Asus MW221C Service Manual page 39

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 Q804, Q809 PIN5, 6, 7, 8 have the output of square wave at short time.
Check the output of PT801, PT802
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 Q801
Change IC801
Check Q804, Q805, Q806, Q809, Q810, Q811
Change PT801, PT802
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ASUS MW221C