Power (Include If +5Vand +3.3V) Supply Normal But Led Amber - Dell ST2010 Service Manual

Service Manual
END
5. Power (include IF +5Vand +3.3V) supply normal but LED
Amber
Is Power LED Amber?
YES
Do the Hsync. & Vsync. Signals exist
in CN102 #13& #14 separately when
select VGA mode by OSD?
YES
Do the Hsync. & Vsync. Signals exist
in R136 & R136
YES
Do the Hsync. & Vsync. Signals exist
in U105#32& #33?
YES
Change U105
END
42
NO
Insert VGA Cable correctly
NO
Check R135 & R136
NO
Check R133 & R134