LG 42PQ301R Service Manual Download Page 2

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LGE Internal Use Only

CONTENTS

CONTENTS ............................................................................................................................... 2

SAFETY PRECAUTIONS ...........................................................................................................3

SPECIFICATION.........................................................................................................................4

ADJUSTMENT INSTRUCTION ..................................................................................................8

BLOCK DIAGRAM ...................................................................................................................16

EXPLODED VIEW .................................................................................................................. 17

SVC. SHEET ................................................................................................................................

Summary of Contents for 42PQ301R

Page 1: ... READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS PP91B MODEL 42PQ301R 42PQ301R ZB North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only P NO MFL60273009 0906 REV00 Printed in Korea ...

Page 2: ...Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 8 BLOCK DIAGRAM 16 EXPLODED VIEW 17 SVC SHEET ...

Page 3: ... 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 meta...

Page 4: ...elative Humidity 65 10 3 Power Voltage Standard Input voltage 100 240V 50 60Hz Standard Voltage of each product is marked by models 4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM 5 The receiver must be operated for about 20 minutes prior to the adjustment V Test Method 1 Performance LGE TV test method followed 2 Dema...

Page 5: ... LGE SPEC Maker LGIT Display Screen Device Aspect Ratio PDP Module Operating Environment Storage Environment Input Voltage 1 2 3 4 5 6 No Item Specification Remark 50 inch 16 9 Color plasma Display Module 16 9 PDP50H3 RGB Closed Type 1 Temp 0 55deg 2 Humidity 20 80 3 Temp 10 60deg 4 Humidity 10 90 AC100 240V 50 60Hz PDP Glass Filter LGE SPEC Maker LGIT Display Screen Device Aspect Ratio PDP Module...

Page 8: ... minutes prior to the adjustment when module is in the circumstance of over 15 In case of keeping module is in the circumstance of 0 C it should be placed in the circumstance of above 15 C for 2 hours In case of keeping module is in the circumstance of below 20 C it should be placed in the circumstance of above 15 C for 3 hours 3 S W Program Download 3 1 Profile This is for downloading the s w to ...

Page 9: ...ontrol R C power on TV USB file EPK version must be bigger than downloaded version of main B D 1 Using Power ON button of the control R C Power on TV 2 Insert the USB memory stick to the SET 3 Display USB loding message then push the Exit Key of control R C 4 Push the MENU Key and move the cusor OPTION of OSD Fig 1 Caution Don t push the OK key Just cusor is on the OPTION menu 5 Push the 7 key of ...

Page 10: ...HDMI 3 will be disappeared at OSD Window Caution When you adjust tool option don t connect HDMI or D sub cable If you connect some cable EDID D L process will be failed 6 Adjustment method Before PCBA check have to change the Tool option and Area option About PDP After done all adjustments Press IN START button and compare Tool option and Area option value with its BOM if it is correctly same then...

Page 11: ...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 5 3 Connection Structure Caution Never connect HDMI D SUB Cable at the same time 5 4 EDID Data O WXGA EDID DATA 50inch Analog RGB 128bytes HDMI 1 256bytes HDMI 2 256bytes HDMI 3 256bytes SIDE HDMI HDMI 3 is adjusted above 60Tool model O XGA EDID DA...

Page 12: ...t 0 ADC calibration by using D E CH and press ENTER V 5 Start ADC adjustment by using F G VOL or press ENTER V 6 ADC adjustment is executed automatically When ADC adjustment is finished this OSD appear 7 2 RGB input ADC Auto RGB Gain Offset Adjustment 1 Convert to PC in Input source 2 Press ADJ key on R C for adjustment 3 Enter Password number The value of Password is 0 0 0 0 4 Select 0 ADC calibr...

Page 13: ...djustment under the 10LUX Notice When using the Color Analyzer with PDP recommend the CA 100 more than CA 210 If CA 100 can not available it is also good to use the CA 210 4 PC for communication through RGB 5 Pattern Generator MSPG 925FA etc Before white balance press the ADJ key and select third row like Fig 5 To enter White balance mode Enter Password Number 0 0 0 0 and select third row Caution ...

Page 14: ...n 2 Decrease the one of the others In case of decreasing the x decreasing the R fix G In case of decreasing the y decreasing the G fix R 3 x target y target 1 First decrease B so make y a little more than the target 2 Adjust x value by decreasing the R 4 x target y target 1 First decrease B so make x a little more than the target 2 Adjust x value by decreasing the G 7 When adjustment is completed ...

