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LG L195, Service Manual, Page: 16 / 33

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LG L195 Service Manual Download Page 16

- 16 -

TROUBLESHOOTING GUIDE

1. NO POWER

NO POWER

(POWER INDICATOR OFF)

NO

CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING 
EACH POWER LINE

NO PROBLEM

1

Waveforms

U101-#96

CHECK KEY CONTROL

CONNECTOR ROUTINE

CHECK U201

NO

NO

CHECK  3.3V LINE

(OPEN CHECK)

CHECK 3.3V LINE

NO

CHECK X-TAL

YES

CHECK J302

VOLTAGE 

PIN5, PIN6 (5V)?

CHECK 

U202 PIN 3 VOLTAGE

(3.3V) ?

IS U101 

PIN76 (3.3V) 

VOLTAGE ?

CHECK U101 PIN 96 

PULSE

1

YES

YES

YES

Summary of Contents for L195

Page 1: ...SERVICE MANUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM57B MODEL L1953H L1953H BFQ A MQP To apply the MSTAR Chip Same model for Service ...

Page 2: ...perating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz Digital 1280 x 1024 60Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 0 8A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F Ambient 6 2 Relative Humidity 10 80 Non condensing 6 3 MTBF 50 000 HRS with 90 Confidence Lamp Life 50 000 Hours Min 7 DIMENSIONS with TILT ...

Page 3: ... Protect the module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty pl...

Page 4: ...st 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 ...

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: ...onnection 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 t...

Page 7: ...ls 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 8 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V Lines 60 0 806 768 3 6 29 9 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 10 H Pixels 100 0 68 681 1456 1152 32 128 144 1152 x 870 V Lines 75 062 915 870 3 3 39 11 H Pixels 92 978 61 805 1504 1152 18 134 200 1152 x 900 V Lines 65 9...

Page 8: ... your hold on the product as it follows and turn the Stand Base in the arrow direction until you hear a click Pull out the Stand to remove 1 2 3 Remove the screws 1 Pull the front cover upward 2 Then let the all latches are separated 3 Put the front face down Disassemble back cover 4 5 6 ...

Page 9: ...ld the body of the Stand as it follows Press the two latches at the same time as it follows Pushing Latch inside Take the stand base from stand body The body of the Stand and the Stand Base are successfully separated 1 2 4 3 ...

Page 10: ...CE LVDS Tx LVDS Analog R G B Analog R G B D Sub DVI D LIPS Filter 5V 12V 5V 3 3V 1 8V Vcc 5V 5V Scaler MCU Intel8032 Inverter 4 lamps 12V Regulator KEY 3 3V 1 8V Line Buffer OSD SSC EEPROM System Module 3 3V SDA SCL 3 3V Flash ROM 12V EEPROM EDID ...

Page 11: ...trol IC P ch N ch Inverter Trans SMPS Lamp Current Feedback Over Voltage Protection Power Control IC Feedback Line Filter L N Drive Block 12V 12V 5V Inverter On OFF 3 3V Dimming Lamp Current Control Aux Drive Start Module Vcc Main Board Scaler DC DC converter 12V 5V ...

Page 12: ...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 12V 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 DC12V to AC 700Vrms and operates b...

Page 13: ...DC voltage through a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is for transfer the primary energy 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 ach...

Page 14: ... 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 15: ...display 2 Wait for about 5 seconds and press MENU POWER switch with 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a Auto Color W B balance and Automatically sets the gain and offset value b NVRAM INIT EEPROM initialize 24C08 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 9300...

Page 16: ...T POINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms U101 96 CHECK KEY CONTROL CONNECTOR ROUTINE CHECK U201 NO NO CHECK 3 3V LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES CHECK J302 VOLTAGE PIN5 PIN6 5V CHECK U202 PIN 3 VOLTAGE 3 3V IS U101 PIN76 3 3V VOLTAGE CHECK U101 PIN 96 PULSE 1 YES YES YES ...

Page 17: ...OARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK MICOM INV ON OFF PORT 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT LIPS J302 PIN5 PIN6 5V J705 PIN9 5V J705 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE YES YES YES YES ...

Page 18: ...CHECK C108 C109 SOLDERING CONDITION 2 CHECK X101 3 TROUBLE IN U101 CHECK CONNECTION LINE FROM D SUB TO U101 U201 PIN96 97 OSCILLATE AS 14 31MHZ U101 PIN27 IS 48KHz H SYNC PIN28 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U201 96 97 U101 27 H SYNC 2 U101 28 V SYNC YES YES YES U201 PIN 16 76 3 3V ...

