LG 42PC3RA Series Service Manual Download Page 2

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CONTENTS

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

DESCRIPTION OF CONTROLS ..........................................................................4

SPECIFICATIONS ..............................................................................................10

ADJUSTMENT INSTRUCTIONS .......................................................................12

TROUBLE SHOOTING GUIDE ..........................................................................22

PRINTED CIRCUIT DIAGRAM ..........................................................................31

BLOCK DIAGRAM .............................................................................................35

EXPLODED VIEW ..............................................................................................36

EXPLODED VIEW PARTS LIST ........................................................................37

REPLACEMENT PARTS LIST...........................................................................38

SCHEMATIC DIAGRAM.........................................................................................

Summary of Contents for 42PC3RA Series

Page 1: ...V SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS PP61A MODEL 42PC3RA 42PC3RA ZJ website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ... 3 DESCRIPTION OF CONTROLS 4 SPECIFICATIONS 10 ADJUSTMENT INSTRUCTIONS 12 TROUBLE SHOOTING GUIDE 22 PRINTED CIRCUIT DIAGRAM 31 BLOCK DIAGRAM 35 EXPLODED VIEW 36 EXPLODED VIEW PARTS LIST 37 REPLACEMENT PARTS LIST 38 SCHEMATIC DIAGRAM ...

Page 3: ...k 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 metallic part has a return path to the chassis the measu...

Page 4: ...y changing mode source These buttons are used for teletext only TELETEXT models or Programme edit Switches the sub picture PIP DW POP or off mode Adjusts the sub picture size Moves the sub picture Selects a programme for the sub picture Selects the input source for the sub picture in PIP Twin picture mode Controls some video cassette recorders or DVD players when you have already selected DVD or V...

Page 5: ...e e e e e e e e e e e e e e e e e e e e g g g g g g e e h h h h h h e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e g g g g g g e e h h h h ...

Page 6: ...R VOL OK MENU INPUT Remote Control Sensor Power Standby Indicator illuminates red in standby mode illuminates orange when the set is switched on PROGRAMME Buttons VOLUME Buttons OK Button MENU Button INPUT Button ON OFF Button ...

Page 7: ...fications page Never attempt to operate the TV on DC power S Video Input Connect S Video out from an S VIDEO device Audio Video Input Connect audio video output from an external device to these jacks RS 232C INPUT CONTROL SERVICE PORT Connect S Video out from an S VIDEO device Variable Audio Output Connect an external amplifier or add a sub woofer to your surround sound system Antenna Input Connec...

Page 8: ... PU T DVD ARC EXIT VO L TIM E RE VE AL INDE X Q V IEW MU TE PR SL EE P LI ST I I I M ENU TEXT PIP SIZ E POSTION VCR PO W ER 1 2 3 4 5 6 7 8 9 10 FAV Remote Control Power Cord 2 Wall brackets 2 eye bolts 2 bolt for stand assemlby This feature is not available for all models For 42PC1RV 42PC3RV 42PC3RA ...

Page 9: ...outward O Place the set with the screen facing down on a cushion or soft cloth as shown in Figures 1 Before unfolding the stand please make sure two locks A on the bottom of the stand push outward O Pull the stand out as shown above in Figures 2 3 After unfolding the stand please insert and tighten the screws in the holes B on the bottom of the stand O When connecting cables to the set Do not dise...

Page 10: ...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 Demanded other specification Safety CE IEC specification EMC CE IEC V General Specification 1 Module Specification 42 XGA MODULE Chassis PP61A 42PC3RA ZJ EU LG Model Name Market Brand Remark 42PC3RA ZJ Safety IEC EN60065 EMI EN55013 EMS EN55020 EU Model A...

