LG 37LG3000 Page 1 Service Manual Download

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LCD TV

SERVICE MANUAL

CAUTION

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

CHASSIS : LD84A

MODEL : 37LG3000

37LG3000-ZA

website:http://biz.LGservice.com

Internal Use Only

Summary of Contents for 37LG3000

Page 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD84A MODEL 37LG3000 37LG3000 ZA website http biz LGservice com Internal Use Only ...

Page 2: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 13 TROUBLE SHOOTING 18 BLOCK DIAGRAM 23 EXPLODED VIEW 24 SVC SHEET ...

Page 3: ...fe to operate without damage of electrical shock 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 term...

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 replac...

Page 6: ... 983 0 H x 576 0 V x 52 7 D With inverter 9 Pixel Pitch 37 200 x 600 x RGB LG3000 42 0 227 x 0 681 x RGB 10 Back Light 37 16 Lamp EEFL LG3000 42 18pcs Straight type 11 Display Colors 16 7M 16 777 216 12 Coating 3H AG 1 Application Range This spec sheet is applied to the 37 42 LCD TV used LD84A chassis 2 Specification Each part is tested as below without special appointment 2 1 Temperature 25 5 C 7...

Page 7: ... scart and support RF OUT analog Scart 2 jack is Half scart and support MNT DTV OUT 4 Video Input RCA 1EA PAL SECAM NTSC 4 System PAL SECAM NTSC PAL60 5 S Video Input 1EA PAL SECAM NTSC 4 System PAL SECAM NTSC PAL60 6 Component Input 1EA Y Cb Cr Y Pb Pr 7 RGB Input RGB PC Analog D SUB 15PIN 8 HDMI Input 3EA HDMI1 DTV DVI PC HDMI version 1 3 HDMI2 DTV Support HDCP HDMI3 DTV 9 Audio Input 3EA RGB DV...

Page 8: ...lues specified are at approximate distance 40Cm from the LCD surface 4 Ta 25 C Vcc 12 0V VIVN 24 0Hz VBRT 3 3V Timing 60Hz typ value 5 Measurement condition Set the value of VBRT to maximum luminance of white No Item Specification Min Typ Max Remark 1 Viewing Angle CR 10 Right Left Up Down 89 2 Luminance Luminance cd m2 400 500 Variation 1 3 MAX MIN 3 Contrast Ratio CR 1000 1500 4 CIE Color Coordi...

Page 9: ... 647 59 988 138 625 WUXGA FHD Model only 7 SET Optical Feature Measurement Condition Full white Dynamic Measure the black luminance after 30 seconds No Item module Luminance min C R min Remark AV COMPONENT HDMI AV COMPONENT HDMI 1 37 inch LPL 400cd m2 1000 LG3000 2 42 inch AUO 400cd m2 1000 C R is excepted for PC mode No Specification Remark Resolution H freq kHz V freq Hz 1 720x480 15 73 60 00 SD...

Page 10: ...80I HDCP 12 1920 1080 33 75 60 00 74 250 HDTV 1080I HDCP 13 1920 1080 28 125 50 00 74 250 HDTV 1080I 50Hz HDCP 14 1920 1080 27 000 24 00 74 250 HDTV 1080P 24Hz HDCP 15 1920 1080 56 250 50 148 500 HDTV 1080P 50Hz HDCP 16 1920 1080 67 433 59 94 148 352 HDTV 1080P HDCP 17 1920 1080 67 500 60 148 500 HDTV 1080P HDCP No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 720 400 31 468 7...

Page 11: ...mark 1 Product Widt W Length D Height H mm Dimension Before Packing 936 4 293 8 684 4 mm With Stant After Packing 1195 253 665 mm 2 Product Only SET 18 3 Kg With BOX 23 Kg 12 2 42LG3000 No Item Content Unit Remark 1 Product Widt W Length D Height H mm Dimension Before Packing 1032 8 293 8 742 3 mm With Stant After Packing 1330 257 772 mm 2 Product Only SET 23 6 Kg With BOX 28 5 Kg ...

Page 12: ...220V 60Hz 2 6 Adjustment equipments Color Analyzer CA 210 or CA 110 Pattern Generator MSPG 925L or Equivalent DDC Adjustment Jig equipment SVC remote controller 2 7 Don t push The IN STOP KEY after completing the function inspection 3 Main PCB check process O APC After Manual Insult executing APC O Download 1 Execute ISP program Mstar ISP Utility and then click Config tab 2 Set as below and then c...

Page 13: ...N again 1 Push IN START key in service remote controller 2 Select Tool Option 1 and Push OK button 3 Punch in the number Each model has their number 4 Completed selecting Tool option 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 Signal equipment displays Output Voltage 700 mVp p Impress Resolution XGA 1024 x 768 60Hz Model 60 in Pattern Ge...

Page 14: ...s executed by Remote controller 4 Total Assembly line process 4 1 Adjustment Preparation W B Equipment condition CA210 CH 9 Test signal Inner pattern 85IRE Above 5 minutes H run in the inner pattern power on key of adjust remote control 15 Pin D Sub Jack is connected to the AUTO W B EQUIPMENT Adjust Process will start by execute I2C Command Inner pattern 0xF3 0xFF Adjust Process will finish by exe...

Page 15: ...nfirm DPM operation at the state of screen without Signal 4 3 DDC EDID Write RGB 128Byte Connect D sub Signal Cable to D Sub Jack Write EDID DATA to EEPROM 24C02 by using DDC2B protocol Check whether written EDID data is correct or not 4 4 DDC EDID Write HDMI 256Byte Connect HDMI Signal Cable to HDMI Jack Write EDID DATA to EEPROM 24C02 by using DDC2B protocol Check whether written EDID data is co...