Page 15: ...5 LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes 0 003 6 500K Warm 0 000 9 300K Medium 0 000 11 000K Cool 0 276 0 002 0 285 0 002 0 293 0 002 0 329 0 002 0 313 0 002 0 283 0 002 Y X uv Temp Color coordinate Mode O DDC Adjustment Command Set R G B GAIN max value C0 Adjustment Adjustment Adjustment ...

Page 17: ... 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 Do not modify the original design without permission of manufacturer IMPORTANT SAFETY N...

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Page 28: ...ture 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 9 E General function Problem Remote control Local switch checking 9 First of all Check whether there is SVC Bulletin in GCSC System for these model Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal U...

Page 29: ...Crystal X101 1 8V 3V 5V FET 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 VY VSC VZB A8 A11 A12 A13 First of all Check whether all of cable between board was inserted properly or not Main B D Power B D...

Page 30: ...n by using TILT key on SVC R C Normal A1 N Check Sound Sound OK Y A2 N Move No Picture Sound Ok Section Close Y Check LVDS Cable Replace Main B D Normal Y N Replace Main B D Normal Check Input signal RF Cable connection SCART Cable connection HDMI Cable connection Component Cable 2 Normal Y N Repair Replace IR B D Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service...

Page 31: ... 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 42G2 A11 50G2 Check Picture mode setting Picture Noise Normal Picture Y N Close Y N Check RF Cable Connection Check Tuner Replace Normal Picture Check Discharge resistance 10Ω 2 3ea on Powe...

Page 32: ...maker TV etc SVC Bulletin Replace Main B D Check Tuner soldering Normal Picture Y N Y Close Normal Picture Y Close Menu Setup Booster By using Digital signal level meter By using Diagnostics menu on OSD Menu Setup Diagnostic Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N N Normal Picture Y Close N 09 years...

Page 33: ... 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 FPC 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 CTRL B D 2 Replace Board Normal Picture N Y Close N Y Normal Hori...

Page 34: ...y mechanical power switch to reduce power consumption in stand by status If mechanical power switch off Doesn t turn on by remote control Doesn t appear LED light N Normal Close Y A27 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 ...

Page 35: ...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 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for t...

Page 36: ...ck 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 Case 1 Problem in external input Case 2 SCART HDMI Check whether Problem happen in same output of other equipments or not By connecting same output cable of other equipment DVD Player Set Top Box different mak...

Page 37: ...le 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 R C Operation Normal operating Y Check Repair Cable connection Connector solder Normal operating Close N Chec...

Page 38: ...ethod 42G2 A9 9 Y Sus Board Checking Method 50G2 A10 10 Z Sus Board Checking Method 50G2 A11 11 Check 5V 12V on Power B D A12 12 Control Board Checking Method 42G2 50G2 A13 13 Mal discharge Symptom Picture A14 14 PDP Module Rom Ver Checking method A15 15 Y Drive B D Checking method A16 16 Check Discharge resistor on Power B D A17 17 Half picture X B D Checking method 42 50G2 A18 Next page Continue...

Page 39: ...board A22 22 Power board Checking Method A23 23 Check Power off History A24 24 Speaker cable checking method A25 25 General Function Problem Check Remote control IR operation A26 26 Check Local switch operating A27 27 Check Local switch assembly status A28 PDP TV Repair Process Reference data Index Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE In...

