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LG E1941S Service Manual Download Page 19

 

Copyright © 2011 LG Electronics. Inc. All right reserved.   - 19 -                        LGE Internal Use Only 
Only for training and service purposes 

TROUBLESHOOTING GUIDE 

 

 

 

 

 
 
 
 
 
 
 
 
 

No Power 

(Power Indicator Off) 

Please reinsert and 
make sure the AC of 
100-240V is normal 

Measure U701 PIN2 
 =3.3V  

 

Check the Adapter/Inverter 
section 

Check CN404 or replace 
U701 

NO 

NO 

YES 

YES 

1. NO POWER

 

Check X401 oscillate 
waveforms are normal 

Replace X401 

 

Replace U401 

 

NO 

YES 

Summary of Contents for E1941S

Page 1: ...ic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com COLOR MONITOR SERVICE MANUAL MODEL E1941S E1941S BNT A TOV for AUO M185XW01 VD0A E1941S BNT A NOV for LGD LM185WH2 TLA1 Sales Market CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL To apply the Novatek Chip Internal Use Only ...

Page 2: ... missive mode Normally White 2 OPTICAL CHARACTERISTICS 2 1 V Viewing Angle by Contrast Ratio 5 Left Right 150 Min 176 Typ Top Bottom 140 Min 170 Typ 2 2 Luminance 200 Min 250 Typ Warm 150 Min Cool 2 3 Contrast Ratio 600 min 1000 Typ 3 SIGNAL Refer to the Timing Chart 3 1 Video Input Signal 1 Type R G B Analog Digital 2 Voltage Level 0 7 Vp p 3 Input impedance 75 Ω 3 2 Operating Frequency Horizonta...

Page 3: ...Copyright 2011 LG Electronics Inc All right reserved 3 LGE Internal Use Only Only for training and service purposes ...

Page 4: ...Copyright 2011 LG Electronics Inc All right reserved 4 LGE Internal Use Only Only for training and service purposes ...

Page 5: ...Copyright 2011 LG Electronics Inc All right reserved 5 LGE Internal Use Only Only for training and service purposes ...

Page 6: ...Copyright 2011 LG Electronics Inc All right reserved 6 LGE Internal Use Only Only for training and service purposes ...

Page 7: ...s 59 94 525 480 10 2 33 3 H Pixels 31 5 37 5 840 640 16 64 120 640 x 480 V Lines 75 500 480 1 3 16 4 H Pixels 40 0 37 879 1056 800 40 128 88 800 x 600 V Lines 60 317 628 600 1 4 23 5 H Pixels 49 5 46 875 1056 800 16 80 160 800 x 600 V Lines 75 0 625 600 1 3 21 6 H Pixels 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 7 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V...

Page 8: ...rnal Use Only Only for training and service purposes DISASSEMBLY Set 1 Put the monitor on a soft flat 2 Unscrew the 1 screw to pull out the base 3 The base 4 Give the stand a hard pull 5 Use hands to open all latches 6 Put the front face down disassembly back cover ...

Page 9: ...rposes 7 Pull the key board out of bezel 8 Disassembly the FFC cable 9 Tear up the tapes to remove the MAIN_FRAME 10 Turn over the MAIN_FRAME and disconnect the key board cable 11 Unscrew the screws DVI just for E1941T 12 Unscrew the screws on power board 13 Unscrew the screw on main board 14 Remove the bezel ...

Page 10: ...1 LG Electronics Inc All right reserved 10 LGE Internal Use Only Only for training and service purposes 15 The panel 16 Rear cover and BRACKET 17 Stand and hinge 18 Disassemble the stand and hinge 19 Hinge and stand ...

Page 11: ...and service purposes BLOCK DIAGRAM Main board U401 DDC DSUB PORT SCALAR NT68168AFG DSUB CN101 Crystal X401 12MHZ CN407 to Keyboard A D input control RGB H V SYN SCL SDA WP Serial Flash U402 To Power Block Brightness control CN405 to Panel LVDS output Panel Power sequence control circuit Block Q405 ...

