Asus VK222U/S Service Manual page 41

22" LCD Color Monitor
2.) W / LED, No Backlight
Check CN902 pin4, 5 = 12V
Check ON/OFF signal
Check IC801 PIN12=12V
Check IC801 PIN10, 9 have the output of square wave at short
Check Q802, Q803 PIN5, 6, 7, 8 have the output of square wave at short time.
Check the output of T801, T802
Check connecter & lamp
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OK
NG
OK
NG
OK
NG
NG
OK
NG
OK
OK
NG
Check adapter or MB
Check Interface board
Change Q808
Change IC801
Check Q801, Q804, Q811, Q812, Q802, Q803
Change T801, T802
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ASUS VK222U/S