Dell SP2309Wc Service Manual page 57

23" LCD Color Monitor
No Backlight
Check IC801 PIN12=13V
Check IC801 PIN10, 9 have the output of square wave at short time
Check Q803,Q809 PIN5, 6, 7, 8 have the output of square wave at short time.
Check the output of T801,T802
Check connecter & lamp
Check R802 =13V
OK
NG
Check ON/OFF signal
OK
NG
OK
NG
OK
NG
OK
NG
OK
Check adapter or MB
NG
Check Interface board
Change Q804, Q803
Change IC801
Check Q802, Q809,Q810, Q811, Q805 ,Q806
Change T801,T802
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Dell SP2309Wc