LG M237WD-PMJ Service Manual Download Page 1

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LCD MONITOR TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LD84J

MODEL : M237WD

M237WD-PMJ

North/Latin America

http://aic.lgservice.com

Europe/Africa

http://eic.lgservice.com

Asia/Oceania

http://biz.lgservice.com

Internal Use Only

Summary of Contents for M237WD-PMJ

Page 1: ...FORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD84J MODEL M237WD M237WD PMJ North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...rved Only for training and service purposes LGE Internal Use Only C 2009 2 CONTENTS CONTENTS 2 PRECAUTIONS 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 12 TROUBLE SHOOTING 15 BLOCK DIAGRAM 24 DESCRIPION OF BLOCK DIAGRAM 25 EXPLODED VIEW 26 SVC SHEET ...

Page 3: ...ld 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 return pat...

Page 4: ...e on your body by touching a known earth ground Alternatively 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 charg...

Page 5: ... the solder joints of the two original leads If they are 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 repla...

Page 6: ...n by part number in accordance with BOM 2 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 Test method 3 1 Performance LGE TV test method followed 3 2 Demanded other specification Safety UL CSA IEC specification EMC FCC ICES IEC specification 4 General Specification 4 1 PC No Item Specification Remarks 1 Supported Sync Type Separate Sync Digital 2 Operating Frequency ...

Page 7: ...p Down 60 70 75 85 2 Luminance Luminance 25 0 300 DVI or RGB cd m2 Stnadard 6500K Full White 100IRE Variance 75 3 Contrast Ratio CR 600 1000 Full White Full black 4 Color Coordinates White Wx 0 313 CIE 1931 Wy 0 329 RED Rx Typ 0 644 Typ DVI or RGB Ry 0 336 0 03 Stnadard 6500K Green Gx 0 295 Full White 100IRE Gy 0 614 Blue Bx 0 146 By 0 072 Optical Test Condition Surrounding Brightness Level dark S...

Page 8: ...0 300 600 1 1000 1 DFC 30 000 1 No Item Luminance cd m2 C R Min Remark Min Typ Max RF AV COMPONENT HDMI 1 23 inch 170 220 400 1 6 2 AV Mode Measurement Condition Full white 100IRE Vivid Measure the black luminance after 30 seconds No Item Min Typ Max Remark 1 M237WD PMJ 24000 1 30000 1 For Checking Black Luminance wait for over 1 minute 6 3 Dynamic CR Dynamic CR Working Condition Full Black Patter...

Page 9: ...80P 11 1920 1080 67 43 59 94 HDTV 1080P 12 1920 1080 67 5 60 HDTV 1080P 8 Component Video Input Y PB PR 10 RGB DVI 10 1 Input PC No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 400 31 468 70 08 28 321 2 640 480 31 469 59 94 25 175 Input 848x480 60Hz 852x480 60Hz 640x480 60Hz Display 3 640 480 37 5 75 31 5 4 800 600 37 879 60 317 40 0 5 800 600 46 875 75 0 49 5 6 1024 768 48 363 60 ...

Page 10: ... Supported No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 480 31 469 31 5 59 94 60 23 00 23 03 SDTV 480P 2 720 576 31 25 50 54 SDTV 576P 3 1280 720 37 500 50 74 25 HDTV 720P 4 1280 720 44 96 45 59 94 60 74 17 74 25 HDTV 720P 5 1920 1080 33 72 33 75 59 94 60 74 17 74 25 HDTV 1080I 6 1920 1080 28 125 50 00 74 25 HDTV 1080I 7 1920 1080 26 97 23 23 97 24 74 17 74 25 HDTV 1080P 8 1920 ...

Page 11: ...and service purposes LGE Internal Use Only C 2009 2 HDMI2 11 2 EDID Data HDMI EDID Product ID 22253 HDMI1 and HDMI2 have the Same EDID 1 HDMI1 1 All data are HEXA 2 Adjustable Data Serial No week year ex when year 2008 input 12 CHECK SUM deferent along Serial No week year ...

Page 12: ... message If display Error Check connect computer jig and set 3 Click Connect tab If display Can t Check connect computer jig and set 4 Click Read tab and then load download file XXXX bin by clicking Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message 3 1 ADC Process 3 1 1 PC input ADC 3 1 1 1 Auto RGB Gain Offset Adjustment Convert to PC in Input source I2C COMM...

Page 13: ... Input mode to RGB Set Temperature 9300K Adjust x 0 285 0 005 y 0 293 0 005 9300 K Full white MSPG series Pattern 4 4 3 Check color coordinate of 6500K Set Input mode to RGB Set Temperature 6500K Adjust x 0 313 0 005 y 0 329 0 005 6500 K Full white MSPG series Pattern 4 4 4 DPM operation confirmation Only Apply for MNT Model Check if Power LED Color and Power Consumption operate as standard Set In...

Page 14: ... Read E7 00 00 EEPROM Read 5 EEPROM Write E8 00 Data EEPROM Write by some values 6 COLOR SAVE R G B cutoff Drive Contrast Bright EB 00 Save 7 20 00 00 100 8 V POSITION 30 00 00 100 9 CLOCK 90 00 00 100 10 PHASE 92 00 00 100 They have different range mode FOS Adjustment 11 R DRIVE 16 00 00 FF 12 G DRIVE 18 00 00 FF 13 DRIVE 1A 00 00 FF Drive adjustment 14 R CUTOFF 80 00 00 7F 15 G CUTOFF 82 00 00 7...

