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LG Flatron W1934S, Service Manual

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LG Flatron W1934S Service Manual Download Page 17

 

17

TROUBLESHOOTING GUIDE

 

 

1.

 No Power & Power LED Off 

 

 

 

 

No power 

Check primary 

rectifier voltage 

Check IC802, 

C805, T801 

Check circuit 

if short 

Check F801, P801, 

D801 

Check pin3 of 

IC802 voltage 

about 1V

Check R801, R805, 

R822, R823, R817 

Check pin2 of IC802 

voltage about 2V 

Check R803, R807, 

R824, R825 

Check pin1 of IC802 

Check R812, R816, 

C818 

END 

Summary of Contents for Flatron W1934S

Page 1: ...p html COLOR MONITOR SERVICE MANUAL CHASSIS NO MODEL W1934S W1934S SNI W1934S BNI Axx QP xx means sales region and module type AxxIQP INL 5ms AxxQQP CMO 5ms AxxYQP IVO 5ms CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL To apply the MSTAR Chip ...

Page 2: ...O M190A1 L07 panel Left 75 Right75 Top 70 Bottom 70 at Min CR 10 c For IVO M190MWW1 201 panel H 140 min 160 typ V 140 min 160 typ CR 10 2 2 Luminance a For InnoLux MT190AW01 V 5 panel 300cd m2 Typ 220cd m 2 Min 6500k 170 cd m 2 Min 9300k b For CMO M190A1 L07 panel 300cd m2 Typ 220cd m 2 Min 6500k 170 cd m 2 Min 9300k b For IVO M190MWW1 201 panel 300cd m2 Typ 220cd m2 Min 6500k 170 cd m2 Min 9300k ...

Page 3: ...rcuit must disconnect the AC adapter because high voltage appears at inverter circuit about 650Vrms Handle with care wires or connectors of the inverter circuit If the wires are pressed cause short and may burn or take fire Be careful while tilting and rotating the monitor to avoid pinching hand s Leakage Current Hot Check Circuit AC Volt meter Good Earth Ground such as WATER PIPE Protect the modu...

Page 4: ...t receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices c...

Page 5: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Page 6: ...nnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on th...

Page 7: ...1 4 23 800 x 600 H Pixels 46 875 1056 800 16 80 160 6 V Lines 49 5 75 0 625 600 1 3 21 800 x 600 H Pixels 49 725 1152 832 32 64 224 7 V Lines 57 283 74 55 667 624 1 3 39 832 x 624 H Pixels 48 363 1344 1024 24 136 160 8 V Lines 65 0 60 0 806 768 3 6 29 1024 x 768 H Pixels 60 123 1312 1024 16 96 176 9 V Lines 78 75 75 029 800 768 1 3 28 1024 x 768 H Pixels 68 681 1456 1152 32 128 144 10 V Lines 100 ...

Page 8: ...V Lines 59 90 926 900 3 6 17 H Pixels 55 935 1904 1440 80 152 232 15 V Lines 106 500 59 887 934 900 3 6 25 1440x 900 H Pixels 70 635 1936 1440 96 152 248 16 V Lines 136 750 74 984 942 900 3 6 33 1440x 900 ...

Page 9: ...9 DISASSEMBLY ...

Page 10: ...10 ...

Page 11: ...11 BLOCK DIAGRAM ...

Page 12: ... 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 14V is provided for inverter 14V is provided for LCD panel and 5V for micom 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 DC14V to AC 700Vrms and operates back ligh...

Page 13: ...to secondary 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 achive the dc output stablize and also the over power protection is also monitor by this part 5 Photo Coupler isolation This part func...

Page 14: ...xe c Writing data Mars W1934 2 Hardware a PC winXP win2000 or win98 1 pc b Writing tools Including EDID writing card connecting cable etc 3 EDID Writing Connection 4 EDID Writing SOP a Select File submenu select Auto Write Figure 1 Figure 2 Figure 3 ...