Page 16: ... 1E 20 20 6E 28 55 00 C4 8E 21 00 00 1E 01 1D 80 18 71 1C 30 16 20 58 2C 25 00 C4 8E 21 00 00 9E 8C 0A D0 8A 40 20 E0 2D 10 10 3E 96 00 C4 8E 21 00 00 18 8C 0A 50 D0 8A 20 E0 2D 10 10 3E 96 00 13 8E 21 00 00 18 60 26 36 80 A0 70 38 1F 40 30 20 25 00 C4 8E 21 00 70 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 00 2F 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 00...

Page 17: ...The adjustment condition should be set by the Power On key 2 Press the ADJ of the R C to enter into EZ ADJUST 3 Select 10 TEST PATTERN with the CH key and press the Enter key for 30 minutes or longer to perform the heat run 4 Perform the zero calibration of the Color Analyzer and fix the sensor with the 10cm or less distance at the center of the LCD module surface when adjusting 5 Press the ADJ of...

Page 18: ... inserted into the set When it is disconnected or loosened test after inserting it 2 Perform the automatic test on the GND resisting pressure The set with power cord the cord and the A V completely inserted into the tuner is loaded on the pallet and entered into the automatic test process Connect the D terminal AV JACK tester Turn on the automatic GWS103 4 Perform the GND TEST If it is not good th...

Page 19: ...6GMF IC4015 Power supply 5V P4004 Pin 3 SCL D sub Pin 10 SDA D sub Pin 7 10 5 How to adjust for downloading 1 fter executing LGE Monitor Tools v1 1 click the first icon See the figure 2 When the screen is displayed as shown at the below figure set the items as follows MCU Select MTV512M64 R W Option Auto Write Verify Jig Option Myson Transmit Speed Medium Check blank PORT Select the Parallel Port ...

Page 20: ... proceeded as shown at the below screen and when it is ended turning on off is automatically done When the automatic proceeding is not smoothly done manually perform the power On Off 5 When downloading is ended remove the USB Memory Stick from the USB jack 6 Press the IN START button of the remote controller to check the upgraded S W version TV Software Upgrade Current TV Software Version Informat...

Page 21: ...0 Especially you should check The H V sync and clock Can you see the normal waveform YES YES NO Could you measure voltage of TU800 IIC lines Are they all normal YES NO You should check power line IIC lines YES You should replace TUNER NO You should decide to replace TR Q503 or not NO After checking the Power of Main IC IC100 you should decide to replace Main IC or not This board has big problem be...

Page 22: ... they all normal NO You should check power line IIC lines YES You should replace TUNER YES Check the output of Main IC IC100 Especially you should check The H V sync and clock Can you see the normal waveform YES NO After checking the Power of Main IC IC100 you should decide to replace Main IC or not This board has big problem because Main IC IC100 have some troubles After checking thoroughly all p...

Page 23: ... have problem Replace this Jack or SIDE AV NO After checking the Power of AV switch you should decide to replace AV switch or not Check the output of Main IC IC100 Especially you should check The H V sync and clock Can you see the normal waveform YES NO After checking the Power of Main IC IC100 you should decide to replace Main IC or not This board has big problem because Main IC IC100 have some t...

Page 24: ...Jack NO After checking the Power of component Audio switch you should decide to replace component Audio switch or not NO After checking the Power of component Audio switch you should decide to replace component Audio switch or not Check the output of Main IC IC100 Especially you should check The H V sync and clock Can you see the normal waveform YES NO After checking the Power of Main IC IC100 you...

Page 25: ... Audio switch or not NO After checking the Power of RGB Audio switch you should decide to replace RGB Audio switch or not Check the output of Main IC IC100 Especially you should check The H V sync and clock Can you see the normal waveform YES NO After checking the Power of Main IC IC100 you should decide to replace Main IC or not This board has big problem because Main IC IC100 have some troubles ...

Page 26: ...nd power of HDMI Switch you should decide to replace HDMI Switch or not NO NO After checking the Power of this chip you should decide to replace this or not After checking the Power of HDMI Switch you should decide to replace MST3361 or not YES Check HDCP communication lines IC902 NO After checking the Power of this chip you should decide to replace this or not Check the output of Main IC IC100 Es...

Page 27: ... DSUB_H V_SYNC MAX3232 IC702 DDC UART Tx Rx HDMI Switch IC902 EEPROM HDMI_I2C HDMI_I2C_0 HDMI_CEC Rx HPD TMDS x3 HPD x3 HDMI_CEC x3 USB_DM DP 5V_HDMI PCM_ADD PCM_DATA TS_Parallel TU_TS_DATA KIC7SZ32FU IC802 PCM_CD_ON CI_CD_1 2 IIS MUTE LED_G R IR Flash Memory 4MB IC101 SC1_CVBS_IN SC2_CVBS_IN SC1_TV_VOUT DTV MNT_V_OUT SC1_L R_IN TV_L R_OUT DTV MNT_L R_OUT LCD Panel 52 47 42 37 FHD 32 HD RESET I2C ...

Page 28: ...t 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 28 EXPLODED VIEW 801 803 805 806 804 802 550 830 540 821 400 530 522 300 120 122 510 500 901 900 121 200 ...

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Page 32: ...Feb 2008 Printed in Korea P NO MFL41037108 ...

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