Page 11: ... 4EA Wired Control 1EA Audio variable out 1EA 1 2 3 4 5 6 7 8 9 10 11 12 13 No Item Specification Remark EU PAL BG I DK NTSC BAND PAL NTSC VHF UHF C1 C69 2 83 CATV S1 S47 1 71 Upper Heterodyne PAL SECAM NTSC PAL SECAM NTSC PAL SECAM NTSC Y Cb Cr Y Pb Pr RGB PC RGB DTV HDMI DTV PC Audio Component 1EA AV 2EA 4 System PAL SECAM NTSC PAL60 4 System PAL SECAM NTSC PAL60 4 System PAL SECAM NTSC PAL60 L ...

Page 12: ...rior to the adjustment O After RGB Full White in HEAT RUN Mode the receiver must be operated prior to the adjustment O Enter into HEAT RUN MODE 1 Press the POWER ON KEY on R C for adjustment 2 OSD display and screen display 100 full WHITE PATTERN Set is activated HEAT run without signal generator in this mode Single color pattern RED BLUE GREEN of HEAT RUN MODE uses to check panel Caution If you t...

Page 13: ...Download vi2c program in PC then a main window will be opened 3 Double click the blue box and confirm Bootloader Version as 40 4 Click the Erase Flash button G Select the bootloader bat file install VCTP_download bootloader G Push OK G Finish the program after saving the file download_cs vi2c if you click the massage appears automatically 13 ...

Page 14: ...and execute downloading with click open button 8 Click OK button at the edit window 9 Under Downloading process 10 If download is failed for example No acknowledge from slave Execute download again from 1 4 2 Download Method 2 AV Plate Ass y 1 Push S W ON connect SCL to GND using switch at Jig and connect the download jig to D sub jack 2 Supply the power Stand by 5V and wait for 3 seconds ...

Page 15: ... the blue box and confirm Bootloader Version as 40 6 Click the Erase Flash button 7 Double click the download file low then edit window will be opened 8 Chick the choice button I n the edit window then file choice window will be opened 9 Choose the Hex file in folder and execute downloading with click open button 10 Click OK button at the edit window ...

Page 16: ...Remocon Then the PDP will change a slave mode 2 Connect Zig to TV using a D sub cable 3 Execute Download_CS vi2c program in PC then a main widow will be opened 4 Click GO button If you don t push the go the Hex file would not be downloaded although the download proceeds normally at first glance 5 Double click the blue box and confirm Bootloader Version as 40 6 Click the Erase Flash button ...

Page 17: ... with click open button 10 Click OK button at the edit window 11 Under Downloading progress 12 If download is failed for example No acknowledge from slave execute download again from 1 5 Channel Memory Download 1 Connect the download jig to D sub jack 2 Execute Channal vi2c program in PC then a main widow will be opened 3 Push the button change and select the Channel memory data 4 Push the Update ...

Page 18: ...or Measuring Refer to Fig 1 8 3 Adjustment Method Adjustment Method for Power Board P No 6709900019A 1 Va Adjustment 1 After receiving 100 Full White Pattern HEAT RUN 2 Connect terminal of D M M to Va pin of P812 connect terminal to GND pin of P812 3 After turning VR0901 voltage of D M M adjustment as same as Va voltage which on label of panel right top Deviation 0 5V 2 Vs Adjustment 1 Connect ter...

Page 19: ... connect HDMI D SUB Cable at the same time Use the proper cables below for EDID Writing For RGB EDID For HDMI EDID 42PC1RVA 42PC1RV 42PC3RA 42PC3RV 42PC1R Analog Digital Analog Digital Analog Digital Analog Digital Analog Digital 40043 40044 40045 40046 40047 40048 40021 40022 40049 40050 9C6B 9C6C 9C6D 9C6E 9C6F 9C70 9C55 9C56 9C71 9C72 6B9C 6C9C 6D9C 6E9C 6F9C 709C 559C 569C 719C 729C Model A D ...

