Asus VK222U Service Manual page 41

22" LCD Color Monitor
2.) W / LED, No Backlight
Check CN902 pin4, 5 = 12V
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
OK
NG
Check ON/OFF signal
OK
OK
NG
NG
OK
NG
OK
OK
NG
Check adapter or MB
NG
Check Interface board
Change Q808
Change IC801
Check Q801, Q804, Q811, Q812, Q802, Q803
Change T801, T802
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ASUS VK222U/S