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LG L192WS-BNQ, Service Manual

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LG L192WS-BNQ Service Manual Download Page 17

 

17

                                                                           

 

3. 

DC output voltage is unstable 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

 

 

 

 

Check R810, R811 

Check feedback 

circuit 

Check Vpin3-4 of 
IC801 about 6V 

Check Vpin1-2 of 
IC801 about 1V 

Check C815, D806,
R812 

Check R809, 
R814 

END 

1. 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 

Summary of Contents for L192WS-BNQ

Page 1: ...ww LGEservice com techsup html COLOR MONITOR SERVICE MANUAL MODEL L192WS BNQ SNQ A JQP A QQP Same model for Service CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL To apply the MSTAR Chip ...

Page 2: ... Ratio 10 a For InnoLux MT190AW01 V2 panel Left 80 Right 80 Top 80 Bottom 80 at type CR 10 b For CMO M190A1 L02 panel Left 85 Right 85 Top 80 Bottom 80 at type CR 10 2 2 Luminance a For InnoLux MT190AW01 V2 panel 300cd m 2 Typ 220cd m 2 Min 6500k 170 cd m 2 Min 9300k b For CMO M190A1 L02 panel 300cd m 2 Typ 220cd m 2 Min 6500k 170 cd m 2 Min 9300k 2 3 Contrast Ratio a For InnoLux MT190AW01 V2 pane...

Page 3: ...lace with the new backlight CCFL or inverter circuit 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 E...

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: ...s 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 0 75 062 915 870 3 3 39 1152 x 870 H Pixels 61 805 1504 1152 18 134 200 11 V Lines 92 978 65 96 937 900 ...

Page 8: ...and assy until click then take out the stand assy into the product in the correct direction as shown in picture Pry the hinge cover by flat tip screw driver or jig and be careful to prevent from scratching the hinge cover Pull up the front cover side by side 4 sides and take away the front cover Turn over the set and pull up the cabinet to separate the control cable then take away the back cover ...

Page 9: ...9 8 7 Pull out the LVDS cable Pull out the lamp wire ...

Page 10: ...s Timing parameters Key pad 24C02 DDC 128KB Flash ROM 14V 5V Inverter Power AC to DC 14V 5V BLOCK DIAGRAM L192WS consists of a main body and a stand base The main body contains a InnoLux or CMO LCD module with 4 CCFL lamps a power board includes AC DC DC DC inverter and panel power source a control board key pad and an interface board The block diagram is shown as below ...

Page 11: ... 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 12: ...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 13: ... is available to LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button ...

Page 14: ...e 24C04 c CLEAR ETI To initialize using time d AGING Select Aging 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 Enab...

Page 15: ...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 voltage is 5 8V Check R812 R816 C818 END ...

Page 16: ...526 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 again No Check feedback circuit Isen Vsen D501 D502 D503 D504 D507 D508 Yes END Is there 5Vdc voltage on pin2 of IC501 Yes Yes ...

Page 17: ...bout 6V Check Vpin1 2 of IC801 about 1V Check C815 D806 R812 Check R809 R814 END 1 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 18: ...814 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 R818 ...

Page 19: ...heck Crystal Pin96 Pin97 Of U105 Check CCFL Enable pin85 of U105 MCU imbedded in Scaler IC Fail Check FB103 Check X101 C153 C154 Inverter Fail OK NG NG OK OK NG Check Reset pin84 Of U105 Check pin5 of CN101 Check R167 Q106 R108 R110 Check C144 R172 OK NG NG NG OK OK Check pin32 49 56 and 75 Of U105 NG OK And U102 Check FB106 And U101 ...

Page 20: ...VDS Cable Check 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 OK ...

Page 21: ...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 22: ...22 WIRING DIAGRAM ...

Page 23: ... 23 EXPLODED VIEW 050 150 140 010 020 030 040 170 060 070 080 090 160 100 110 120 130 ...

Page 24: ...ROHS 080 MEY37547401 501030205700R BUTTON FUNCTION KEY B LE1957 ROHS 090 MEY37547601 501030205710R BUTTON POWER KEY B LE1957 ROHS 100 ACQ32904401 714020008900R ASSY BASE B LE1957 110 ACQ32904601 714010009300R ASSY STAND B LE1957 120 ACQ32904701 714010009310R ASSY STAND NECK LE1957 130 MCK37548201 501020212000R COVER HINGE B LE1957 ROHS 140 MCK37548401 501020211900R COVER BACK B LE1957 ROHS 150 EBU...

Page 25: ...C805 420431214580R CAP SEK 120uF 450V 18 40 M CF 105 90 C824 416204724610R CAP MEY 4700pF 400V M Y F10mm RoHS 100 L802 L803 425000010530R COIL CHK 5uH 7 8X10 CHK 053 0 181085R0L 110 L801 426000050070R CHOKE L FILTER 12mH LIN 007 ET 20 RoHS 120 T801 426000090510R XFMR 750u 1K 8 3m 113m SPW 051 DIP 1 130 RT801 432009401300R NTC 8Ω 4A 13Φ P 7 5mm F ROHS 140 F801 430613430290R FUSE SLOW 3 15 250 Axial...