Page 20: ... Jig PC Cable 2 Turn on the PC EDID Download Jig And Execute the S W EDID TESTER Ver 2 5 3 Set up the S W option Repeat Number 5 Device Address A0 PageByte 8 4 Power on the Set 9 4 Sequence of Adjustment DDC data of Analog RGB 1 Init the data 2 Load the EDID data Open File 3 Set the S W as below 4 Push the Write Data Verify button And confirm Yes 5 If the writing is finished you will see the OK me...

Page 21: ...ht with R Gain B Gain using F G VOL key on R C 8 Adjust it until color coordination becomes as below Brightness High Light 80 20cd m2 Color Coordinate High Light X 0 283 0 003 Y 0 298 0 003 Color Temperature 9 300 K 500 K 9 When adjustment is completed Exit adjustment mode using EXIT key on R C 11 Input the Shipping Option Data 1 Push the IN START key in a Adjust Remocon 2 Input the Option Number ...

Page 22: ...Doesn t the high tension output come out Doesn t the VSC signal Vs ON come out Yes Yes Does high tension output voltage Drop occur When the Y B D Module input connector is removed does output voltage drop occur When the Y Z B D Module input connector is remove does Power Board hightension output voltage Drop occur Yes No No 9 Check the Power Board Output high tension circuit Yes 10 Check the Z B D...

Page 23: ... 23 1 2 42 Power Board Structure T801 Vs Trans T901 Va Trans T112 Low Voltage Trans T501 ST BY Trans T601 PFC Inductor ...

Page 24: ...e Filter Cable to PSU connected Connect the Cable Yes No Is the Fuse F101 on PSU normal Exchange the Fuse Yes No Is the PSU and Main Board with 13P Cable connected Connect a 13p Cable Yes No After the cable connect is removed to Power Board except the EL11 connection cable the AC voltage marking is authorized on manual When ST BY 5V is not operated replace PSU ...

Page 25: ...d with 10p and 4pin cable Pull off the power cord and wait until discharge entirely you can watch the LED on a main board through a Back cover If LED is off a discharge is finished Then plug in the power cord again Has it still a problem Is normal the Main board Check voltages of P900 in main board Yes No Is normal the IR board and Local key Exchange the IR and Local key Exchange the Main board Co...

Page 26: ... at Y board are Va Vs normal Are Fuses FS2 FS3 normal Exchange the fuse at abnormal Yes No Yes Yes Exchange Z board Is normal Z board Disconnecting cable P1 P2 P6 at Z board are Va Vs normal Are Fuses FS1 FS2 Normal Exchange the fuse at abnormal Disconnecting cable P1 3 4 105 at X board are Va Vs normal Yes No Yes Is normal X board Disconnecting P1 P3 Va Vs is normal Exchange Right X B D Disconnec...

Page 27: ... normal Exchange the fuse at abnormal Yes No Yes Yes Exchange Z board Is normal Z board Disconnecting cable P1 P2 P6 at Z board are Va Vs normal Are Fuses FS1 FS2 Normal Exchange the fuse at abnormal Disconnecting cable P1 3 4 105 at X board are Va Vs normal Yes No Yes Is normal X board Disconnecting P1 P3 Va Vs is normal Exchange Right X B D Disconnecting P4 P105 Va Vs is normal Exchange Left X B...

Page 28: ... at Scart1 2 or Component2 RGB or Side AV Good Are good some elements C R L or Diode at Sound path Is IC800 good Switching IC Is IC601 good VCT P 1 Speaker part 2 Main board part No No No No Yes Yes Yes Is sound at HDMI Good Is EDID download good Is IC401 good AD9381 No Yes If it dead or short exchange this elements Exchange IC800 No No Exchange IC601 No Is IC801 good Amplifier Exchange IC801 No I...

Page 29: ...ner cable connected well Are input voltage I2C and CVBS output good Insert the cable exactly Exchange the Tuner Yes No No No Is Gaskets added well Is added the ferrite core at cable Add the ferrite core Add the Gasket Re assemble the SET No No No Yes No Is arranged the cable well Re arrange the cable Don t cross the cable above a X or Z board No 2 Noise appears at Side AV ...

