Dell SP2009W - Widescreen LCD Monitor Service Manual page 54

20" LCD Color Monitor
No Backlight
Check CN902 pin7, 8 = 5V
Check IC801 PIN12=13V
Check IC801 PIN10, 9 have the output of square wave at short time
Check Q803,Q802 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
NG
OK
NG
OK
NG
OK
NG
OK
Check adapter or MB
NG
Check Interface board
Change Q802, Q803
Change IC801
Check Q802, Q803,D810, D812, Q801 ,Q804,Q811andQ812
Change T801,T802
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Dell SP2009Wc