Page 12: ...erter Board DIM ENA Feedback Circuit Transformer ZD801 MOSFET Q801 PWM Control TA9690GN IC801 12V 16V transfer to 5V for IC801 Inverter Connector CN803 Photo coupler U902 EMI filter H V Start R908 R911 PWM Control LD7576AGR U901 Transformer T901 AC input 14 5V 5V Bridge Rectifier and Filter Rectifier diodes Power Switch Q901 Regulator Current limit feedback ...

Page 13: ...tion LED bar ON OFF circuit Current balance Control IC OZ9998BGN Feedback circuit OVP circuit Current Feedback DIM circuit 14 5V ON OFF DIM Photo coupler U902 EMI filter H V Start R908 R911 PWM Control LD7576AGR U901 Transformer T901 AC input 14 5V 5V Bridge Rectifier and Filter Rectifier diodes Power Switch Q901 Regulator Current limit feedback ...

Page 14: ... the video signal converted analog to digital interpolates input to 1366 x 768 resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power which is provided 5V in Power board 14 5V is provided for inverter board 5V is provided for LCD panel Also 5V is converted 3 3V and 1 8V by regulator Converted power is...

Page 15: ...in board provides ENA signal to make the converter system On or Off 3 DIM circuit Main board provides PWM signal to make the light LED On or Off 4 IC TA9690GN Converter controls IC the function provide PWM driver signal to Boost converter balance the LED current set the maximum output voltage of OVP 5 OVP circuit set the maximum output voltage of OVP through this voltage IC can neglect the OPEN s ...

Page 16: ...nitor 3 Click LoadFile then key in the manufacturer name model name product code then choose the correct model name base on the monitor as Fig 2 4 Scan serial No to DDC recorder by Bar Reader then read again in the Verify SN 5 According to the message of DDC program when the picture as fig 1 appears it show DDC record has finished Fig 1 Please check Manufacturer Name Vendor Assigned Code Monitor N...

Page 17: ...Copyright 2011 LG Electronics Inc All right reserved 17 LGE Internal Use Only Only for training and service purposes Fig 2 ...

Page 18: ... as described below a CLEAA ETI NO b Auto Color NO c AGING OFF d PANEL AUO240 1080 e NVRAM INIT NO f R G B 9300K Allows you to set the R G B 9300K value manually g R G B 6500K Allows you to set the R G B 6500K value manually h R G B Offset Allows you to set the R G B Offset value manually Analog Only i R G B Gain Allows you to set the R G B Gain value manually Analog Only e R G B sRGB Allows you t...

Page 19: ...ce purposes TROUBLESHOOTING GUIDE No Power Power Indicator Off Please reinsert and make sure the AC of 100 240V is normal Measure U701 PIN2 3 3V Check the Adapter Inverter section Check CN404 or replace U701 NO NO YES YES 1 NO POWER Check X401 oscillate waveforms are normal Replace X401 Replace U401 NO YES ...

Page 20: ...poses 2 NO RASTER OSD IS NOT DISPLAY LIPS LIPS YES YES YES Check CN404 PIN 6 5V NO Check BL ON OFF pulse as contacting scope No Raster OSD Is Not Displayed Check U701 PIN 2 3 3V Check CN404 PIN 6 5V Check power board and find out a short point as penning each power line 1 Check U701 2 Check C701 C702 C703 NO NO ...

Page 21: ...service purposes 3 NO RASTER OSD IS NOT DISPLAY MSTAR 2 Check C411 C412 3 Check X401 4 Trouble in Scalar IC Scalar pin 63 64 oscillates as 12MHz No Raster OSD Is Not Displayed Check connection line from D SUB to Scalar Trouble in cable or LCD module NO YES YES NO Scalar IC pin 14 H Sync pin 15 V Sync ...

Page 22: ...ctronics Inc All right reserved 22 LGE Internal Use Only Only for training and service purposes 4 TROUBLE IN DPM Trouble in DPM Scaler IC pin 14 H Sync pin 15 V Sync Check H V sync line Trouble in cable or LCD module NO YES ...