Page 26: ...BA P I BOARD SMD LE1957 610 ROHS 10 Q801 410500045210R XSTR PMBT3904 NPN 200MA 40V SOT23 PHILIP 10 RA 410500045140R XSTR MMBT3904LT1G NPN 200MA 40V SOT23 ON 10 RA 410500045090R XSTR MMBT3904 NPN SOT 23 PANJIT RoHS 20 IC501 412000455630R IC OZ9938GN SOIC16 O2 MICRO RoHS 30 D501 D502 D503 D504 D507 D508 411020026210R DIO BAV99 350mW 70V SOT 23 PHI RoHS 30 RA 411020026390R DIO BAV99 SOT 23 INFINEON R...

Page 27: ...20 414908330110R RES SMD 0805 3 3KΩ F RT RoHS REV A 230 R523 414916330210R RES SMD 0603 33KΩ F RT RoHS 240 R527 414916330410R RES SMD 0603 3 3M F RT RoHS 250 R801 R805 R822 R823 414908033550R RES SMD 0805 3 3MΩ J RT RoHS 270 R522 414916453210R RES SMD 0603 45 3KΩ F RT ROHS 280 R509 R539 R540 R541 R542 414916470010R RES SMD 0603 470Ω F RT RoHS 290 R825 414908047450R RES SMD 0805 470KΩ J RT RoHS 300...

Page 28: ... AT PHIL RoHS 80 RA 411022003020R DIO 1N4148 LF 75V 0 15A AT FEC RoHS 80 RA 411020048090R DIO 1N4148 35 75V 0 15A DO35 P EC RoHS 90 D804 411020053090R DIO PS1010R 1000V 1A DO 41 PAN JIT RoHS 90 RA 411032006020R DIO FR10 10 LF 1000V 1A AT FRO NTIER RoH 100 ZD802 411020050090R DIO P6KE150A DO 15 AT PANJIT RoHS 100 RA 411020050020R DIO P6KE150A LF AT FRONTIER RoHS 100 RA 411020050010R DIO P6KE150A DO...

Page 29: ... 90 RA 410072013370R XSTR 2SC1815 GR T2SPF T VT TOSHIBA Ro 90 RA 410072013150R XSTR UTC2SC1815L GR NPN TO92 UTC RoHS 100 IC803 412022002840R IC TL431ACLPG TO 92 1 VT ON RoHS 100 RA 412022002240R IC KA431AZ 1 VT FAIRCHILD RoHS 100 RA 412022002300R IC AP431VL TO 92 1 VT ATC RoHS 100 RA 412022002830R IC AS431 TO 92 VT A1SEMI RoHS Item Location P N Description 700000000300R ASSY PCB RIVENT LE1957 ROHS...

Page 30: ...49US 30PPM DIP 80 CN103 440819015030R CON D SUB FEM 15P RA W O SCREW DZ11AA1 H Item Location P N Description 790841340600R PCBA I F BOARD SMD LE1957 610 ROHS 10 Q103 Q106 410500045210R XSTR PMBT3904 NPN 200MA 40V SOT23 PHILIP 10 RA 410500045140R XSTR MMBT3904LT1G NPN 200MA 40V SOT23 ON 10 RA 410500045090R XSTR MMBT3904 NPN SOT 23 PANJIT RoHS 20 Q102 Q105 410500046210R XSTR PMBT3906 PNP 200MA 40V S...

Page 31: ...SOIC 8 SST RoH 130 RA 412000486310R IC PM25LV010A 100SCE SOIC8 PMC RoHS 130 RA 412000486190R IC PS25LV010A 100SCE SOIC8 MSTAR RoHS 140 R190 R170 R171 R103 414916000050R RES SMD 0603 0Ω J RT RoHS 150 R186 R187 414916010050R RES SMD 0603 10Ω J RT RoHS 160 R130 R129 R114 R117 R120 R125 R127 R131 R132 R101 R167 R168 R178 R179 R124 414916010150R RES SMD 0603 100Ω J RT RoHS REV A 170 R157 R158 R159 R160...

Page 32: ...957 610 ROHS 10 C111 C144 420431000260R CAP EC 10uF 25V M 105 ST 5x11 RoHS 20 C101 C102 420431010461R CAP EC 100uF 16V M 105 ST 5x11 SK RoH 30 C130 C133 C142 C145 C105 420432200460R CAP EC 22uF 16V M 105 ST 5x11 RoHS 40 C108 420432210460R CAP EC 220uF 16V M 105 ST 6 3x11 RoHS 50 CN101 430631060020R WAFER 2 0mm 6P 180 RoHS 60 CN105 430631080130R WAFER 2x4P 2 0mm 200PHD 2 4ST RoHS 70 X101 4320080103...

Page 33: ...414916010450R RES SMD 0603 100KΩ J RT REV A RoHS 200 R105 414916020350R RES SMD 0603 20KΩ J RT RoHS REV A 210 R136 R137 414916022250R RES SMD 0603 2 2KΩ J RT RoHS 220 R121 414916047150R RES SMD 0603 470Ω J RT RoHS REV A 230 R108 R110 R149 R150 R154 R155 R173 R174 R166 R182 R183 R184 R185 R109 R122 414916047250R RES SMD 0603 4 7KΩ J RT RoHS 240 R169 414916390010R RES SMD 0603 390Ω F RT RoHS 250 R13...

Page 34: ...34 SCHEMATIC DIAGRAM 1 DC to DC 2 Input ...

Page 35: ...35 3 Scaler_TSUM16AL 4 Key Pad ...

Page 36: ...36 5 Inverter 6 Power ...

Page 37: ...37 Nov 2006 P NO MFL36713651 Printed in China ...

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