LG 42LB9R Service Manual Download

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LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LP78A

MODEL : 42LB9R

42LB9R-TD

Summary of Contents for 42LB9R

Page 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LP78A MODEL 42LB9R 42LB9R TD ...

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: ... 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 DDC adjust mode with same condition of Heat run Maintain after AC off on in status of Heat run pattern display 2 Release the DDC adjust mode Release the adjust mode after AC off on or std by off on in status of finishing the Hear run mode Release the Adj...

Page 16: ...ed Gain 80 Green Gain 80 Blue Gain 80 Red Offset 80 Green Offset 80 Blue Offset 80 Target Value Picture 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...

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 300 700 200 800 804 803 805 806 802 801 807 809 500 510 520 808 120 120 600 610 530 400 910 900 ...

Page 27: ...NG TELECOM CO LTD 610 EBR38690501 PCB Assembly Main MAIN T T LP78A 42LB9R NON EU MAIN Total 700 6500VR0003E Sensor Ambient Light YGCA T071C 12 HOUSING BK 26 4X20X26 4mm VOUT 5V AT 80LUX LG INNOTEK CO LTD 800 MJH37063701 Supporter PRESS EGI 1t Supporter EGI TOP BAR 801 MGJ32902409 Plate PRESS EGI 1 6 FRAME SBHG A 42LB9 802 MJH34248201 Supporter PRESS EGI 1 2 GUIDE EGI METAL BAR LEFT FOR V668 MODULE...

Page 28: ...K10TP16VC470M 470uF C824 0CE476SF6DC Capacitor AL Chip VMV476M016S0ANC010 47u C825 0CE107WF6DC Capacitor AL Chip MVK6 3TP16VC100M 100uF C828 0CE107WF6DC Capacitor AL Chip MVK6 3TP16VC100M 100uF C830 0CE107WF6DC Capacitor AL Chip MVK6 3TP16VC100M 100uF C832 0CE107SF6DC Capacitor AL Chip VMV107M016S0ANE010 100 C640 0CE477BJ618 Capacitor AL Radial ESM477M035T1G5H20G 470 C641 0CE477BJ618 Capacitor AL ...

Page 29: ...470nF C522 0CK474CH94A Capacitor Ceramic Chip 0603F474Z250CT 470nF C525 0CK474CH94A Capacitor Ceramic Chip 0603F474Z250CT 470nF C526 0CK474CH94A Capacitor Ceramic Chip 0603F474Z250CT 470nF C528 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C529 0CK332CK56A Capacitor Ceramic Chip C1608X7R1H332KT 3 3nF C530 0CK332CK56A Capacitor Ceramic Chip C1608X7R1H332KT 3 3nF C531 0CK332CK56A Capacit...

Page 30: ...Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C827 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C829 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C831 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C833 0CK104CK56A Capacitor Ceramic Chip 0603B104K500CT 100nF 1 C834 0CK475EF67A Capacitor Ceramic Chip C3216X5R1C475MT 4 7uF C835 0CK475EF67A Capacitor Ceramic Chip ...

Page 31: ...ter Bead HH 1M3216 501JT 500OHM L501 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L503 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L508 6210TCE001B Filter Bead HH 1H3216 500JT 50OHM L509 6210TCE001B Filter Bead HH 1H3216 500JT 50OHM L510 6210TCE001B Filter Bead HH 1H3216 500JT 50OHM L511 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L512 6210TCE001G Filter Bead HH 1M3216 501JT 500OHM L602 62...

Page 32: ...OHM 5 1 R110 0RJ0000D677 Resistor Chip MCR03EZPJ000 0OHM 5 1 R113 0RJ0000D677 Resistor Chip MCR03EZPJ000 0OHM 5 1 R120 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R122 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R133 0RJ4701D677 Resistor Chip MCR03EZPJ472 4 7KOHM 5 R141 0RJ4701D677 Resistor Chip MCR03EZPJ472 4 7KOHM 5 R148 0RJ0000D677 Resistor Chip MCR03EZPJ000 0OHM 5 1 R149 0RJ0000D677 Resi...

Page 33: ...12OHM 5 R327 0RJ0122D677 Resistor Chip MCR03EZPJ120 12OHM 5 R328 0RJ2001D677 Resistor Chip MCR03EZPJ202 2KOHM 5 R329 0RJ2001D677 Resistor Chip MCR03EZPJ202 2KOHM 5 R330 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R331 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R332 0RJ1000D677 Resistor Chip MCR03EZPJ101 100OHM 5 R333 0RJ1000D677 Resistor Chip MCR03EZPJ101 100OHM 5 R334 0RJ1000D677 Resistor ...

Page 34: ...3KOHM 5 R564 0RJ3001D677 Resistor Chip MCR03EZPJ302 3KOHM 5 R570 0RJ0000D677 Resistor Chip MCR03EZPJ000 0OHM 5 1 R573 0RJ2702D677 Resistor Chip MCR03EZPJ273 27KOHM 5 R574 0RJ1002D677 Resistor Chip MCR03EZPJ103 10KOHM 5 R6 0RH0000D622 Resistor Chip MCR10EZHJ000 0OHM 5 1 R600 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R601 0RJ1001D677 Resistor Chip MCR03EZPJ102 1KOHM 5 R602 0RJ1000D477 Resistor ...

Page 35: ...RCA PPJ200 07 15MM 1RX4C A D800 0DL233309AC LED Chip SAM2333 RED Y GREEN 2 D100 0DLBE0138AA LED DIP BL BUBGE301 ROUND 3MM IC100 6712000013A Receiver Module TSOP4438SO1 4 5TO5 5V SW1 SAA30955104 S W Firmware 3 17 7773 WORLD WIDE F SW101 140 313B Switch Tact KPT 1115AM 1C1P 12VDC SW102 140 313B Switch Tact KPT 1115AM 1C1P 12VDC SW103 140 313B Switch Tact KPT 1115AM 1C1P 12VDC SW104 140 313B Switch T...

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Page 39: ...Jul 2007 Printed in Korea P NO MFL36696941 ...

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