LG Flatron L1754SM Service Manual Download Page 20 | Manualshive

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6

. POWER

NO POWER

(POWER INDICATOR OFF)

NO

Trouble in Fuse (F101)

CHECK 5V, 1

5

V Line

NO

NO

Check

D104,D105,D106,D107

Check U101 Pin7 : 9~10V
Check D102

Trouble in Q101

NO

Trouble in D201, D202

,D203

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

D203,

Voltage

YES

YES

YES

YES

NO

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Summary of Contents for Flatron L1754SM

Page 1: ...LOR MONITOR SERVICE MANUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM76B MODEL L1754SM L1754SM FS K P Same model for Service ...

Page 2: ...Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz 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 SWIVEL Width 371 3mm 14 ...

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: ... 5 Please pull the stand body lightly to separate it from the hinge body 6 Remove the screws 7 Pull the front cover upward then separate all the latches 8 Place the monitor face down then disassemble back cover 2 Place the monitor face down on the cushion or soft cloth 3 Slide the Cable Deco Cover out from the stand body ...

Page 9: ...AM ADC TMDS OSD MCU LVDS Transmitter Scaler Flash memory Analog R G B D Sub Audio EEPROM 24C08 1EA Adapter Inverter Power 5V 15V Regulator 3 3V 12V 1 8V 3 3V 1 8V TO key control LVDS 5V UP stream NT68625 68665 68670 ...

Page 10: ...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 15V 13V 5V Inverter On OFF 3 3V Dimming Lamp Current Control Aux Drive Start Module Vcc Main Board Scaler DC DC converter 15V 5V ...

Page 11: ...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 DC15V to AC 700Vrms and operates b...

Page 12: ...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 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: ... of the 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 ...

Page 15: ...POINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms IC501 96 CHECK KEY CONTROL CONNECTOR ROUTINE CHECK IC501 NO NO CHECK 3 3V LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES CHECK J703 VOLTAGE PIN5 PIN6 5V CHECK IC701 PIN2 VOLTAGE 3 3V IS IC501 PIN75 3 3V VOLTAGE CHECK IC501 PIN 96 PULSE 1 YES YES YES ...

Page 16: ...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 J703 PIN5 PIN6 5V J703 PIN9 5V J703 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 17: ...CK C509 C511 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN IC501 CHECK CONNECTION LINE FROM D SUB TO IC501 IC501 PIN96 97 OSCILLATE AS 14 31MHZ IC501 PIN27 IS 48KHz H SYNC PIN28 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms IC501 96 97 IC501 27 H SYNC 2 IC501 28 V SYNC YES YES YES IC501 PIN 16 75 3 3V ...

Page 18: ...O Audio IC901 PIN3 12V IC902 PIN14 17 output Check J703 PIN 1 2 5V Check Power supply Assembly Check Speaker or earphone JACK Check IC 901 IC 902 PIN 4 9 input Check J901 Check IC 902 NO NO NO NO YES YES YES YES YES ...

Page 19: ... 5 TROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN IC501 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R713 R714 CHECK IC501 PIN 27 28 SYNC PULSE 3 3 Waveforms H Sync 3 V Sync YES YES ...

Page 20: ...heck D104 D105 D106 D107 Check U101 Pin7 9 10V Check D102 Trouble in Q101 NO Trouble in D201 D202 D203 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 D203 Voltage YES YES YES YES NO ...

Page 21: ... Check the waveform of U301 Pin1 15 Check the waveform of U301 Pin2 3 NO If waveform is no problem Check D302 D308 Or Trouble in U303 U304 YES CHECK P201 Pin9 3 3V Check U301 Pin2 5V Check U301 Pin6 VSEN Less than 3V Check U301 Pin12 SSTCMT Less than 1V Check U303 U304 Drain waveform YES YES YES NO ...

Page 22: ... 22 WIRING DIAGRAM 11P 6P 30P EAD30368603 6631T20023J 6631900109A ...

Page 23: ...500 310 300 200 440 400 410 510 430 420 520 900 910 920 930 EXPLODED VIEW 23 ...

Page 24: ...and base Assy_black ABJ33743001 LCD Module TFT LM170E03 TLL3 DRIVER 17 0INCH 1280X1024 300CD COLOR 72 4 3 800 1 P5 5ms 160 160 TLIT on Managna Toshiba Source Gate LG PHILIPS LCD EAJ36380701 200 LCD Module TFT LM170E03 TLL2 DRIVER 17 0INCH 1280X1024 300CD COLOR 72 4 3 800 1 P6 5ms 160 160 TLI T con Lusem Toshiba Source Gate Diffuser x2 Prism x1 lamp wire 135m LG PHILIPS LCD EAJ36379501 LCD Module T...

Page 25: ... C914 0CK474DH56A Capacitor Ceramic Chip C2012X7R1E474KT 470n C915 0CK474DH56A Capacitor Ceramic Chip C2012X7R1E474KT 470n D702 0DS226009AA Diode Switching KDS226 1 2V 85V 300M D703 0DS226009AA Diode Switching KDS226 1 2V 85V 300M D704 0DS226009AA Diode Switching KDS226 1 2V 85V 300M D901 0DS226009AA Diode Switching KDS226 1 2V 85V 300M D902 0DS226009AA Diode Switching KDS226 1 2V 85V 300M D905 0D...

Page 26: ... MCR03EZPJ000 0OHM 5 R902 0RJ1200D677 Resistor Chip MCR03EZPJ121 120OHM R903 0RJ1200D677 Resistor Chip MCR03EZPJ121 120OHM R904 0RJ4703D677 Resistor Chip MCR03EZPJ474 470KOHM R905 0RJ4703D677 Resistor Chip MCR03EZPJ474 470KOHM R906 0RJ3900D677 Resistor Chip MCR03EZPJ391 390OHM R907 0RJ3900D677 Resistor Chip MCR03EZPJ391 390OHM R908 0RJ3900D677 Resistor Chip MCR03EZPJ391 390OHM R909 0RJ3900D677 Res...

Page 27: ... 27 1 SCALER SCHEMATIC DIAGRAM ...

Page 28: ... 28 2 POWER WAFER ...

Page 29: ... 29 3 INVERTER ...

Page 30: ... 30 4 POWER 1 3 2 4 5 1 7 4 3 6 ...

Page 31: ...Jul 2007 P NO MFL30290844 Printed in China ...

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