Dell UltraSharp 2208WFP, Service Manual

Page: 38 / 63

Service Manual
37
Power (include IF +5Vand +3.3V) supply and display normal but
LED Amber
Is Power LED Amber?
Do the Hsync. & Vsync. Signals exist
in CN102 #13& #14 separately when
select VGA mode by OSD?
Do the Hsync. & Vsync. Signals exist
in R133 & R134?
Do the Hsync. & Vsync. Signals exist
in U105#9& #8?
Is the Q108 work normal
Is theLED control signal at 48# of
U108 high-low convertible when DC
on/off
END
Insert VGA Cable correctly
Check R133 & R134
Change R135 & R136
Change Q108
NO
NO
NO
NO
YES
YES
YES
YES
YES
Change U108
NO