105_FL1 FL2 5V Check LED On 2010 11 16...

Page 60: ... Making 전자 6 2 Revision PDP TV Symptom A Picture Problem Mal discharge Symptom Repair Process Reference data Dark picture caused by Mal discharge A14 Dot type Mal discharge symptom Scan type Mal discharge symptom A14 2010 11 16 ...

Page 61: ... Ver Checking method Repair Process Reference data A15 Check by using Rom Label on control board Rom ver Label Check by using SVC Remote controller Press In start Press 0413 Select Panel Control Check Module Rom ver Refer to the Module Rom upgrade manual for Rom upgrade USB Type Jig A15 2010 11 16 ...

Page 62: ...vision A16 PDP TV Symptom A Picture Problem Y Drive B D Checking method 50R1 Repair Process Reference data A16 Y drive board Check all output pins of scan IC connector using DMM Input signal connector Scan IC DMM Digital Multi Meter 2010 11 16 ...

Page 63: ...220 P221 P320 Power connector of the X board Check cables between CTRL board and X board Replace the X B D Check TCP connection after X B D replacement Connections between panel and X B D Right display Picture 1 Check replace right X B D Both ends display Picture 2 Check replace center X B D Left display Picture 3 Check replace left X B D Picture 1 Picture 2 Picture 3 Half display abnormal Partly ...

Page 64: ...B D 3 Replace CTRL B D Vertical lines or Bar 1 Check connection CTRL B D X B D 2 Check CTRL B D 3 Replace CTRL B D Many irregular vertical lines 1 Check connection CTRL B D X B D 2 Check CTRL B D 3 Replace CTRL B D Horizontal Line or Bar 1 Check connection Y Sus B D Panel 2 Check Y Sus B D 3 Replace Y Sus B D First of all Check whether all of cable between board was inserted properly or not Next C...

Page 65: ... data A20 96 Out Put COF Type 1 Check foreign Connection status 2 Check bad soldering on Chip resistance Defect symptom 192 Out Put TCP Type TCP Tape Carrier Package is film for IC connect with Electrode pattern Direct Bonding on X B D FFC Type Connector to connect between Electrode PAD Of PANEL and Y Drive B D Z Sus B D A20 2010 11 16 ...

Page 66: ...nal level Checking method Repair Process Reference data MENU Æ Press Red Button on R C Æ 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 A21 A21 2010 11 16 ...

Page 67: ...r Process Reference data Check voltage on Power board A22 B Power Problem Checking Order Checking Order Pin Map Power B D Main B D No Checking Point Spec Remark 1 STBY 5V 2 5V 5V 3 17V 17V 4 AC DET High 3 3V 5V 5 RL_ON High 3 3V 5V 6 M_ON High 3 3V 5V A22 P813 2010 11 16 ...

Page 68: ...esistor Check FUSE Check 5V Va Vs voltage 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 Checking Method Va Voltage ADJ value value Adjust way Check 5V Va Vs voltage For Voltage specification refer to the PDP Module Label SC101 Vs Voltage ADJ Adjust Va Vs voltage Vs adjust Va adjust A23 P811 Power B D Y Sus B D P81...

Page 69: ... Remote controller Press In start Press 0000 Select Power Off History Pop up Module Rom ver LAST HISTORY 1 5 Appear Power off history 5ea 1 is the latest history RCU OFF Power off by Remote control KEY OFF Mechanical power switch off 2HOUR OFF After turn on by OnTimer There is no operation for 2hours NO SIGNAL OFF In case that there is no signal for 15minutes A24 2010 11 16 ...

Page 70: ...er 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 A25 Making 전자 6 2 Revision PDP TV Symptom Repair Process Reference data Speaker cable checking method C Sound Problem A25 2010 11 16 ...

Page 71: ...2 Check 3 3V_ST Voltage at Pin10 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 Checking method Check Remote control IR operation IR Local key Board for 2 3 4 550 TOOL IR Board A26 A26 TOUCH_VER_CHK NC NC IR GND KEY1 KEY2 LED RED GND SCL SDA GND 3 3V ST NC NC 2010 11 16 ...

Page 72: ...ltage on multi meter when operate Local switch Test Condition for case 3 Check Point Pin 2 3 Key1 Key2 TV power on status Multi meter Select DC 10V A27 P P Vol Vol OK Menu Input Power D General function defect Check Local Key operation Symptom A27 TOUCH_VER_CHK NC NC IR GND KEY1 KEY2 LED RED GND SCL SDA GND 3 3V ST NC NC IR Local key Board for 2 3 4 550 TOOL 2010 11 16 ...

Page 73: ...ear 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 A28 D General function defect Check RF emitter operation Symptom A28 3D_L R_SYNC 3D_RF_GPIO2 3 3V GND 3D_RF_RXD 3D_RF_TXD 3D_RFMODULE_RESET 3D_RFMODULE_DC 3D_RFMODULE_DD GND 3D_RF_GPIO0 3D_RF_GPIO1 RF emitter Board 2010 11 16 ...

Search results

Summary of Contents for 42PT450

Reviews:

Related manuals for 42PT450

Brands by name

Popular brands

LG 42PT450, Service Manual

Search results

Summary of Contents for 42PT450

Reviews:

Related manuals for 42PT450

Brands by name

Popular brands