LG Flatron L226WTQ, Service Manual

Page 1: ... Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM74B MODEL L226WTQ L226WTQ BFS A MQP A QQP A VQP L226WTQ L226WTQ WFS A OAP A QAP A VAP Same model for Service ...

Page 2: ...efer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Digital 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 28 83kHz Vertical 56 75Hz 4 MAX RESOLUTION Analog 1680 x 1050 60Hz Digital 1680 x 1050 60Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 1 2A 5 2 Power Consumption 6 ENVIRONM...

Page 3: ...c T M D S Data1 T M D S Data1 T M D S Data1 3 Shield T M D S Data3 T M D S Data3 5V Power Ground return for 5V H Sync and V Sync Pin Signal DVI D 1 8 9 17 24 16 16 17 18 19 20 21 22 23 24 Hot Plug Detect T M D S Data0 T M D S Data0 T M D S Data0 5 Shield T M D S Data5 T M D S Data5 T M D S Clock Shield T M D S Clock T M D S Clock T M D S Transition Minimized Differential Signaling DVI D Connector ...

Page 4: ...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 5: ...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 6: ...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 7: ...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 8: ...x 768 V Lines 60 0 806 768 3 6 29 7 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 8 H Pixels 108 0 67 500 1600 1152 64 128 256 1152 x 864 V Lines 75 000 900 864 1 3 32 9 H Pixels 108 0 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 10 H Pixels 135 0 79 976 1688 1280 16 144 248 1280 x 1024 V Lines 75 035 1066 1024 1 3 38 11 H Pixels 119 6...

Page 9: ...Remove the screws 1 Remove the screws 1 Disassemble PCB 2 Put the front face down Disassemble PCB 2 3 4 5 6 Disassemble back cover 1 Pull the front cover upward 2 Then let the all latches are separated with jig 3 4 7 ...

Page 10: ...s 15V DVI D DVI TMDS KEY 1 8V 1 8V Module SDA SCL EEPROM EDID EEPROM System 3 3V EEPROM EDID 1680X1050 60Hz 146Mhz Dual Interface Engine Display Processing Engine Response Time Enhancement LVDS Panel Interface OSD Clock Generator MCU DRAM TSUMO58CWHJ Flash ROM 3 3V Crystal 14 318MHz BLOCK DIAGRAM ...

Page 11: ...G 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 L226WTQ WTG 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 DC 15V to AC 700Vrms and operates bac...

Page 12: ... 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 output s...

Page 13: ...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 14: ...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 15: ...HECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK U901 3 3V U902 1 8V LINE NO CHECK CRYSTAL X501 YES YES YES CHECK J905 VOLTAGE PIN5 PIN6 5V IS U901 PIN2 3 3V U902 PIN2 1 8V CHECK X501 PIN127 PULSE 1 2 1 3 1 4 Waveforms 1 J905 5 6 2 U901 2 3 U902 2 4 U501 127 ...

Page 16: ... CHECK J905 VOLTAGE PIN5 6 5V NO NO NO NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT CHECK J905 PIN10 POWER BOARD LIPS CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE YES 1 2 3 4 YES YES YES Waveforms 1 J905 5 6 2 J905 9 3 J905 10 Brightness 100 5 LAMP CURRENT 3 J905 10 Brightness 0 ...

Page 17: ...U501 CHECK U501 PIN114 3 3V PIN21 1 8V NO NO NO CHECK U901 3 3V U902 1 8V U501 PIN 127 128 14 3MHZ CHECK CONNECTION LINE FROM D SUB TO U501 TROUBLE IN CABLE OR LCD MODULE YES YES NO RASTER OSD IS NOT DISPLAYED CHECK U501 PIN32 H SYNC AND PIN33 V SYNC IS PULSE APPEARED AT SIGNAL PINS YES 1 Waveforms 1 U501 127 ...

Page 18: ...OUBLE IN DPM TROUBLE IN DPM TROUBLE IN U501 CHECK PC PC IS GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK R718 AND R719 SYNC APPEARED CHECK U501 PIN 32 33 SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 ...

Page 19: ...EXPLODED VIEW 19 300 520 310 430 330 320 900 910 920 200 500 510 420 410 400 ...

Page 20: ...VI D SUB Black ACQ31701719 Cover Assembly Rear L225W LM62A 23 Backcover CMO DVI D SUB mercury C SKD For U S A ACQ31701720 Cover Assembly Rear L225W LM62A 23 Backcover LPL DVI D SUB mercury C SKD For U S A ACQ31701701 Cover Assembly Rear L225W LM62A 23 Backcover CMO DVI D SUB C SKD For Japan Russia ACQ31701733 Cover Assembly Rear L225W LM62A 23 Backcover LPL DVI D SUB White EU 410 MGJ33948901 Plate...

Page 21: ...F56A Capacitor Ceramic Chip0603B104K1 C533 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C534 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C535 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C536 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C537 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C538 0CK104CF56A Capacitor Ceramic Chip0603B104K1 C539 0CC080CK11A Capacitor Ceramic ChipC1608C0G1H C540 0CC080C...

Page 22: ...0RJ1801D677 Resistor ChipMCR03EZPJ182 1 8KOH R5 0RJ1201D677 Resistor ChipMCR03EZPJ122 1 2KOH R501 0RJ1000D677 Resistor ChipMCR03EZPJ101 100OHM R502 0RJ0562D677 Resistor ChipMCR03EZPJ560 56OHM R503 0RJ1000D677 Resistor ChipMCR03EZPJ101 100OHM R504 0RJ0562D677 Resistor ChipMCR03EZPJ560 56OHM R505 0RJ4700D677 Resistor ChipMCR03EZPJ471 470OHM R506 0RJ1000D677 Resistor ChipMCR03EZPJ101 100OHM R507 0RJ0...

Page 23: ...sistor ChipMCR03EZPJ000 0OHM 5 R911 0RJ1002D677 Resistor ChipMCR03EZPJ103 10KOHM R912 0RJ3900D677 Resistor ChipMCR03EZPJ391 390OHM C1 6631900109A Harness Single FOOSUNG DCE153B 2 C2 6631V12031F Harness Single12505HS 0400 12505 C3 6631T12006E Harness Single6P 1 25MM _220MM 1 C4 6631T20034P Harness Single11P M203WTB SMH20 J1 6602T12005E Connector Wafer12505WR 06A00 6P J2 6602T12005C Connector Wafer1...

Page 24: ... 24 PRINTED CIRCUIT BOARD MAIN TOP MAIN BOTTOM ...

Page 25: ... 25 CONTROL ...

Page 26: ...SCHEMATIC DIAGRAM 26 1 SCALER ...

Page 27: ... 27 2 POWER WAFER ...

Page 28: ... 28 3 CONTROL ...

Page 29: ...May 2007 P NO MFL38456741 Printed in Korea ...