LG W1943SB Service Manual Download Page 18 | Manualshive

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LG W1943SB Service Manual Download Page 18

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TROUBLESHOOTING GUIDE

No Power

(Power Indicator Off)

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

Measure C707 (+)
=1.8V
U701 PIN2=3.3V

Check the Adapter/Inverter
section

Check CN404 or replace
C707, and U701

1. NO POWER

Check X401 oscillate
waveforms are normal

Replace U401

YES

http://www.wjel.net

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Summary of Contents for W1943SB

Page 1: ...COLOR MONITOR SERVICE MANUAL MODEL W1943SB W1943SB PFT A NAPH for LGD TLC1 W1943SB PFT A VAPH for AUO V00 Sales Market CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL To apply the Novatek Chip h t t p w w w w j e l n e t ...

Page 2: ...5 Typ Bottom 70 min 85 Typ 2 2 Luminance 250Cd m2 min 300Cd m2 Typ 6500K 170Cd m2 min 9300K 2 3 Contrast Ratio 600 min 1000 Typ 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Sync On Green 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 Vp p 3 Input impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog ...

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Page 7: ... 75 500 480 1 3 16 640 x 480 H Pixels 37 879 1056 800 40 128 88 4 V Lines 40 0 60 317 628 600 1 4 23 800 x 600 H Pixels 46 875 1056 800 16 80 160 5 V Lines 49 5 75 0 625 600 1 3 21 800 x 600 H Pixels 49 725 1152 832 32 64 224 6 V Lines 57 283 74 55 667 624 1 3 39 832 x 624 H Pixels 48 363 1344 1024 24 136 160 7 V Lines 65 0 60 0 806 768 3 6 29 1024 x 768 H Pixels 60 123 1312 1024 16 96 176 8 V Lin...

Page 8: ... on a soft flat 2 Revolve the release button 3 Consequently pull the base directly 4 The base 5 Put the front cover upward Then let the all latches are separated 6 Put the front face down disassembly back cover h t t p w w w w j e l n e t ...

Page 9: ... 9 7 Pull the key board out of bezel 8 Disassembly the bezel 9 Disassembly the LVDS cable 10 Disassemble the connector 11 Main board and power board 12 The panel h t t p w w w w j e l n e t ...

Page 10: ... 10 13 Rear cover and hinge ASS Y 14 Disassemble the rear cover and hinge ASS Y 15 Disassemble the hinge and stand 16 Hinge top hinge and stand h t t p w w w w j e l n e t ...

Page 11: ... 11 BLOCK DIAGRAM h t t p w w w w j e l n e t ...

Page 12: ...rcuit PWM control IC MOSFER OVP protect circuit Diode rectifier Starting resistor 14 5V Rush prevention ON OFF DIM Push pull circuit Transformer conversion LC resonance VDDA ON OFF circuit PWM IC OZ9938GN Feedback circuit OVP circuit 2 CCFL lamps Sampling Lamp open protection DIM circuit 14 5V 5V 100 240V h t t p w w w w j e l n e t ...

Page 13: ...n 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 5V is provided for LCD panel Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter converts from DC 14 5V to AC 700Vrms and opera...

Page 14: ...ary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized and also the over power protection is also monitor by this part 5 Photo Coupler isolation This part function i...

Page 15: ...he signal line of monitor with DDC recorder 2 Choose the DDC RECORD program and it shows on the screen the choose the correct source base on the monitor 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 o...

Page 16: ...heck sum It must be the same as the last byte of data table as follows picture shows Above of all must be right then if it shows the green PASS it means record succeeds the red Fail means record fails then check the power supply and signal line and ensure they are connected well then do DDC record again from the third step Fig 2 h t t p w w w w j e l n e t ...

Page 17: ...y sets the gain and offset value c AGING Select Aging mode on off d PANEL used panel type 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 Figure 1 Cable Con...

Page 18: ...nd make sure the AC of 100 240v is normal Measure C707 1 8V U701 PIN2 3 3V Check the Adapter Inverter section Check CN404 or replace C707 and U701 NO NO YES YES 1 NO POWER Check X401 oscillate waveforms are normal Replace X401 Replace U401 NO YES h t t p w w w w j e l n e t ...

Page 19: ...aster OSD Is Not Displayed Check U701 PIN 2 3 3V Check CN404 PIN 6 PIN7 5V Check power board and find out a short point as penning each power line 1 Check U701 2 Check C702 Check C707 1 8V NO NO NO YES YES YES Check CN404 PIN 6 PIN7 5V NO Check BL ON OFF pulse as contacting scope h t t p w w w w j e l n e t ...