Page 15: ...15 b Select Model of main menu Password 1234 c Select written model W1934S d Input product serial number The SN is 12 numbers in S N Column then the program auto writing start ...

Page 16: ...ng mode on off e R G B 9300K Allows you to set the R G B 9300K value manually f R G B 6500K Allows you to set the R G B 6500K value manually g R G B Offset Allows you to set the R G B Offset value manually Analog Only h R G B Gain Allows you to set the R G B Gain value manually Analog Only i MODULE Show Current module Type j RS232 Enable Disable Debug Mode on off k SRGB Allows you to set the sRGB ...

Page 17: ...k primary rectifier voltage Check IC802 C805 T801 Check circuit if short Check F801 P801 D801 Check pin3of IC802voltage about 1V Check R801 R805 R822 R823 R817 Check pin2of IC802 voltageabout 2V Check R803 R807 R824 R825 Check pin1of IC802 CheckR812 R816 C818 END ...

Page 18: ...F board Yes R526 open No Yes Is there instantaneously pulse wave on pin1 pin3 pin15 of IC501 at the moment of restart No Is Ok IC501 Yes U501 U502 fail No IC501 fail Yes Is ok T501 T502 T501 T502 fail Are connected rightly CN501 CN502 CN503 and CN504 No Connecting the output connector No Yes Is there 5Vdc voltage on pin2 of IC501 Yes Yes Check feedback circuit Isen Vsen D503 D504 D501 D50 ...

Page 19: ...about 6V Check Vpin1 2 of IC801 about 1V Check C815 D806 R812 Check R809 R814 END Output Voltage Unstable Check Vbe of Q801 below 0 3V Check circuit if short Check ZD801 ZD802 ZD803 D803 D805 Check Q801 Q802 Check reference voltage Check Pin R of IC803 voltage about 2 5V Check R809 R814 IC801 R818 ...

Page 20: ...8 R814 D809 Check D806 C815 if short Change D806 C815 Check pin1 of IC802 voltage is 5 8V Check pin3 of IC802 voltage about 1V Change R801 R805 R822 R823 R817 END Check the C pin voltage of IC803 if 3V Change IC803 Unstable power Check sampling Circuit Check R810 R811 R818 Change R810 R811 ...

Page 21: ...f U105 Check CCFL Enable pin85 of U105 MCU Fail Check FB103 Check X101 C153 C154 Inverter Fail OK NG OK Check Reset pin84 Of U105 Check pin5 of CN101 Check R167 Q106 R108 R110 Check C144 R172 NG NG OK OK Check pin32 49 56 and 75 Of U105 And U102 Check FB106 And U101 NG NG NG OK OK OK NG 5 Black Screen and backlight turn on ...

Page 22: ...k VLCD Is 5V Check Panel Enable Of U105 pin48 is High Check R168 R105 Q103 Q101 END Workmanship LVDS Cable NG Panel Fail Check LVDS Signals Check the HW Reset Of U105 pin84 Check the pins Of U105 Check C144 R172 NG NG NG NG NG NG OK OK OK OK OK 6 White Screen ...

Page 23: ...nship LVDS Cable Reinsert Change LVDS Cable Check Crystal Pin96 97 Of U105 Check the communication Of U105 and U106 Check the pins of U105 and U106 LVDS Cable NG Check X101 C153 C154 Check SDO SCZ SCK SDI Reset NG OK OK NG OK OK OK NG ...

Page 24: ...24 WIRING DIAGRAM ...

Page 25: ...Exploded View and Parts List 050 070 080 090 100 110 120 130 020 030 040 060 010 ...

Page 26: ...K LE19B5 EE0 ROHS 60 MDQ47252401 502090309100R CHASSIS LE17B4 ACQ53969101 714050013200R ASSY BACK COVER LE19B5 6E0 70 ACQ53969102 714050013210R ASSY BACK COVER LE19B5 EE0 FOR IVO 80 ACQ52748101 714020012000R ASSY BASE LE19B5 90 MCK47213101 502020800110R STAND LE19B5 6410TUW008A 453070800150R PWR CORD 10A 125V BLK 6FT UL CSA SVT 3Cx US Mexico Panama Canada 6410TBW004A 453070800720R PWRCORD 10A 250V...

