LG 42LC51 Service Manual Download Page 2

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CONTENTS

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

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

SPECIFICATION ....................................................................................... 6

ADJUSTMENT INSTRUCTION ................................................................ 9

TROUBLE SHOOTING ........................................................................... 17

BLOCK DIAGRAM.................................................................................. 25

EXPLODED VIEW .................................................................................. 26

REPLACEMENT PARTS LIST ............................................................... 28

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

Summary of Contents for 42LC51

Page 1: ...V SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LP78A MODEL 42LC51 42LC51 ZA website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ... 2 CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 17 BLOCK DIAGRAM 25 EXPLODED VIEW 26 REPLACEMENT PARTS LIST 28 SVC SHEET ...

Page 3: ...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 metallic part has a ...

Page 4: ...vely obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a ground...

Page 5: ...not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced component and adjacent components and the circuit boa...

Page 6: ...H x V x D with inverter H x V H x V x D with inverter H x V LC260WX2 SLB3 LPL 26 Specification 26 27 32 37 42 wide Color Display Module 16 9 26 27 32 37 42 TFT WXGA LCD Temp 0 40 deg Humidity 0 85 Temp 20 60 deg Humidity 0 85 100 240V 50 60Hz Power on Green TBD 42 max 26 27 32 37 St By Red 1 0 W AUO Outline Dimension 26 32 37 Pixel Pitch 26 32 37 Back Light 26 32 37 CMO Outline Dimension 27 32 Pix...

Page 7: ...00 Proposed SDTV DVD 480I 525I SDTV DVD 480I 525I SDTV DVD 576I 625I 50Hz SDTV 480P SDTV 480P SDTV 576P 50Hz HDTV 720P HDTV 720P HDTV 720P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz H freq kHz 15 73 15 75 15 625 31 47 31 50 31 25 44 96 45 00 37 50 33 72 33 75 28 125 Resolution 720 480 720 480 720 576 720 480 720 480 720 576 1280 720 1280 720 1280 720 1920 1080 1920 1080 1920 1080 Pixel clock MHz 1...

Page 8: ...P 50Hz HDTV 1080I HDTV 1080I HDTV 1080I 50Hz HDTV 1080P HDTV 1080P HDTV 1080P 50Hz H freq kHz 15 75 15 73 15 625 31 47 31 50 31 25 44 96 45 00 37 50 33 72 33 75 28 125 67 432 67 5 56 250 Resolution 720 480 720 480 720 576 720 480 720 480 720 576 1280 720 1280 720 1280 720 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 Pixel clock MHz 13 514 13 500 13 500 27 000 27 027 27 000 74 176 74...

Page 9: ...stment items 3 1 PCB assembly adjustment items 1 Download the VCTP main software IC500 VCT_Pro 2 Channel memory IC501 EEPROM 3 Color carrier Adjustment 3 2 SET assembly adjustment items 1 DDC Data input 2 Adjustment of White Balance 3 Factoring Option Data input 4 PCB assembly adjustment method Using VCTP Download program 4 1 Download program installation 1 Extract a Zip file 2 Visual I2C LPT Driv...

Page 10: ...Connect the download jig to D sub jack 2 Execute Download vi2c program in PC then a main window will be opened 3 Double click the blue box and confirm Bootloader Version as 42 4 Click the Erase Flash button 5 Double click the download file low then edit window will be opened 6 Click the choice button in the edit window then file choice window will be opened 7 Choose the Hex file in folder and exec...

Page 11: ...ig to D sub jack 2 Supply the power Stand by 5V and wait for 3 seconds 3 Push the S W off Disconnect SCL to GND using switch at jig 4 Execute Download vi2c program in PC then a main widow will be opened 5 Double click the blue box and confirm Bootloader Version as 42 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 th...

Page 12: ...wnload method 3 SET 1 Push the Tilt button in an Adjust Remocon Then the LCD TV 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 Bootl...

Page 13: ...ick OK button at the edit window 11 Downloading 12 If download is failed for example No acknowledge from slave execute download again from 1 4 3 Channel memory download 1 Connect the download jig to D sub jack 2 Execute Channel vi2c program in PC then a main window will be opened 3 Push the button change and select the Channel memory data 4 Check the communication is OK or not Push the Read area A...

Page 14: ...lor Bar MA NTSC Digital Pattern with color Bar 2 push the adj key in the adjustment remocon 5 EDID The Extended Display Identification Data DDC Display Data Channel download Caution Use the proper signal cable for EDID Download Never connect HDMI D SUB Cable at the same time Use the proper cables below for EDID Writing EDID Data EDID DATA Analog Set 128bytes EDID DATA HDMI Set 256bytes Tool Option...