Page 19: ...ROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U101 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R332 R333 CHECK U101 PIN 27 28 SYNC PULSE 3 3 Waveforms R332 H Sync 3 R333 V Sync YES YES ...

Page 20: ...Line NO NO Check BD101 Check U101 Pin7 9 10V Check D102 Trouble in Q101 NO Trouble in D201 D202 YES CHECK Fuse F101 OK CHECK C101 Voltage AC110V 160Vdc AC220V 304Vdc CHECK U101 Pin6 Waveform Square wave Come out Check Q101 Drain Waveform Check D201 D202 Voltage YES YES YES YES NO ...

Page 21: ...k the waveform of U301 Pin11 12 19 20 Check the waveform of U301 Pin11 12 19 20 NO If waveform is no problem Check Q303 Q308 Or Trouble in U303 U304 YES CHECK P201 Pin9 3 3V Check U301 Pin3 5V Check U301 Pin2 OVP Less than 1 8V Check U301 Pin10 CMP Less than 2 75V Check U303 U304 Drain waveform YES YES YES NO ...

Page 22: ... 22 WIRING DIAGRAM 11P 6P 3P 30P 6631900011H 6631T20023J 6631900109A 6631900125A ...

Page 23: ... 23 EXPLODED VIEW 010 020 090 100 110 120 030 230 140 130 060 070 080 170 200 150 160 180 190 210 220 040 050 ...

Page 24: ...EG02 68719STA24F PCB Assembly Sub SUB T T LM57A L19XXT S H HM KXRDQPT 6709900027A SMPS AC DC AIVP 100VTO240V 40W 50TO60HZ UL CSA VDE SEV SEMKO FIMKO IMQ OVE BSI WORLD WIDE LIEN CHANG 33139L9041C Main Total Assembly L1952T BFQ KXRDQPT NT CKD BRAND LM57B TSUM56AWL 35509K0247A Cover MOLD ABS AF 320T L1752TX ABS 49509S0034B Plate SHIELD LX52 REAR SHIELD DUAL 49509K0265A Plate HINGE LX52 SPRING 35509K0...

Page 25: ...K500CT 100nF 10 50V C423 0CK104CK56A 0603B104K500CT 100nF 10 50V C424 0CK104CK56A 0603B104K500CT 100nF 10 50V C425 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C426 0CC680CK41A C1608C0G1H680JT 68pF 5 50V DATE 2007 03 02 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C427 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C428 0CC680CK41A C1608C0G1H680JT 68pF 5 50V D405 0DS226009AA KDS226 1 2V 85V 300MA 2A 4NS D406 0...

Page 26: ...752D677 MCR03EZPJ750 75OHM 5 1 10W R450 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10 J401 6630TGA004F KCN DS 3 0062 D SUB 15P 2 29 J402 6630V90219A SMW200 28C 28P 2 0MM 2R STRA DATE 2007 03 02 S AL LOC NO PART NO DESCRIPTION SPECIFICATION J403 6602T20008K SMW200 11P 11P 2 00MM 1R STR J404 6602T20008E SMW200 06P 6P 2 00MM 1R STRA J406 6630TGA005B QH11121 DN0 D DVI 24P 1 90MM U302 0TFVI80067A SI3865BDV E...

Page 27: ... OHM 1 10 W 2012 5 00 D R105 0RD0912Q609 91 OHM 1 4 W 3 4 5 TA52 DATE 2007 03 02 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R106 0RH2201D622 2 2K OHM 1 10 W 2012 5 00 R107 0RD8203A609 820K OHM 1 2 W 7 0 5 00 TA R108 0RD4702A609 47K OHM 1 2 W 7 0 5 00 TA5 R109 0RX0560J609 0 56OHM 1 W 5 TA52 R110 0RX1003K607 100KOHM 2 W 5 TA62 R111 0RD0471Q609 4 70 1 4W 3 5 TA52 R112 0RJ1302E472 13K OHM 1 8 W 1 2...

Page 28: ...O DESCRIPTION SPECIFICATION P402 6630V90218A 35001WR YEONHO 2P 3 5MM DIP P403 6630V90218A 35001WR YEONHO 2P 3 5MM DIP P404 6630V90218A 35001WR YEONHO 2P 3 5MM DIP J30 971 0016 TIN HDC 0 60H NON NON J31 971 0016 TIN HDC 0 60H NON NON 28 ...

Page 29: ...SCHEMATIC DIAGRAM 29 1 SCALER ...

Page 30: ... 30 2 POWER WAFER ...

Page 31: ... 31 3 INVERTER ...

Page 32: ... 32 4 POWER ...

Page 33: ...Mar 2007 P NO MFL3845 Printed in Korea ...

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