Page 27: ...3Cx US Mexico Panama Canada 1 20 6410TBW004A 453070800720R PWRCORD 10A 250V BLK 6FT UK H05VV F 3Cx0 UK Malaysia Singapore 1 20 6410TEW003A 453070800730R PWRCORD 16A 250V BLK 6FT VDE H05VV F 3Cx Europe Thailand Vietnam Russia U A E 1 20 6410TSW003A 453070800740R PWRCORD 10A 250V BLK 1850mm SAA H05W F 3 Australia 1 20 6410TTW001A 453070800750R PWRCORD 7A 125V BLK 1850mm CNS VCTF 3Gx0 Taiwan 1 20 15 ...

Page 28: ...20 4 EBU49007701 791271500000R PCBA KEYPAD BOARD LE19B5 6E0 ROHS 1 20 5 ACQ52748101 714020012000R ASSY BASE LE19B5 1 20 6 ABJ53968501 714030014200R ASSY BEZEL SILVER LE19B5 1 20 7 ABJ53968502 714030014201R ASSY BEZEL BLACK LE19B5 1 20 8 ACQ53969102 714050013210R ASSY BACK COVER LE19B5 EE0 FOR IVO 1 20 10 MDQ47252401 502090309100R CHASSIS LE17B4 1 20 11 MCK47213101 502020800110R STAND LE19B5 1 20 1...

Page 29: ... 410500046210R XSTR PMBT3906 PNP 200MA 40V SOT23 PHILIP 2 PC 150 Q101 410500068290R XSTR AP2305GN P CH SOT23 APEC RoHS 1 PC 160 Q107 410500050210R XSTR 2N7002 N CH FET SOT 23 PHILIPS RoH 1 PC 170 TVS101 TVS102 TVS103 TVS104 411020026210R DIO BAV99 350mW 70V SOT 23 PHI RoHS 4 PC 180 D103 411020047210R DIO BAV70 85V SOT23 PHILIPS RoHS 1 PC 190 ZD101 ZD105 ZD106 ZD107 ZD108 411100956920R ZENER 5 6V M...

Page 30: ... RoHS 1 PC 420 C125 419303300560R C SMD 0603 NPO 33PF 50V J RoHS 1 PC 430 C103 C104 C106 C107 C109 C129 C131 C132 C134 C135 C136 C137 C139 C141 C143 C147 C148 C149 C150 C151 C152 C156 C166 C146 419311040060R C SMD 0603 X7R 0 1uF 50V K RoHS 24 PC 440 C140 419311054070R C SMD 0805 X7R 1uF 16V K RoHS REV A 1 PC 450 C112 C113 C114 C115 C116 C117 C118 419314730060R C SMD 0603 X7R 0 047uF 50V K RoHS 7 P...

Page 31: ...10R XSTR 2N7002 N CH FET SOT 23 PHILIPS RoH 1 PC 170 TVS101 TVS102 TVS103 TVS104 411020026210R DIO BAV99 350mW 70V SOT 23 PHI RoHS 4 PC 180 D103 411020047210R DIO BAV70 85V SOT23 PHILIPS RoHS 1 PC 190 ZD101 ZD105 ZD106 ZD107 ZD108 411100956920R ZENER 5 6V MMSZ5232A SOD123 PE C RoHS 5 PC 200 U108 412000279480R IC AT24C04N 10SU 2 7 SOP8 4K A TMEL RoHS 1 PC 210 U102 412000330830R IC AS1117L 1 8 TR LF...