Page 15: ... CA 210 or same product 3 Auto W B adjustment instrument only for Auto adjustment 6 2 Connecting diagram of equipment for measuring For Automatic Adjustment 1 Enter the DDC adjust mode Enter the DDC adjust mode at the same time heat run mode when pushing the power on by power only key Enter the adjust mode and change the input mode to AV ZA AV3 TA MA AV2 when pushing the Front av key Maintain the ...

Page 16: ...e Mode Standard ZA TA Optimum MA Color Temp Normal Normal 9300K x 0 283 0 003 y 0 298 0 003 Luminance Y AV upper 150 cd m2 Typ 350 cd m2 Reference Value Automatically fixed Cool 11000K x 0 274 0 003 y 0 286 0 003 Warm 7200K x 0 303 0 003 y 0 319 0 003 Pattern for Adjustment of White Balance 7 When adjustment is completed Exit adjustment mode using EXIT key on R C 6 4 Input the Shipping Option Data...

Page 17: ...r cord inserted Connect a cable Plasma CN1 LCD SC100 No Yes Is the Line Filter and PSU connected Replace the fuse No Yes Is the fuse of PSU normal Plasma F101 LCD f100 Connect the 13 14pin cable After all cables connect is removed to PSU the AC voltage marking is authorized on manual When ST by 5V is not operated replace PSU No Yes Is it connected that PSU and 13 14pin cable in VSC board ...

Page 18: ...ace Y Board After connecting well each connector the normality it operates Yes No No Is the Y Board normal Is the fuse FS2 FS3 on Y B D normal Is the output voltage normal after remove P1 connector of Y B D Yes No No Replace Z Board Is the Z Board normal Is the fuse FS1 FS2 on Z B D normal Is the output voltage normal after remove P1 connector of Z B D Yes No No Is the X Board normal Is the output...

Page 19: ...r VaVs on Is output the normality Low High voltage except Stand by 5V Yes No No Is the Link cable normal Yes Is the IC500 s output normal Reconnect the link cable in P803 Plasma P804 LCD No Replace the VSC No Yes Check the power Is video output of the Tuner normal Check TU400_Pin13 Is the input voltage normal Check Pin3 Is the I2C communication normal Check Pin9 Pin10 Yes No Yes Is the LVDS Cable ...

Page 20: ...the input source No 6 In case of becomes unusual display from Side AV mode Is video input of the A V jack normal Check CN703 Pin9 Yes Sam as Block A Check the input source No 7 In case of becomes unusual display from Side S Video mode Is video input of the A V jack normal Check CN703 Pin9 Yes Sam as Block A Check the input source No ...

Page 21: ...he input source No 9 In case of becomes unusual display from SCART 1_RGB mode Is video input of the A V jack normal Check R110 R170 R171 R173 Yes Sam as Block A Check the input source No 10 In case of becomes unusual display from SCART 2 mode Is video input of the A V jack normal Check R174 Yes Sam as Block A Check the input source No ...

Page 22: ...nput source No 12 In case of becomes unusual display from component 2 mode Yes Change IC IC500 Check the input source No Is video input of the A V jack normal Check R241 R242 R243 13 In case of becomes unusual display from RGB mode Yes Change IC IC500 Check the input source No Is R G B input and H V sync of the JK201 normal Check R220 R221 R253 R254 R255 ...

Page 23: ...HDMI is no sound Yes Only AV COM2 PC input is no sound Is the output of IC600 R607 R608 normal Yes Only RF is no sound No No No No Download the EDID data Set on speaker in menu No Replace IC600 No Check the Speaker cable No IC500 operae nor mall Replace IC500 No Yes IC601 operae nor mall Replace IC601 Replace VSC BD Yes Check the signal after IC600 refer to circuit diagrma Check the Tuner In Out N...

Page 24: ...t 4 HDCP authen attempted Reset TMDS power down on register 0x60 offset 0x3f 0xff Check HDMI source Change another source or cable Yes Is wave continuous Normal video Normal audio No Yes Replace IC303 No 1 Check TV input mode HDMI 1 port support HDMI and DVI So if you input DVI signal and PC audio from phone jack You can hear PC audio 2 Uuplug and plug HDMI cable sometimes ESD surge occurred at HD...

Page 25: ... 25 HDMI BLOCK DIAGRAM ...

Page 26: ... 26 EXPLODED VIEW 300 200 820 120 510 520 900 840 550 530 540 560 810 830 400 ...