Page 40: ...ine 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 Revision 2009 2 1 PDP TV Symptom A Picture Problem Check Module pattern by Tilt key Repair Process Reference data Item A1 A1 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 41: ...nnection 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 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 42: ...t VR901 Va Adjustment VR502 Va Vs on Y Sus B D Va Vs on Power B D Check Va Vs 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 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 43: ...m A Picture Problem PDP Module Label Information Repair Process Reference data PDP Module Label Information Vy Vsc Vzb A4 A4 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ...justment 42G2 Y Sus Board Fuse VSC Adjustment VY Adjustment 1 Vy 175V on Y Sus B D Check Point R201 Adjustment Point VR502 2 Vsc 140V on Y Sus B D Check Point R520 J263 Adjustment Point VR501 VY VSC VZB A5 Module Label A5 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ...oltage Repair Process Reference data 3 VZB 80V on Z Sus B D Check Point R50 J221 Z Sus Board Adjustment Point A5 Voltage Check Adjustment 42G2 VY VSC VZB Module Label A5 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 46: ...Voltage Check Adjustment 50G2 Y Sus Board Fuse Vsc Adjustment VY Adjustment 1 Vy 185V on Y Sus B D Check Point R201 Adjustment Point VR502 2 Vsc 135V on Y Sus B D Check Point R202 Adjustment Point VR501 VY VSC VZB A6 Module Label A6 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...tage Repair Process Reference data 3 VZB 80V on Z Sus B D Check Point R271 J125 Adjustment Point VR200 Z Sus Board Adjustment Point A6 Voltage Check Adjustment 50G2 VY VSC VZB Module Label Fuse A6 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ... 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 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...r HS2 PASS ER UP Down FET Diode HS1 SUS UP Down FET Diode Q11 Q16 FET 6ea D11 D12 Diode 2ea Q21 Q23 FET 3ea D21 D24 Diode 4ea Measuring Method HS1 HS2 Fuse A8 D21 D24 Q21 Q23 HS2 0 3 0 4V 0 4 0 5V Forward HS1 OL Overload Reverse Position OL Overload Reverse 0 3 0 4V 0 4 0 5V 0 3 0 4V 0 3 0 4V Forward Q16 Q15 D11 12 Q11 Q14 Circuit No Direction Specification Fuse Diode FET A8 Copyright ⓒ 2009 LG El...

Page 50: ...ge of Diode FET by using Digital Multi Meter HS1 HS2 Diode FET Q506 Q505 D506 Q504 Q503 D505 D501 D502 Q501 Q502 D503 D504 HS1 HS1 HS2 HS2 Check Method Measuring Method HS2 HS1 0 3 0 4V 0 3 0 4V Forward OL Overload Reverse Position OL Overload Reverse 0 3 0 4V 0 4 0 5V Forward Diode FET Classify Direction Specification P2 P3 A9 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for traini...

Page 51: ...load Reverse 0 3 0 4V 0 3 0 4V Forward D21 Q22 23 HS2 Q16 Q18 D11 Q11 Q13 HS3 0 4 0 5V 0 3 0 4V 0 3 0 4V Forward HS1 OL Overload Reverse Position OL Overload Reverse 0 4 0 5V 0 3 0 4V 0 4 0 5V Forward D32 D36 Q34 Q31 32 Circuit No Direction Specification HS1 HS2 HS3 Q31 Q32 Q34 FET 3ea D32 D36 Diode 4ea Q11 Q13 Q16 Q18 FET 6ea D11 Diode 1ea HS1 HS2 HS3 Q22 Q23 FET 2ea D21 Diode 1ea FET Diode Fuse ...

Page 52: ... Meter HS200 HS2 Diode FET Check Method Measuring Method D311 312 Q313 Q318 Q311 312 0 5V 0 6V HS201 HS200 0 3V 0 4V 0 3V 0 4V Forward OL Overload Reverse Position OL Overload Reverse 0 3V 0 4V 0 4V 0 5V Forward Diode FET Classify Direction Specification P100 D301 D302 Q301 Q303 D305 Q318 Q315 Q313 Q312 HS200 HS200 HS201 HS201 D311 D312 HS201 Fuse P101 D303 Q304 D306 Q317 Q314 Q311 A11 Copyright ⓒ...

Page 53: ... Check 5V 12V on Power B D Repair Process Reference data A12 Measure 5V voltage Power Board Pin Map Power B D Main B D P813 P1100 P813 P1100 P813 Measure 12V voltage A12 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ...t doesn t appear check Crystal X101 output Check 3 3V 5V 1 8V FET Check MCM at VS_DA by using Multi meter Checking Method Check Crystal X101 3 3 V 5 V 1 8 V Check LED On Check Input voltage GND Check Crystal X101 Check oscillation of Crystal Normal 100 MHZ 1 6v MCM Check point VS_DA GND Normal 3 3V Check MCM A13 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service p...