Page 32: ... C117 C118 419314730060R C SMD 0603 X7R 0 047uF 50V K RoHS 7 PC 460 FB101 432002312111R BEAD CORE SMD 0805 120Ω 300mA RoHS 1 PC 470 FB102 FB103 FB105 FB106 432002360012R BEAD CORE SMD 0805 60Ω 800mA GBK201209T 4 PC 480 CN104 444099030030R CON SMD 1 0mm 30PIN RoHS AL2309 A0G1Z 1 PC 490 506140005700R LABEL BARCODE BLANK 33x7mm ROHS FOR PCB 1 PC 500 491291300100R PCB I F BOARD LE19B5 XE0 ROHS 1 PC 51...

Page 33: ...L 1 8 TR LF SOT223 A1 SEMI RoHS 1 PC 220 U101 412000372830R IC AS1117L 3 3TR LF SOT223 A1S EMI RoHS 1 PC 230 U103 412000435480R IC AT24C02BN 10SU 1 8 SOIC8 2K ATMEL Ro 1 PC 240 U105 412000508190R IC TSUM16AL LF 1 PQFP100 MSTAR RoHS 1 PC 250 U106 412000373190R IC SST25VF010A 33 4C SAE SOIC 8 SST RoH 1 PC 260 R103 R190 414916000050R RES SMD 0603 0Ω J RT RoHS 2 PC 270 R186 R187 414916010050R RES SMD ...

Page 34: ...6Ω F RT RoHS REV A 3 PC 530 FB107 FB108 FB109 432002360140R BEAD CORE SMD 0603 60Ω 600mA GBK160808 3 PC 540 511130002203R SOLDER PASTE Sn96 5 Ag3 0 Cu0 5 SAC305 O 0 21 G 550 R101 414916033150R RES SMD 0603 330Ω J RT RoHS 1 PC Power and Inverter Board 1 FOR INL ITEM Location P N Description Usage Un 791271400600R PCBA P I BOARD W O SPK LE19B5 6E0 ROHS 10 IC801 412140002380R IC LTV817M PR VDE LITE O...

Page 35: ... 123 WILLAS ROHS 1 PC 370 ZD804 ZD805 411100916020R ZENER 16V MMSZ5246A SOD123 PEC RoHS 2 PC 380 R809 414904100010R RES SMD 1206 100Ω F RT RoHS 1 PC 390 R808 R819 R827 414908010350R RES SMD 0805 10KΩ J RT RoHS REV A 3 PC 400 R801 R805 R822 R823 414908033550R RES SMD 0805 3 3MΩ J RT RoHS 4 PC 410 R813 R814 R815 414908010250R RES SMD 0805 1KΩ J RT RoHS REV A 3 PC 420 R825 414908047450R RES SMD 0805 ...

Page 36: ...0R C SMD 0603 X7R 0 033uF 50V K ROHS 2 PC 820 511110001101R SEAL GLUE 3629 LOCTITE 0 09 G 830 R510 R531 414908340110R RES SMD 0805 3 4KΩ F RT RoHS REV A 2 PC 840 C514 C527 419313910070R C SMD 0805 X7R 390PF 50V K RoHS 2 PC 850 R804 415130680540R RES CF 1 2W 68Ω J AT RoHS REV A 1 PC 860 R828 415340101540R RES MOF 1W 100Ω J AT MINI RoHS 1 PC 870 D806 411030003040R DIO FR103 200V 1A DO 41 MOSPEC RoHS...

Page 37: ...24610R CAP MEY 4700pF 400V M Y F10mm RoHS 1 PC 80 L802 L803 425000010530R COIL CHK 5uH 7 8X10 CHK 053 0 181085R0L 2 PC 90 L801 426000050070R CHOKE L FILTER 12mH LIN 007 ET 20 RoHS 1 PC 100 T801 426000090510R XFMR 750u 1K 8 3m 113m SPW 051 DIP 1 1 PC 110 RT801 432009401300R NTC 8Ω 4A 13Φ P 7 5mm F ROHS 1 PC 120 F801 430613430290R FUSE SLOW 3 15 250 Axial Lead 3 6 x10mm 1 PC 130 P801 440149000220R S...