Page 30: ... display No No Are input voltage I2C and CVBS output good in Tuner Exchange the Tuner No Is VCT P IC good Exchange the VCT P IC No No Is the LVDS cable connected Are good some elements C R L or Diode at path Check the EDID data Yes Yes Insert the LVDS cable exactly If it dead or short exchange this elements Download the EDID data Yes No No Is AD9381 good only _ HDMI Exchange AD9381 IC No Is VCT P ...

Page 31: ... 31 PRINTED CIRCUIT BOARD MAIN TOP CONTROL ...

Page 32: ... 32 MAIN BOTTOM PRE AMP ...

Page 33: ... 33 POWER TOP ...

Page 34: ... 34 POWER BOTTOM ...

Page 35: ... 35 BLOCK DIAGRAM ...

Page 36: ... 36 EXPLODED VIEW 203 204 206 200 205 201 202 400 240 250 430 301 304 303 302 501 520 502 570 120 121 560 300 580 ...

Page 37: ...pporter ASSY AL FILTER BOTT 42PC1 LGEMA 303 4980900115A Supporter COMPLEX ASSY AL FILTER RIGHT 42PC1R TA 4980900369A Supporter ASSY AL ASSY AL FILTER RIGHT 42PC1 LGEMA 304 4980900116A Supporter COMPLEX ASSY AL FILTER LEFT 42PC1 TA 4980900370A Supporter ASSY AL ASSY AL FILTER LEFT 42PC1 LGEMA 400 3809900103C Cover Assembly 42PC3R NON ANALOG MCK30275903 Cover PRESS PCM 0 4 42PC3R ZH AL 430 350190001...

Page 38: ... 0TR387500AA 0TR387500AA 0TR387500AA 0TR387500AA 0TR387500AA 0TR387500AA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA 2SC3875S ALY NPN 5V 60V 50V 150MA KTC3198 KTC1815 NPN 5V 60V 50V 150MA KRC103M NPN 40V 50...

Page 39: ...NSEC LOCA NO PART NO DESCRIPTION D116 D121 D121 D122 D123 D124 D124 D125 D126 D127 D252 D262 D300 D302 D303 D604 D606 D703 D704 D804 D854 D900 D902 D903 ZD301 ZD303 ZD304 ZD305 ZD308 ZD312 ZD1000 ZD121 ZD151 ZD252 ZD501 ZD502 ZD503 ZD601 ZD802 ZD852 C1000 C1001 C1002 C1003 C1004 C1006 C1007 C1009 C101 C1011 0DS226009AA 0DS113379BA 0DS226009AA 0DS113379BA 0DS113379BA 0DS113379BA 0DS226009AA 0DS2260...

Page 40: ...3K500CT 10nF 10 50V MVK6 3TP16VC100M 100uF 20 16V LOCA NO PART NO DESCRIPTION C111 C112 C113 C114 C115 C116 C117 C118 C119 C120 C121 C122 C123 C124 C124 C125 C125 C126 C126 C127 C128 C131 C134 C135 C137 C138 C141 C142 C151 C152 C153 C155 C156 C157 C163 C164 C172 C173 C174 C175 C201 C202 C203 C204 C205 C210 C223 C224 C227 C251 C252 C255 0CK103CK56A 0CC102CK41A 0CK103CK56A 0CC102CK41A 0CK103CK56A 0C...

Page 41: ...TION C502 C503 C504 C506 C507 C507 C508 C508 C509 C511 C512 C513 C514 C515 C516 C517 C518 C521 C522 C525 C601 C602 C603 C604 C605 C606 C607 C608 C609 C610 C611 C612 C613 C614 C615 C616 C617 C618 C619 C620 C621 C622 C623 C623 C624 C625 C626 C627 C628 C629 C630 C631 0CK473DK56A 0CE475SK6DC 0CZZ9ST027A 0CZZTAB003S 0CK103CK56A 181 091R 0CC270CK41A 0CK105DH56A 0CC270CK41A 0CK103CK56A 0CC101CK41A 0CE477...