Page 27: ...26LCD Model CONTROL 530 EAY34797001 Power Supply Assembly Tornado 42inch 42INCH Tornado 42inch LCD LGIT LCD Tornado 42inch Power Inverter PSU LG INNOTEK LTD 540 EBR35843704 PCB Assembly MAIN T T LP78A 42LC4R ZA Total For CKD From China To WR 550 EBT36115601 Chassis Assembly POWER SMPS LP78A 37 42 LCD AC Inlet Assembly 560 EBR36575401 PCB Assembly SUB T T LP78A H4 EU SIDE AV 810 AGU32559808 Plate A...

Page 28: ...CE227SF6DC Capacitor AL Chip MVG6 3TP16VC220M 220uF C821 0CE477WF6DC Capacitor AL Chip MVK10TP16VC470M 470uF 2 C824 0CE476SF6DC Capacitor AL Chip VMV476M016S0ANC010 47uF C825 0CE107SF6DC Capacitor AL Chip VMV107M016S0ANE010 100u C825 0CE107WF6DC Capacitor AL Chip MVK6 3TP16VC100M 100uF C828 0CE107WF6DC Capacitor AL Chip MVK6 3TP16VC100M 100uF C828 0CE227WF6DC Capacitor AL Chip MVK8 0TP16VC220M 220...

Page 29: ...K104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C549 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C550 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C551 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C552 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C553 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 10 C554 0CK104CK56A Capaci...

Page 30: ...r Ceramic Chip 0603B103K500CT 10nF 10 C840 0CK272CK46A Capacitor Ceramic Chip 0603B272J500CT 2 7nF 10 D803 0DR340009AA Diode Schottky MBRS340 525MV 40V 4A 0S D224 0DSIH00028A Diode Switching MC2838 T112 1 1 2V 75V D300 0DSIH00028A Diode Switching MC2838 T112 1 1 2V 75V D301 0DSIH00028A Diode Switching MC2838 T112 1 1 2V 75V D302 0DSIH00028A Diode Switching MC2838 T112 1 1 2V 75V D600 0DSIH00028A D...

Page 31: ... HH 1M2012 121JT H 1mm L705 6200J00005N Filter Bead HH 1M2012 121JT H 1mm L706 6200J00005N Filter Bead HH 1M2012 121JT H 1mm L707 6210TCE001A Filter Bead HB 1S2012 080JT 8OHM 2X L708 6210TCE001A Filter Bead HB 1S2012 080JT 8OHM 2X L709 6210TCE001A Filter Bead HB 1S2012 080JT 8OHM 2X L800 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L801 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L802 6210TCE...

Page 32: ... 1KOHM 5 R107 0RH3301D622 Resistor Chip MCR10EZHJ332 3 3KOHM 5 R107 0RJ0752D677 Resistor Chip MCR03EZPJ750 75OHM 5 1 R108 0RH0000D622 Resistor Chip MCR10EZHJ000 0OHM 5 1 R108 0RH0332D622 Resistor Chip MCR10EZHJ330 33OHM 5 1 R108 0RH9101D622 Resistor Chip MCR10EZHJ912 9 1KOHM 5 R108 0RJ2203D677 Resistor Chip MCR03EZPJ224 220KOHM 5 R109 0RH0752D622 Resistor Chip MCR10EZHJ750 75OHM 5 1 R109 0RJ2203D6...

Page 33: ...M 5 1 R316 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R317 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R318 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R319 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R320 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R321 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R322 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 1 R323 0RJ0122D677...

Page 34: ...M 5 1 R543 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 1 R544 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 1 R545 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 1 R546 0RJ4701D677 Resistor Chip MCR03EZPJ472 4 7KOHM 5 R547 0RJ4701D677 Resistor Chip MCR03EZPJ472 4 7KOHM 5 R548 0RJ1000D677 Resistor Chip MCR03EZPJ101 100OHM 5 R549 0RJ1000D677 Resistor Chip MCR03EZPJ101 100OHM 5 R550 0RJ1000D677 R...

Page 35: ...k DIN DC1R019WDH SOCKET 21P JK204 6612F00099A Jack Phone PEJ024 01 1P 4P STRAIGH JK200 6612J10031A Jack RCA PPJ209 02 14 0MM 1RX5C JK600 6612J10043A Jack RCA PPJ200 07 15MM 1RX4C AN JK100 6612M00010A Jack Scart PSC003 01 21P 21P 1C 3 JK101 6612M00010A Jack Scart PSC003 01 21P 21P 1C 3 D800 0DL233309AC LED Chip SAM2333 RED Y GREEN 2 7 D100 0DLBE0138AA LED DIP BL BUBGE301 ROUND 3MM S SW1 SAA30632022...

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Page 39: ...Mar 2007 Printed in Korea P NO MFL36696929 ...

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