Page 20: ...2 2 Check X401 3 TROUBLE IN SCALER IC SCALER PIN 63 64 OSCILLATES AS 12MHZ No Raster OSD Is Not Displayed CHECK CONNECTION LINE FROM D SUB TO SCALER TROUBLE IN CABLE OR LCD MODULE NO YES YES NO SCALER IC PIN 14 H SYNC PIN 15 V SYNC h t t p w w w w j e l n e t ...

Page 21: ... 21 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 h t t p w w w w j e l n e t ...

Page 22: ...k D902 C911 NO YES Check start voltage for the pin1 of U901 Check D901 R903 R904 R905 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 Check U901 PIN5 output is PWM Check D904 Q901 NO h t t p w w w w j e l n e t ...

Page 23: ...e IC801 NO Check Q806 pin5 pin6 is 14 5V Cut all the pin connector of Q806 check C811 14 5V CheckIC801 pin 2 5V Check C807 C809 C810 Check IC801 pin 5 pin6 NO Raster Lamp Off Check C811 14 5V Check ON OFF signal Check power section Check Interface section or main board NO NO NO YES YES Check IC801 Pin1 pin15 have the output of sawtooth YES NO YES NO YES NO h t t p w w w w j e l n e t ...

Page 24: ... 24 WIRING DIAGRAM 095G820H 6D515 095G8018 3XH55 095G 825 9W524 h t t p w w w w j e l n e t ...

Page 25: ... 25 EXPLODED VIEW h t t p w w w w j e l n e t ...

Page 26: ... M185XW01 V00 SZ AUO 756GQ8CB KL008 MAIN BOARD CBPCRNFLGQ1 040 756GQ8CB KL009 MAIN BOARD CBPCRNFLGQ1 050 PWPC8921MYE1 POWER BOARD Q15G0414201 MAINFRAME 060 Q15G0414401 MAINFRAME 705GQ934027 REAR COVER HINGE ASS Y 070 705GQ934029 REAR COVER HINGE ASS Y 080 705GQ9CS015 BASE ASSY 090 095G8018 3XH55 LVDS CABLE 100 089G 728HAA 2G SIGNAL CABLE 110 089G421A18N IS POWER CORD h t t p w w w w j e l n e t ...

Page 27: ...065G040210412T CHIP 0 1UF 16V X7R C407 065G040210412T CHIP 0 1UF 16V X7R C408 065G0402224 17 CAP CER 0 22UF 20 80 C409 065G040210412T CHIP 0 1UF 16V X7R C410 065G040210412T CHIP 0 1UF 16V X7R C411 065G0402270 31 0402 27PF J 50V NPO C412 065G0402270 31 0402 27PF J 50V NPO C413 065G040210412T CHIP 0 1UF 16V X7R C416 065G040210412T CHIP 0 1UF 16V X7R C417 065G040210412T CHIP 0 1UF 16V X7R C419 065G04...

Page 28: ...16 IC LD1117DT33TR DPAK TRANSISTOR Q404 057G 417 12 T KEC 2N3904S RTK PS Q405 057G 763 1 A03401 SOT23 BY AOS A1 Q406 057G 417 12 T KEC 2N3904S RTK PS Q408 057G 417 13 T KEC 2N3906S RTK PS RESISTOR R101 061G0603000 RST CHIP MAX 0R05 1 10W R102 061G0402101 RST CHIPR 100 OHM 5 1 16W R103 061G0402101 RST CHIPR 100 OHM 5 1 16W R104 061G0402101 RST CHIPR 100 OHM 5 1 16W R105 061G0402222 RST CHIPR 2 2 KO...

Page 29: ...01 RST CHIPR 100 OHM 5 1 16W R451 061G0402101 RST CHIPR 100 OHM 5 1 16W R452 061G0402101 RST CHIPR 100 OHM 5 1 16W R462 061G0402105 RST CHIPR 1MOHM 5 1 16W R468 061G0402222 RST CHIPR 2 2 KOHM 5 1 16W R469 061G0603101 RST CHIPR 100 OHM 5 1 10W R470 061G0402000 RST CHIP MAX 0R05 1 16W R471 061G0402103 RST CHIPR 10 KOHM 5 1 16W R473 061G0402102 RST CHIPR 1 KOHM 5 1 16W R474 061G0402102 RST CHIPR 1 KO...