Page 42: ...LOCA NO PART NO DESCRIPTION C727 C727 C729 C730 C733 C735 C739 C743 C744 C749 C750 C753 C756 C757 C758 C759 C760 C761 C762 C763 C764 C765 C766 C800 C801 C801 C802 C802 C803 C804 C805 C806 C806 C807 C816 C820 C821 C822 C823 C824 C825 C827 C828 C829 C830 C831 C832 C833 C834 C835 C836 C838 0CE226WF6DC 0CK105DH56A 0CK104CK56A 0CE1072D638 0CE226WF6DC 0CK104CK56A 0CK104CK56A 0CE226WF6DC 0CE226WF6DC 0CK1...

Page 43: ...50V 0603B104K500CT 100nF 10 50V MVK6 3TP16VC47M 47uF 20 16V MVK6 3TP16VC47M 47uF 20 16V MVK10TP16VC470M 470uF 20 16V LOCA NO PART NO DESCRIPTION C934 C935 C936 C937 C938 C939 C941 C942 C943 C945 C946 C947 C948 C949 C950 C951 C951 C952 C953 C953 C954 C955 C957 C957 C958 C958 C959 C960 C961 C962 C963 C964 C965 C967 C968 C969 C970 C972 C973 C974 C975 C976 C978 C979 C980 C981 C982 C983 C984 C985 C986 ...

Page 44: ...03 7071 094 D SUB 15P 2 29MM Conector DSUBA02 0915 101 D SUB 9P 2 77MM RCA86TRJ0000 0OHM 5 1 16W RCA86TRJ0000 0OHM 5 1 16W RCA86TRJ0000 0OHM 5 1 16W PRM92T1J470K 470KOHM 5 1 2W RSD02F4J100K 100KOHM 5 2W LOCA NO PART NO DESCRIPTION R152 R158 R159 R160 R213 R228 R229 R241 R260 R262 R263 R278 R285 R501 R502 R503 R504 R505 R507 R510 R601 R602 R604 R605 R606 R607 R628 R629 R630 R631 R632 R633 R634 R704...

Page 45: ...0OHM Filter BeadHB 1S2012 121JT 120OHM LOCA NO PART NO DESCRIPTION L400 L501 L502 L806 L813 L814 L815 L816 L817 L818 L819 L820 L904 L905 L906 L913 L914 L915 L916 L917 L918 L919 L920 L921 L923 L924 LF101 X600 JK100 JK101 JK102 JK103 JK105 JK106 JK300 JK302 JK400 JK800 GP1 GP2 GP3 GP4 GP5 GP6 GP7 GP8 P1 P100 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001P 6210TCE0...

Page 46: ... 08V 8P 3 96MM Conector WaferYW396 09V 9P 3 96MM Conector WaferSMW250 13P 13P 2 50MM Conector WaferYW396 03AV 2P 3 96MM Cable AssemblyRCA R A TO RCA R A UL 1365 26 Cable AssemblyGT121 HOUSING GT121 HOUSING Fuse HolderAFC 520 BAE EUN TAPING Fuse HolderAFC 520 BAE EUN TAPING Fuse Time Delay215008 CERAMIC 250V 8A Receiver ModuleKSM 2013TE2A 4 5TO5 5V Resonator CeramicCSTLS8M00G53 A0 8MHZ S W Firmware...

Page 47: ...P No 38549D0018A 1 2 2006 05 30 ...

Page 48: ...P No 38549D0018A 2 2 2006 05 30 ...

Page 49: ...SVC SHEET 38549D0018A S1 ...

Page 50: ...Oct 2006 Printed in Korea P NO 38289S0023E ...

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