Page 38: ...10 414908510110R RES SMD 0805 5 1KΩ F RT RoHS 1 PC 520 R535 414916075150R RES SMD 0603 750Ω J RT RoHS 1 PC 530 C502 419342253670R C SMD 0805 Y5V 2 2uF 25V Z RoHS 1 PC 540 C821 419311040060R C SMD 0603 X7R 0 1uF 50V K RoHS 1 PC 550 C504 C505 C522 C529 419311020070R C SMD 0805 X7R 1000PF 50V K RoHS 4 PC 560 C510 C516 419311020060R C SMD 0603 X7R 1000PF 50V K RoHS 2 PC 570 C511 419314730060R C SMD 06...

Page 39: ...AT RoHS 7 5MM 105 96 MM 940 J501 J510 J801 J805 J806 J807 430405000000R JMPR ROLL KG D 0 6mm AT RoHS 10MM 120 96 MM 950 J505 J506 J511 J804 J808 430405000000R JMPR ROLL KG D 0 6mm AT RoHS 12 5MM 113 3 MM 960 J503 J502 J512 J809 J507 430405000000R JMPR ROLL KG D 0 6mm AT RoHS 15MM 125 8 MM 970 J509 J508 430405000000R JMPR ROLL KG D 0 6mm AT RoHS 20MM 60 32 MM 980 700000000700R ASSY PCB RIVENT LE19B...

Page 40: ...5 2 PC 200 H802 735100007120R ASSY H S SBR10U100CT U40CT LE1710 1 PC 210 H801 735100005900R ASSY H S TOP246Y LE1X09 ROHS 1 PC 220 H501 502040604500R SHIELD EMI LE1915 ROHS 1 PC 230 791271440600R PCBA P I BOARD SMT W O SPK LE19B5 6E0 RO 1 PC 240 511130001200R SOLDER BAR Sn96 5 Ag3 0 Cu0 5 Ni0 06 Ge0 4 6 G 250 511110000101R HOT MELT ADHESIVES 526 1 338 G 260 511110000501R SILICONE RTV RUBBER UB 511 ...

Page 41: ...V SMD U C 0603 ROHS 1 PC 660 R502 414916033050R RES SMD 0603 33Ω J RT RoHS REV A 1 PC 670 R507 414916330410R RES SMD 0603 3 3M F RT RoHS 1 PC 680 R512 R522 414916330210R RES SMD 0603 33KΩ F RT RoHS 2 PC 690 R513 R501 414916100210R RES SMD 0603 10KΩ F RT RoHS 2 PC 700 R514 414916220210R RES SMD 0603 22KΩ F RT RoHS 1 PC 710 R516 414916604310R RES SMD 0603 604KΩ F RT RoHS 1 PC 720 R521 R519 R518 4149...

Page 42: ... PC 1000 R812 414020689540R RES FSM 1 4W 6 8Ω J AT MINI RoHS 1 PC 1010 FB501 432002200240R Bead Cores 25Ω 100M 3A 2 5X3X0 65 RoHS 1 PC 1020 C813 418210133030R CAP CD X7R 100pF 1KV K VT RoHS 1 PC 1030 C802 C811 418210227030R CAP CD X7R 1000pF 500V K VT RoHS 2 PC 1040 C817 C822 419111040030R CAP MTL X7R 0 1uF 50V K VT RoHS 2 PC 1050 C814 C815 C818 C819 420264700230R CAP SH 47uF 25V M 125 VT 6 3x11 R...

Page 43: ...43 SCHEMATIC DIAGRAM 1 DC to DC ...

Page 44: ...44 2 Input ...

Page 45: ...45 3 Scaler_TSUM16AL ...

Page 46: ...46 4 Keypad ...

Page 47: ...47 5 Inverter ...

Page 48: ...48 6 Power r ...

Page 49: ...49 2007 P NO Printed in Korea ...

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