Page 23: ...k U901 T901 D901 D906 ZD901 Q904 U902 U903 Check U901 pin 6 Vcc is 30V Check D904 C913 NO YES Check U901 PIN5 output is PWM Check D907 Q901 NO Check start voltage for the pin8 of U901 Check R908 R911 U901 YES NO YES No Power Power Indicator Off Check AC line volt Check the voltage of C907 Check AC line Check F901 BD901 NO YES NO ...

Page 24: ...for training and service purposes LGD PANEL 6 RASTER Check U801 pin 19 volt Check R814 R832 Check Q801 NO Raster No picture Check R832 12V Check ENA signal Check power section Check Interface section or main board NO NO NO YES YES Check CN803 Pin 5 6 51 2V YES NO Check Panel connecter ...

Page 25: ...and service purposes AUO PANEL Check U801 pin 9 volt Check R801 FB801 Check U801 NO Raster No picture Check C801 14 5V Check ON OFF signal Check power section Check Interface section or main board NO NO NO YES YES Check U801 pin 8 volt YES NO Check CN804 Pin 3 4 5V Check Panel connecter Check Q801 ...

Page 26: ...Copyright 2011 LG Electronics Inc All right reserved 26 LGE Internal Use Only Only for training and service purposes WIRING DIAGRAM 095G176W 10V08 095G 825 9WE04 095G8014 7W621 S95G80183H92 ...

Page 27: ...010 020 130 140 100 050 060 070 080 040 120 030 090 ...

Page 28: ...3M 2 INPUT INPUT DDC_SCL DDC_SDA HSIN VSIN VGA_DET BIN BIN GIN GIN RIN RIN SOGI DDC_WP 5V T4M 5 POWER POWER Panel_ID Mute BL_ADJ BL_ON Volume 5V VCC3 3 VCC1 8 T5P 4 PANEL INTERFACE PANEL INTERFACE PANEL_EN T0M T0P T1M T1P T2M T2P T3M T3P T4P T4M T5M T5P T6M T6P TCLK1M TCLK1P T7M T7P T1M GIN TCLK1M 5V T2P T1P BIN VGA_DET T6P PANEL_EN RIN Panel_ID BIN BL_ADJ Mute SOGI E A 1 5 Tuesday Nov ember 23 20...

Page 29: ...103 VGA_G DSUB_5V FB102 BEAD 1 2 5V 5 6 7 C113 47N16V VGA_R C109 47N16V C114 NC R102 100OHM1 16W RIN 5 SOGI 5 VGA_R C105 47N16V R122 0R01 1 16W DSUB_SDA R114 100OHM1 16W ESD_5V DSUB_5V ESD_5V VGA_G VGA_R C117 5PF 50V DSUB_SDA H_Sy nc C110 47N16V R111 100OHM1 16W R120 4 7K 1 16W DDC_SCL R104 100OHM1 16W U102 AOZ8902CIL 1 2 3 4 5 6 CH1 VN CH2 CH3 VP CH4 C107 47N16V R113 100OHM1 16W H_Sy nc VGA_PLUG ...

Page 30: ...CLK SPI_SI SPI_SO SPI_CE OSCO OSCI SPI_SI R453 NC 4K7 1 16W 5 R455 NC 10K 1 16W 5 R429 0R01 1 16W T5M 6 RIN 4 MSCL DVDD R407 3 9K1 16W GND C450 NC R466 NC 470R 1 16W 5 R465 NC 4K3 OHM 1 16W 5 DDC_WP 4 DVDD key 4 R427 3 9K1 16W SOGI 4 SPI_CE C410 100N16V CN406 NC CONN 1 2 3 4 5 6 CN402 NC CONN 1 2 3 4 5 6 C429 NC 0 22uF16V T2P 6 VCC3 3 7 VCC3 3 R403 NC 2K2 1 16W 5 R410 10K 5 1 16W FB409 NC BEAD 1 2...

Page 31: ...21 1UF16V T4P 5 T5M T6M T0M T1M T4M G T0M C449 100uF 16V TCLK1M 5 T6P C420 100N16V D T2P 5 2 5V R418 NC T6P 5 TCLK1P T3P C419 220N16V 1 PANEL_VCC T3M R421 220 OHM 1 4W R1206 TCLK1M T7M C441 100N16V Q405 AO3401 T5P R415 4 7K 1 16W T2M T0M 5 5V T2M 5 T2P CN403 NC CONN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 T6M 5 TCLK1M T5P R434 220 OHM 1 4W R1206 T4M TCLK1P ...