Page 30: ...065G060347141J Y CAP CHIP 0603 470PF J 100V NPO C837 065G0805391 31 CHIP 390PF 50V C838 065G0805473 32 CHIP 0 047UF 50V X7R C839 065G 3J3096ET 3PF J 3KV Z5P C841 065G0805392 31 CHIP 3900PF 50V X7R 0805 C900 065G306M3322BP 3300PF 20 C901 065G306M1022BP 1000PF Y1 CAP C902 065G306M1022BP 1000PF Y1 CAP C903 063G107K474 US 0 47UF 10 C903 006G 31502 1 5MM RIVET C905 067G215S10915T L LOW ESR EC 1UF 450V ...

Page 31: ...20FI LS Q901 057G 667 56 MOSFET 7A 650V FMA07N65GX TO 220F Q901 057G 724 11 STP9NK65ZFP Q901 006G 31502 1 5MM RIVET Q902 057G 761 16 TRA KTD1028 KEC U901 056G 379111 IC LD7577 GS SOP 8 U902 056G 139 3A IC PC123Y22FZ0F U903 056G 158 12 KIA431A AT P TO 92 RESISTOR NR901 061G 5810T RST NTCR 8 OHM 20 4A 13MM THINKING NR901 006G 31502 1 5MM RIVET R807 061G1206220 RST CHIPR 22 OHM 5 1 4W R808 061G080547...

Page 32: ...100 OHM 5 1 4W R916 061G1206101 RST CHIPR 100 OHM 5 1 4W R917 061G1206101 RST CHIPR 100 OHM 5 1 4W R918 061G1206101 RST CHIPR 100 OHM 5 1 4W R919 061G1206101 RST CHIPR 100 OHM 5 1 4W R920 061G1206101 RST CHIPR 100 OHM 5 1 4W R921 061G0805151 RST CHIPR 150 OHM 5 1 8W R922 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R923 061G0603100 1F RST CHIPR 1 KOHM 1 1 10W R924 061G152M10152T RST MOFR 100OHM 5 2WS F...

Page 33: ...0 23 JUMPER WIRE J804 095G 90 23 JUMPER WIRE J805 095G 90 23 JUMPER WIRE J806 095G 90 23 JUMPER WIRE J901 095G 90 23 JUMPER WIRE J902 095G 90 23 JUMPER WIRE J903 095G 90 23 JUMPER WIRE J904 095G 90 23 JUMPER WIRE J905 095G 90 23 JUMPER WIRE J906 095G 90 23 JUMPER WIRE J907 095G 90 23 JUMPER WIRE J908 095G 90 23 JUMPER WIRE L901 073G 174 65 H2 LINE FILTER 30MH MIN L901 006G 31502 1 5MM RIVET L903 0...

Page 34: ...Location Part No for TPV Description 705GQ934029 REAR COVER HINGE ASS Y Q34G0573 B6 4K0100 REAR COVER L185W 9LG 750GLU185X1012N000 PANEL M185XW01 V00 SZ AUO 756GQ8CB KL009 MAIN BOARD CBPCRNFLGQ1 SMTCR U402 100GKNA8000N11 MCU ASS Y 056G1133 81 Q15G0414401 MAINFRAME h t t p w w w w j e l n e t ...

Page 35: ...6M HSIN T7P T6P 2 INPUT INPUT DDC_SCL DDC_SDA HSIN VSIN VGA_DET BIN BIN GIN GIN RIN RIN SOGI DDC_WP 5V TCLK1P T4M DDC_SCL VCC3 3 T0M T1M T3P GIN 3 SCALER SCALER T0M T0P T1P T1M T2M T2P T3P T3M T4M T4P T5P T5M T6M T6P T7P T7M TCLK1M TCLK1P BL_ADJ Volume Mute Panel_ID PANEL_EN BL_ON VSIN HSIN RIN RIN GIN GIN SOGI BIN BIN DDC_SDA DDC_SCL VGA_DET VCC3 3 5V VCC1 8 DDC_WP Panel_ID SOGI VCC3 3 RIN RIN VC...

