Asus VB191D Service Manual page 38

19" LCD Color Monitor ASUS VB191D
2.) W / LED, No Backlight
Check CN902 pin4, 5 = 12V
OK
NG
Check adapter or MB
Check ON/OFF signal
OK
NG
Check Interface board
Check IC801 PIN12=12V
OK
NG
Change Q808 or Q805
Check IC801 PIN10, 9 have the output of square wave at short
NG
OK
Change IC801
Check Q802, Q803 PIN5, 6, 7, 8 have the output of square wave at short time.
NG
OK
Check Q801, Q804, Q811, Q812, Q802, Q803
Check the output of T801, T802
OK
NG
Change T801, T802
Check connecter & lamp
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