Page 32: ... Wednesday Nov ember 24 2010 G3225 1 2 5 POWER G3225 1 2 X 42 101119 OEM MODEL Size Rev Date Sheet of TPV MODEL PCB NAME 称爹 T P V Top Victory Electronics Co Ltd Key Component 絬 隔 瓜 絪 腹 C709 100N16V R705 100OHM1 16W C708 NC 1uF 10V 5VCC VCC3 3 5V 4 5 6 Mute C_PANEL_INDEX BKLT VBRI C711 NC 4 7uF 16V R709 10K 5 1 16W VCC3 3 R710 10K 5 1 16W 5VCC R712 NC R703 NC 100R 1 16W 5 R714 NC U703 NC AP2114D 1 ...

Page 33: ...4148 HS1 HEAT SINK Q901 1 2 R916 10KOHM 1 1 8W R907 1K OHM 5 1 8W D909 NC 31DQ06FC3 ADPCA1503QX5 1 Custom 1 1 Monday January 10 2011 715G4497 P0C 001 0010 ODM MODEL 01 POWER G4497 P0E 001 0010 2 110111 OEM MODEL Size Rev Date Sheet of TPV MODEL PCB NAME 称爹 T P V Top Victory Electronics Co Ltd Key Component 絬 隔 瓜 絪 腹 5V HS2 NC HEAT SINK D906_5V 4A 1 2 C922 470UF M 16V R924 0 47OHM2W ZD901 GDZJ22B 1...

Page 34: ... VREF GNDP VIN SEL COMP SSTCMP NC STATUS C805 0 47uF 16V C806 2U2 25V LNPCA8561LQBX 3 B 1 1 Saturday February 12 2011 715G4220 ODM MODEL 1 CONVERTER G4220 P01 OEM MODEL Size Rev Date Sheet of TPV MODEL PCB NAME 称爹 T P V Top Victory Electronics Co Ltd Key Component 絬 隔 瓜 絪 腹 R853 0R05OHM1 8W R804 20K 1 10W 1 12V R806 10K 1 10W 5 CN801 CONN 1 2 3 4 5 6 7 Vout C801 100N 50V OVP1 CN802 CONN 1 2 3 4 Vo...

Page 35: ...R919 220 OHM 1 8W R912 100 OHM 1 4W C907 100uF450V ADD C906 R913 1 OHM T901 POWER X FMR 1 3 4 5 6 7 8 9 10 11 12 Q904 KTD1028 эDIP 1 2W C929 2N2 500V C923 1nF 50V C914 1N 50V HS1 HEAT SINK Q901 1 2 C922 470UF M 16V C920 680uF 10V BD901 KBP208G 2 1 3 4 D907 1N4148 R935 NC C924 0 1uF 50V CN901 SOCKET 1 2 3 C911 1500PF2KV R920 2K 1 8W 5V R932 NC F901 FUSE D906 SRF1060 1 2 3 D902 NC R908 10K 1 4W C902...

Page 36: ... Electronics Co Ltd Key Component 絬 隔 瓜 絪 腹 14 5V R813 0 1R 1 CN801 NC CONN 1 2 3 4 5 R816 3 3K OHM R801 10K 1 8W C802 10N 50V R821 NC R815 100KOHM 5 1 8W C810 0 47UF 50V R811 0R05OHM1 8W CN803 NC CONN 1 2 FB801 BEAD 1 2 C814 100N 50V C803 1N 50V C805 2 2U16V R802 300K 1 8W FB802 BEAD 1 2 DIM CN802 NC CONN 1 2 R818 10K 1 8W C804 0 47UF 50V ON OFF C812 100PF 50V C806 220N 50V R804 10 OHM 1 8W C813 ...

Page 37: ...Copyright 2011 LG Electronics Inc All right reserved 38 LGE Internal Use Only Only for training and service purposes Feb 2011 P NO Printed in China ...

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