Page 15: ...NG 1 Power Up Boot Fail Trouble Shooting Check P700 All Voltage Level 5V 15V Check Pow er con nector OK Replace Power board Y N Check IC705 2 Pin Voltage Level 3 3V Replace IC 705 Recheck Y N Check X101 Clock 12MHz Replace X 101 Y N Replace IC 106 Flash Memory Check Q702 Outp ut Voltage Level 5V Replace Q702 N Y Wave form of X101 N ...

Page 16: ... 8 TXEC 9 TXEC 20 TXOC 21 TXOC IC101 has problem Check L VDS Cable for damage or open con ductors Check L CD Module Control board Refer to Module CAS Y N Y Replace Ca ble N Y 1 Check Po wer Board 15V 2 Check Q702 Output voltage 5V 3 Check P302 1 2 3 5V 1 Replace Power Board 2 Replace Q702 N Check P70 0 9 INV_ON high Check GPIO Path Refer to Appe ndix 1 N Y ...

Page 17: ...Data Sync R440 R441 R442 Maybe Tun er TU400 has problems Check IC10 1 LVDS output 8 TXEC 9 TXEC 20 TXOC 21 TXOC Y N Check Tu ner 5V Power Q707 5V Replace Q7 07 Y N Y Replace IC101 has problems N Y Check L D400 color Bad Tun er Replace Tuner None Yello w none Check Demod ulator Input Clock X400 25MHz Replace X400 N Y Check L CD Module Control board Refer to Mo dule CAS Wave form of X400 ...

Page 18: ...Trouble Shooting Check inpu t signal for mat Is it supported Check signal C124 C126 C129 Check R10 7 R109 R112 C124 C126 C129 Y N Check J K602 Replace JK602 or Che ck Divice Y N Y IC101 has problem Y Check Compo nent Cab le Wave form of C124 Wave form of C126 Wave form of C129 Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr ...

Page 19: ...mat Is it supported Check signal Hsync Vsync R673 R674 Replace R6 73 R674 Check signal RGB R119 R104 R105 C121 C122 C119 Y N Check JK607 Replace JK607 Y N Y Replace R119 R104 R105 C121 C122 C119 N IC101 has problem Y Check RGB Cable connector for damage Y Wave form of R673 Vsync Wave form of R673 Vsync Wave form of R104 C121 Wave form of R105 C122 Wave form of R119 C119 ...

Page 20: ...npu t signal for mat Is it supported Check signal RGB R116 R113 R114 C137 C134 C135 Replace R1 16 R113 R114 C137 C134 C135 Y N Check signal R611 AV_CVBS R625 R626 S_Video Replace R6 11 R625 R626 Y N Y IC101 has problem Check AV Ca ble S Video Cable f or damage or open conn ector Y Wave form of R626 S video Wave form of R611 CVBS Wave form of R625 S video ...

Page 21: ...t supported Y Check JK801 JK802 for proper connectio n or damage Replace c onnector Y N Y Check HDMI Cable for damage or open conn ector Check EDID NVRAM IC801 IC802 Power I2C Signal 5 6 Redownload EDID data or Rep l ace IC801 IC802 Y N Check HDCP Key NVRAM IC105 Power I2C Signal 5 6 Replace IC105 Y N Check IC803 Out Voltage Level 3 3V Pin 6 Replace IC803 Y N Replace Ms tar IC101 ...

Page 22: ... port the au dio sig nal norm ally Check Speaker and it s wire con nectio n P500 And the resistance Check Sig nal from IC501 L502 L503 L504 L505 Y Replace IC 500 N Check 15V From Po wer board P700 Pin 1 2 And Check Aud io Amp Pow er 12V IC501 Pin 2 3 34 35 40 41 44 45 Y Replace P ower Board or Check L511 N Y Check Sig nal from IC101 R130 R131 R1021 R1022 Y Replace IC 101 N Replace co nnector or Sp...

Page 24: ...CH DUAL FET PANEL_CTL POWER_ON OFF 5V 24C02BN EEPROM DDC HDMI3_5V_DET HPD 24C02BN EEPROM PC_AUD SCART_LRIN CVBS_LR_IN TV_VOUT DDC 24C64 EEPROM IIC_TUNER RS232C RX TX IC700 RXD TXD DDR MADR 0 11 MDATA 0 15 SW_RESET IIC_AMP I2S PSU INV_CTL DIMMING 5V_ST MX25L1605 AM2C 15G SPI_CZ CLK SPI_D AMP GAIN X 4 LGE6991DD MSTAR MAX3232CDR TMDS351PAG HYB25DC256163CE 4 HDMI 1 2 TMDS DDC HPD_S W AV DVI D PC Only ...

Page 25: ...nput supporting 480P HDMI 1 2 Digital signal input Included Audio 1 3 RF ATSC NTSC Input ATSC NTSC Input 1 4 Audio Input Component L R Audio L R Stereo For PC input 2 Output Interface Video The video signal goes to LGE1854C Scaler Frame Memory 210MHz converted LVDS signal Module Audio The audio is divided Digital signal at Scaler go through NTP3000A Audio Amp IC and generate to Speaker Head phone ...

Page 26: ...al 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...

Page 37: ...Jan 2009 Printed in Korea P NO MFL49414510 ...

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