LG M2794DP Service Manual

Lcd monitor tv

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Owner's manual (113 pages)

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Page 1 Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD MONITOR TV SERVICE MANUAL CHASSIS : LD84K MODEL : M2794DP M2794DP-PZL CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL49414512 (0904-REV00) Printed in Korea...
Page 2: Table Of Contents
SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............15 DISASSEMBLY ..................19 TROUBLE SHOOTING ................20 BLOCK DIAGRAM...................28 EXPLODED VIEW .................. 30 SVC. SHEET ....................2009 Copyright LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...
Page 3: Product Safety
CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. 2009 Copyright LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. 2009 Copyright LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
Page 6: Specification
BOM . 2.5 The receiver must be operated for about 5 minutes prior to the adjustment. 4. General Specification 4.1 M2794DP-PZL : LGD LM270WF1- TLB1( P/N : EAJ60134107) Item Specification Unit Remark...
Page 7 Earphone (1EA) Antenna, AV1, AV2, AV3, Component, RGB, DVI, HDMI1, HDMI2 USB (1EA) Picture, Music For service only RS-232C (1EA) 2009 Copyright LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
Page 8 Humidity : 20 % ~ 80 % Storage Environment Temp : -10°C~60°C non condensing Humidity : 5 % ~ 90 % non condensing 2009 Copyright LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
Page 9 C: Interval between top of active area and bezel D: Interval between bottom of active area and bezel Active Area Bezel 2009 Copyright LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
Page 10 Component Video Input Level (Y, C B /P B , C R /P R ) R/ G/ B Video Input Level, 2009 Copyright LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
Page 11: X400
65.290 59.954 146.25 1600X1200 75.0 60.0 162.0 1920X1080 66.587 59.934 138.5 10.2 EDID Data (Product ID:22274) ** *** **** 2009 Copyright LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
Page 12 65.290 59.954 146.25 1600X1200 75.0 60.0 162.0 1920X1080 66.587 59.934 138.5 11.2 EDID Data (Product ID:22275) ** *** **** 2009 Copyright LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
Page 13: X480
12.2 EDID Data ; HDMI1/2 (Product ID:22276) ** **** ***** ***** : Physical address. (HDMI1: 10, HDMI2: 20/ **(Week), ***(Year), ****(Check Sum): Adjustable Data Copyright LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
Page 14 Stand Tilt Degree -5~10 degree Assy Tilt force 1.0~3.7 kgf Swivel Degree 358 degree Swivel Force 0.5~ 2 kgf 2009 Copyright LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
Page 15: Adjustment Instruction
If display "Can’t ", Check connect computer, jig, and set. Please Check the Speed : To use speed between from 200KHz to 400KHz 2009 Copyright LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
Page 16 · Select “Start” and press navigation key(¢∫). · ADC Calibration Internal is executed automatically. · Press EXIT key on R/C 2009 Copyright LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
Page 17 6. HDMI 7. PC Audio In Luminance * Display and Sound check is executed by Remote controller. Model Module M2794DP-PZL 2009 Copyright LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
Page 18 Confirm whether is normal or not when between power board's ac block and GND is impacked on 1.5kV(dc) or 2.2kV(dc) for one second 2009 Copyright LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
Page 19: Disassembly
Disassemble Back cover by lifting up the top lightly. Disassemble the side of Cabinet Assy * Caution! Hands off from the latch in the bottom 2009 Copyright LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
Page 20: Troubleshooting
Voltage Level 3.3V Check X101 Clock Replace X 101 12MHz Replace IC 105 Flash Memory Wave form of X101 2009 Copyright LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
Page 21 Check L VDS Cable for damage or ope n Replace Ca ble con ductors . Check L CD Module Control board (Refer to Module CAS) 2009 Copyright LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
Page 22 #3, #4, #15, #16 Check L CD Module Control board Refer to Mo dule CAS Wave form of X500 2009 Copyright LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
Page 23 Wave form of Comp Pb Wave form of Comp Pr Wave form of C115 Wave form of C117 Wave form of C119 2009 Copyright LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
Page 24 Wave form of R730(Vsync) Wave form of R729(Hsync) Wave form of R164/C121 Wave form of R144/C122 Wave form of R145/C123 2009 Copyright LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
Page 25 C131, C132, C133 C137, C134, C135 IC100 has problem Wave form of R771(CVBS) Wave form of R772(S-video) Wave form of R768(S-video) 2009 Copyright LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
Page 26 Check HD CP Key NVRAM (IC102) Replace IC102 Power & I2 C Sig nal (#5, #6) Replace Ms tar (IC100) 2009 Copyright LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
Page 27 Replace IC 1000 L104, L105, L106, L107 Check Sig nal from IC101 Replace IC 100 (R1008, R1009, R179, R180) 2009 Copyright LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
Page 28: Block Diagram
BLOCK DIAGRAM PCM_DATA PCM_CD_ON TS_Parallel TS_Serial PCM_ADD Composit e Composit e SCART SCART Component Component Video Video 2009 Copyright LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
Page 30: Exploded View
X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. 2009 Copyright LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
Page 42 Feb., 2009 P/NO : MFL49414512 Printed in Korea...

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