LG L204WS Service Manual Download Page 1

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COLOR MONITOR

SERVICE MANUAL

Website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

CAUTION

BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS NO. : LM

72A

MODEL:

204

-SF

.A**

QF)

204

-BF

.A**

QF)

( ) **Same model for Service

Summary of Contents for L204WS

Page 1: ...e http biz LGservice com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM72A MODEL L204WS L204WS SFS A QF L204WS L204WS BFS A QF Same model for Service ...

Page 2: ...art 3 1 Sync Signal Type Separate Sync SOG 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 1680 x 1050 75Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 1 0A 5 2 Power Consumpti...

Page 3: ...e 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 please wipe i...

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: ...4 136 160 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 V Lines 11 H Pixels V Lines 12 H Pixels 108 0 108 0 67 500 1600 1152 64 128 256 1152 x 864 V Lines 75 000 900 864 1 3 32 63 981 1688 1280 48 112 248 1280 x 1024 60 02 1066 1024 1 3 38 135 0 79 976 1688 1280 16 144 248 1280 X 1024 75 035 1066 1024 1 3 38 ...

Page 8: ...ve the screws Disassemble back cover 1 Pull the front cover upward 2 Then let the all latches are separated 1 Open the Cabinet latch with Jig 2 Disassemble Cabinet 3 Put the front face down 1 4 2 3 Disassemble Connector 5 ...

Page 9: ...ter 5V 12V 5V Regulator 3 3V Vcc 5V 3 3V Inverter 12Lamps 12V Flash ROM KEY 1 8V 3 3V Module SDA SCL EEPROM System 3 3V ADC TMDS Rx Scaler MStarACE LVDS Tx OSD MCU SSC Line Buffer 12V gm5726H L204WT 15V Regulator 12V EEPROM EDID BLOCK DIAGRAM ...

Page 10: ...WTQ 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 15V is provided for inverter in L204WT WTM WTQ case 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 ope...

Page 11: ...ough 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 achieve the dc ou...

Page 12: ...m is available for 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 13: ...5 seconds and press MENU POWER switch for 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a CLEAR ETI To initialize using time c Auto Color W B balance and Automatically sets the gain and offset value press key for over 3 sec d AGING Select Aging mode on off b Module To select applied module d NVRAM INIT EEPROM initialize 24C16 press key for...

Page 14: ...ER INDICATOR OFF CHECK U501 NO NO CHECK POWER BOARD LIPS CHECK U901 U902 NO CHECK CRYSTAL X501 YES YES YES CHECK J603 VOLTAGE PIN5 PIN6 5V IS U902 PIN2 1 8V U901 PIN2 3 3V CHECK X501 PULSE 1 2 1 3 1 4 Waveforms 1 J603 5 6 2 U902 2 3 U901 2 4 X501 1 2 ...

Page 15: ... PANEL CHECK U501 CHECK U501 103 0 7V WHITE PANEL CONNECT LVDS CHECK LVDS JOIN NO NO NO CHECK CIRCUIT Q601 Q602 CHECK C601 ANODE 5V REPLACE LCD MODULE YES 1 2 YES YES Waveforms 1 P702 5 6 2 P702 10 3 LAMP CURRENT ...

Page 16: ...LACK PANEL CHECK LVDS SIGNAL NO NO NO CHECK U501 CHECK J603 9 HIGH TENSION CHECK POWER BOARD SMPS YES YES LIGHTNESS LOWER BLACK PANEL YES 1 Waveforms 4 IC501 108 CHECK U501 CHECK Invert HIGH TENSION CHECK POWER EXPORT 12V 5V ...

Page 17: ... PC IS GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK R705 AND R706 SYNC APPEARED CHECK U501 PIN41 42 SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 REPLACE SINGAL LINE YES CHECK R709 HIGH TENSION NO CHECK LINE SF DET CHECK U501 108 HIGH TENSION NO ...

Page 18: ...WIRING DIAGRAM 18 6631900109A Gestesis EAD35660901 EAD30368601 30P 6P 11P ...

Page 19: ...EXPLODED VIEW 19 010 020 070 080 060 090 110 100 120 030 040 050 ...

Page 20: ...35522003 Main Total Assembly L204WTS CPT BRAND LB62 MCK36459401 Cover MOLD ABS L204W ABS vesa plate for L204W_4_LAMPS Module MGJ35936501 Plate Shield PRESS SBHG 0 8mm REAR SECC L204W_4_LAMPS_MODULE AUO MGJ35937301 Plate Shield PRESS SPTE 0 3mm LAMP SPTE L204W_4_LAMPS MODULE EAY37155801 Power Supply Assembly AIP 0156 FREE 22LS4D 4Lamp MFT LCD LienChang 19 20 22 4Lamp MFT LIEN CHANG 3809900217Q Cove...

Page 21: ...SCHEMATIC DIAGRAM 1 SCALER 21 ...

Page 22: ...2 POWER 22 ...

Page 23: ...3 WAFER 23 ...

Page 24: ...JUNE 2007 P NO MFL32179226 Printed in China ...

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