Page 36: ...SDA RIN 5 VGA_R H_Sy nc U101 NC AT24C02BN SH T 1 2 3 4 5 6 7 8 A0 A1 A2 VSS SDA SCL WP VCC VGA_R R111 100R 1 16W 5 R121 4K7 1 16W 5 R101 0R05 1 10W 5 C119 5PF50V GIN 5 R104 100R 1 16W 5 H_Sy nc ESD_5V C101 0 047uF VGA_G U102 AZC199 04S 1 2 3 4 5 6 I O1 GND I O2 I O3 VDD I O4 C113 0 047uF C117 5PF50V VGA_G DDC_SCL 5 Inte edid f or LG only BIN 5 VGA_G VGA_PLUG R115 100R 1 16W 5 C105 0 047uF U101 NC ...

Page 37: ... R411 SPI_CE MSCL U402 SST25LF020A 33 4C SAE 1 2 3 4 5 6 7 8 CE SO WP VSS SI SCK HOLD VDD C431 0 1UF 16V LEDB CVDD_1 8 CN407 CONN 1 2 3 4 5 6 7 VGA_DET 4 DDC_WP 4 MSCL DDC_SCL 4 SPI_SO LEDB C451 10UF6 3V R454 NC 4K7 1 16W 5 T5P 6 key 4 R428 3 9K OHM 1 16W C439 2 2uF 10V C401 0 1UF 16V CN408 NC CONN 1 2 3 4 5 6 7 5V SPI_CK MSDA C410 0 1UF 16V U401 NT68167FG D 18 11 13 4 5 6 7 8 9 10 17 16 14 15 1 2...

Page 38: ...P R421 220 OHM 1 4W R1206 T6M T3P 5 T3P R436 56K 1 16W 5 R420 10K 1 16W 5 T6P T6P 5 T4P T4M TCLK1P T2P R433 10K 1 16W 5 T2P 5 1 T2P T3M C441 0 1UF 16V T7P T5P C420 0 1UF 16V FB408 120 OHM T0P 5 C421 1uF 16V D T7M R435 22K 1 16W 5 Q405 AO3401 CN405 CONN 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 PANEL_VCC T7M TCLK1P T3P TCLK1M T5M T5M 5 T4P T0M 5 G T0P T7M 5 TC...

Page 39: ... 16W 5 Mute TO252 R705 100R 1 16W 5 5VCC BKLT VBRI BL_ADJ 5 C706 0 1UF 16V VCC1 8 5 Mute C711 NC 4 7uF 16V C704 100uF 16V Q406 2N3904S RTK PS Ext 1 8V TO252 VCC3 3 5V 4 5 6 R709 10K 1 16W 5 U703 NC 1 2 3 ADJ GND VOUT VIN R712 NC BKLT EN C702 100uF 16V C_PANEL_INDEX 5V U702 NC AME8810 AEGTZ 0 6A 3 3V 1 2 3 4 GND VOUT heat sink VIN 4 R706 NC 4K7 1 16W 5 SOT223 C707 100uF 16V C709 0 1UF 16V CN404 CON...

Page 40: ...F 65G1206104 32 GND C919 1000UF16V C905 1uF 450V 67G215S10915T L R908 20K OHM 1 4W J903 JUMPER 1 2 L903 1 1uH R921 150R 1 8W 5 R922 1K 1 10W 1 DIM R912 10K 1 10W 1 R905 3 3M OHM 1 14W 61G1206335 C918 1000UF16V L901 30mH 1 4 2 3 5V C908 0 01uF R928 3 65K OHM 1 1 10W CN902 Wire Harness 1 2 3 4 5 6 7 8 9 R915 100 OHM 1 4W R920 100 OHM 1 4W R926 1K 1 10W 1 F901 FUSE R919 100 OHM 1 4W ON OFF R929 43 2K...

Page 41: ...VSEN OVPT NC1 NC2 ENA LCT SSTCMP CT GNDA DRV2 PGND R841 61G0805487 0F 487 OHM 1 1 8W CN803 NC 1 2 R816 1M 1 8W 5 61G0805105 SST D802 93G 64 33 BAV99 3 1 2 Q812 RK7002 C807 0 01uF 65G0805103 32 R810 1M 1 8W 5 61G0805105 D806 BAV99 93G 64 33 3 1 2 C811 470UF25V 67T215P4714AV C805 2200pF50V 65G0805222 31 R842 22R 1 4W 5 61G1206220 C814 1uF 25V ON OFF C834 470PF100V 65G060347141J Y C825 12PF6KV 65G 6J...

Page 42: ... 42 Mar 2009 P NO Printed in China h t t p w w w w j e l n e t ...

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