manualshive.com logo in svg

LG M2794D, Service Manual

Share
Download
LG M2794D Service Manual Download Page 16

Copyright ©2009 LG Electronics. Inc. All right reserved. 
Only for training and service purposes

LGE Internal Use Only

- 16 -

TROUBLESHOOTING

1. Power- Up Boot Fail Trouble Shooting

Check  P700 All

Voltage Level (5V, 15V)

Check Pow er con nector

OK ?

Replace Po wer 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

Wave form of X101

Summary of Contents for M2794D

Page 1: ...SSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA97A MODEL M2794D M2794D PMJ North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only P NO MFL49414529 0906 REV00 Printed in Korea ...

Page 2: ...t reserved Only for training and service purposes LGE Internal Use Only 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: ...d 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 path...

Page 4: ... 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 charge...

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: ...er must be operated for about 20 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 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 Analog Horizontal 30 83kHz Vertical 56 75 Hz Digital Horiz...

Page 7: ...ent 1 Temp 0 40 deg 2 Humidity 80 9 Storage Environment 1 Temp 20 60 deg 2 Humidity 85 4 2 TV No Item Content Unit Remark 1 Product Width W Length L Height H Dimension Before Packing 654 1 210 494 6 mm After Packing 725 535 185 mm 2 Product Only SET 8 92 Kg With BOX 11 1 Kg 3 Cintaniner 20ft 40ft Loding Individual or Indi Wooden Indi Wooden Quantity Palletizing 420 330 840 726 4 Stand Assy Type De...

Page 8: ... occurred Check gray linearity at standard mode Active area Active area of LCD PANEL is in bezel of cabinet Interval between active area and bezel A B 1 0 mm C D 1 0 mm A Interval between left of active area and bezel B Interval between right of active area and bezel C Interval between top of active area and bezel D Interval between bottom of active area and bezel C B D A Active Area Bezel No Item...

Page 9: ...e after 30 seconds No Item Min Typ Max Remark 1 M2794D PMJ 16000 1 20000 1 For Checking Black Luminance wait for over 1 minute 7 3 Dynamic CR Dynamic CR Working Condition Full Black Pattern All Black No pattern MSPG Pattern 2 signal in D sub DVI No Specification Remark Resolution H freq kHz V freq Hz 1 720 480 15 73 59 94 SDTV DVD 480I 2 720 480 15 73 60 00 SDTV DVD 480I 3 720 480 31 47 59 94 SDTV...

Page 10: ...17 40 0 5 800 600 46 875 75 0 49 5 6 1024 768 48 363 60 0 65 0 7 1024 768 60 123 75 029 78 75 8 1152 864 67 500 75 000 108 0 9 1280 1024 63 981 60 02 108 0 10 1280 1024 79 976 75 035 135 0 11 1680 1050 64 674 59 883 119 0 12 1680 1050 65 290 59 954 1 46 25 13 1600 1200 75 0 60 0 162 0 14 1920 1080 66 587 59 934 138 5 3 Adjustable Data Serial No Input the S N at Total Assembly line week year ex whe...

Page 11: ...1 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 1080 33 716 33 75 29 976 30 00 74 25 HDTV 1080P 9 1920 1080 56 250 50 148 5 HDTV 1080P 10 1920 1080 67 43 67 5 59 94 60 148 35 148 50...

Page 12: ...opyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 HDMI2 Adjustable Datas Serial No week Year and Check sum in HDMI EDID are same with RGB DVI ...

Page 13: ...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 COMMA...

Page 14: ...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 Input to RGB and connect D sub cable to set Measurement Condition 100 240V 50 60Hz Confirm DPM operation at the state of s...

Page 15: ...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 7F...

Page 16: ... 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 Wave form of X101 ...

Page 17: ...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 18: ... 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 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 18 3 Digital TV Video Trouble Shooting Wave form of X400 ...

Page 19: ...rouble 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 20: ...at 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 21: ...pu 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 22: ... 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 23: ...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 Spe...

Page 24: ...D 1 0Vp p 96dBuV 5V SIFM0 SIFP0 Buffer 1 2V 3 3V 3 16 15 N 11 P 10 2 IF_AGC MSCL MSDA 2 3 3V 1 2V 15V_AMP EEPROM EEPROM 512K 24C512 EEPROM 512K 24C512 3 3V Flash 8M Flash 8M 3 3V KEY_CTL 1 2 5V P O W E R P O W E R 15V 5V_ST INV_ON PWM_DIM A_DIM 12 SDA 7 SCL 8 TUNER_CVBS VCOM0 HDMI1 VIDEO USB SW Upgrade HPDCTRL 12 DDCDA_SDA 14 DDCDA_SCL 15 POWER_HDMI 110 3 3V AVDD_DVI 2 6V VDD_DDR 27 TMDS351 DVI HD...

Page 25: ...put 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 s...

Page 26: ...ical 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 SAFE...

Page 27: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 31: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 32: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 33: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 34: ...Copyright ⓒ 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 35: ......

Reviews:

No comments

Brands by name

Popular brands

Load more brands