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LG Flatron L1730SF (L1730SFKN.A**MEP), Service Manual

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LG Flatron L1730SF (L1730SFKN.A**MEP) Service Manual Download Page 8

- 8 -

Copyright 

2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LGE Internal Use Only

DISASSEMBLY

Remove the screws.

# 1

Cover the panel with your hand so that it is not
scratched. Then, pull up the cabinet corner side.

Remove the 4 screws from each side of metal
frame.

Disassemble  inverter  shield  something thin.

# 2

# 4

# 5

Disassemble the back cover from left side.

# 3

Summary of Contents for Flatron L1730SF (L1730SFKN.A**MEP)

Page 1: ...OR SERVICE MANUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM57A MODEL L1730SF L1730SFN A MEP L1730SF L1730SFKN A MEP Same model for Service Internal Use Only ...

Page 2: ...3 Contrast Ratio 500 min 800 Typ 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Composite 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 71 V a Color 0 0 0 Vp p b Color 7 0 0 467 Vp p c Color 15 0 0 714 Vp p 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power...

Page 3: ... pen as this may result in damage to the panel 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 ...

Page 4: ...eat sinks are correctly installed 8 Always connect the test 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 Sen...

Page 5: ... by gently prying up on the lead with the soldering iron 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 b...

Page 6: ... and carefully crimp it around the IC pin Solder the IC connection 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 ...

Page 7: ... 628 600 1 4 23 6 H Pixels 49 5 46 875 1056 800 16 80 160 800 x 600 V Lines 75 0 625 600 1 3 21 7 H Pixels 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 ...

Page 8: ...s LGE Internal Use Only DISASSEMBLY Remove the screws 1 Cover the panel with your hand so that it is not scratched Then pull up the cabinet corner side Remove the 4 screws from each side of metal frame Disassemble inverter shield something thin 2 4 5 Disassemble the back cover from left side 3 ...

Page 9: ...purposes LGE Internal Use Only TSUMx6AL ADC TMDS Rx MStarACE LVDS Tx LVDS Analog R G B D Sub 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 BLOCK DIAGRAM ...

Page 10: ... High Low POWER INVERTER Inverter Control 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 BLOCK DIAGRAM POWER ...

Page 11: ...og to digital interpolates input to 1280 X 1024 resolution 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 ...

Page 12: ... part function is for transfer the input AC voltage to a 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 duri...

Page 13: ...eed setup Windows 2000 XP Need to Port Setup This program 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...

Page 14: ...OSD 1 Turn off the power switch at the front side 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 m...

Page 15: ...WER INDICATOR OFF NO CHECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms U201 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 J403 VOLTAGE PIN5 PIN6 5V CHECK U301 PIN2 VOLTAGE 3 3V IS U201 PIN75 3 3V VOLTAGE CHECK U201 PIN 96 PULSE 1 YES YES YES ...

Page 16: ...O NO NO REPLACE CCFL LAMP IN THE LCD MODULE CHECK POWER BOARD 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 J403 PIN5 PIN6 5V J403 PIN9 5V J403 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: ...YED NO NO NO TROUBLE IN CABLE OR LCD MODULE CHECK U301 1 CHECK C210 C211 SOLDERING CONDITION 2 CHECK X201 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U201 U201 PIN96 97 OSCILLATE AS 14 31MHZ U201 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 U201 27 H SYNC 2 U201 28 V SYNC YES YES YES U201 PIN 16 75 3 3V ...

Page 18: ...r training and service purposes LGE Internal Use Only 4 TROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U201 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R442 R443 CHECK U201 PIN 27 28 SYNC PULSE 3 3 Waveforms R442 H Sync 3 R443 V Sync YES YES ...

Page 19: ...POWER INDICATOR OFF NO Trouble in Fuse F101 CHECK 5V 12V 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 20: ...utput Main Board CHECK T301 T302 NO NO Check Q301 Q302 Check 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 CW310 Pin9 5V 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 21: ...21 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only WIRING DIAGRAM USB Type 30P 11P 5P 6P 6631900109A 6631T20020Q 6631T20024C EAD36175601 ...

Page 22: ...2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only WIRING DIAGRAM RS232C Type 30P 11P 5P 6P 6631900109A 6631T20020Q 6631T20024C EAD36175601 ...

Page 23: ...EXPLODED VIEW 23 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 040 010 020 050 060 070 080 100 030 130 090 120 110 ...

Page 24: ...FN BRAND 090 6871TST804P PCB Assembly Sub CONTROL T T PB FREE L1731SFN BRAND for 3M Touch screen 100 4951TKS187D Plate Assembly FRAME MAIN L1730SFN USB 110 4814TKK235A Plate PRESS SPTE C T0 3 INVERTER CAP TOP L1715 120 4814TKK235B Plate PRESS SPTE C T0 3 INVERTER CAP BOTTOM L1715 130 6410TEW010A PowerCord CEE LP 34A H05VV FX3C LS 60_1 87M_BLKLP 34ALS 601 87MNONE250V16AH05VV F3X0 75MM2BLACKVDESEMKO...

Page 25: ...1uF 10 10V X7R C432 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R C433 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R C434 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R C438 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R C439 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R C440 0CK105CD56A C1608X7R1A105KT 1uF 10 10V X7R DATE 2007 05 16 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D404 0DD184009AA KDS184 KDS184 TP K...

Page 26: ...HM 5 1 10W 1608 R422 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 16 R423 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 16 R438 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 16 R439 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10W 16 R440 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W 1608 R441 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1608 R442 0RJ0682D677 MCR03EZPJ680 68OHM 5 1 10W 1608 R443 0RJ0682D677 MCR03EZPJ680 68OHM 5 1 10...

Page 27: ...SCHEMATIC DIAGRAM 27 1 SCALER Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ... 28 2 POWER WAFER Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ... 29 3 CONTROL Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 30: ...May 2007 P NO MFL38456748 Printed in Korea ...

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