Page 55: ...harge Symptom Repair Process Reference data Dark picture caused by Mal discharge A14 Dot type Mal discharge symptom Scan type Mal discharge symptom A14 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ... by using Rom Label on control board Rom ver Label Check by using SVC Remocon Press In start Press 0000 Select Panel option Pop up Module Rom ver Refer to the Module Rom upgrade manual for Rom upgrade USB Type Jig A15 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ... value as the below there is no problem ÎNormal Forward 0 7V 0 8V Reverse O L If Y Drive have defect short DMM display almost 0v DMM Digital Multi Meter In case that Y Drive is ok Diode Forward 0 7V Reverse O L Y Drive board Input connecter Scan IC Red Probe Black Probe Output connecter Check all pin on output connector by using Black probe 42G2 50G2 Input connecter Copyright ⓒ 2009 LG Electronics...

Page 58: ...D Repair Process Reference data A17 Check Discharge resistor 10Ω 22Ω 2 3ea on Power B D before replace Y Drive B D 42 Maker LGIT Sanken 42 Maker Lite On 50 HD Maker LGIT Sanken A17 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ... To replace the X B D 4 Be sure the connection of TCP after X B D replacing Relation between screen and X B D Left No Picture Picture1 Check Replace Right X B D Right No picture Picture2 Check Replace Left X B D Partly no Picture abnormal Half No picture Picture2 Picture1 abnormal Y Sus B D Control B D X B D Check Connector TCP FFC connection on Board XL Left X B D XR Right X B D A18 Copyright ⓒ 2...

Page 60: ...re the connection of TCP after X B D replacing Relation between screen and X B D Left No Picture Picture1 Check Replace Right X B D Right No picture Picture2 Check Replace Left X B D Partly no Picture abnormal Half No picture Picture2 Picture1 abnormal Y Sus B D Control B D X B D Check Connector TCP FFC connection on Board XL Left X B D XR Right X B D XC Center X B D Connector XC XR Connector XL X...

Page 61: ...al Line or Bar 1 Check connection CTRL B D X B D 2 Check CTRL 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 Regular vertical lines To action defects description Symptom picture First of all Check whether all of cable between board was inserted properly or not Next Check whether there is foreign material on connector A19 Copyright...

Page 62: ... 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 FPC Type Connector to connect between Electrode PAD Of PANEL and Y Drive B D Z Sus B D A20 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ...e data MENU Æ SETUP Æ 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 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ...ap Power B D Main B D P813 P1100 7 6 5 4 3 2 1 No Mechanical switch on Low GND Value KEY ON High 3 3V 5V RL_ON High 3 3V 5V AC DET 5V STBY 5V Check the other pin s output High 3 3V 5V Vs ON High 3 3V 5V M5V_ON Remark Spec Checking Point A22 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 65: ...en 3 Lite On 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 M5V 9 NC 3 VS 2 VS 1 Va 6 GND 5 GND 4 M5V 10 GND 8 Va 7 P811 Pin Power B D Y Sus B D Check 5V Va Vs voltage For Voltage specification refer to the PDP Module Label Fuse Vs Voltage ADJ Adjust Va Vs voltage Vs adjust Va adjust A23 Copyrigh...

Page 66: ...Pop up Module Rom ver Appear Power off history 5ea 1 is the latest history LAST HISTORY 1 5 In case that there is no signal for 15minutes NO SIGNAL OFF After turn on by OnTimer There is no operation for 2hours 2HOUR OFF Mechanical power switch off KEY OFF Power off by Remote control RCU OFF A24 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Intern...

Page 67: ...e or not 2 Check whether speaker cable have problem disconnection wire or not A25 Making Revision 2009 2 1 PDP TV Symptom Repair Process Reference data Speaker cable checking method C Sound Problem A25 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 68: ... 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 Board for XXPQ60xx SCL Sub AMP GND KEY ON KEY2 KEY1 GND SDA Sub AMP GND 5V ST 5V Multi 3 3V CI LED Red LED Green GND IR IR Board for XXPQ20 30xx IR Board A26 A26 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for train...

Page 69: ...Pin 2 3 Key1 Key2 TV power on status Multi meter Select DC 10V 4 Check bad solder assembly status on Tactical power switch Checking method Check Local switch operating SCL Sub AMP GND KEY ON KEY2 KEY1 GND SDA Sub AMP GND 5V ST 5V Multi 3 3V CI LED Red LED Green GND IR Local switch Board A27 Local switch Board for XXPQ60xx Local switch Board for XXPQ20 30xx Enter Menu Input Mechanical Power Vol Vol...

Page 70: ...s Reference data Check Local switch assembly status A28 D General function defect Check Local KEY assembly status XXPQ20 30xx XXPQ60xx A28 Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

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