Dell S1909WXf Service Manual page 32

Power (include IF +5Vand +3.3V) supply and display normal but LED Amber
Is Power LED Amber?
Do the Hsync. & Vsync. Signals exist
in CN101 #13& #14 separately when
select VGA mode by OSD?
Do the Hsync. & Vsync. Signals exist
in R115 & R116?
Do the Hsync. & Vsync. Signals exist
in U104#63& #64?
Is the Q108 work normal?
Is theLED control signal at 35# of
U104 high-low convertible when DC
on/off
YES
YES
YES
YES
YES
END
NO
Insert VGA Cable correctly
NO
Check R115 & R116
NO
Change R115 & R116
NO
Change Q108
Change U104
NO
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Service Manual