Dell S1909WXf Service Manual page 34

Backlight on, key function and LED accurate indication ok but no picture
Backlight on, key function and LED
accurate indication ok but no picture
IS the display is white and cannot
display OSD when press key?
Is display selftest picture at
VGA mode or DVI mode?
Is there DVI signal in U104
#39, #40, #42, #43, #45, #46,
#48 #49?
Change
D108,D109,D110,D111,D112,
D113,D114,D115
YES
YES
NO
VGA
DVI
YES
Check DC 5.0V on
CN106#1, #2, #3
Is there R.G.B signal in
U104 #59, #56 #54?
Yes
Are there data output on
U104#105~#114,
#118~#127
No
Change U104
END
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Service Manual
NO
Is the panel enable
signal at 75# of
U104,if no check
Q106 circuit or change
U104,if yes Check
Q103 circuit
NO
Change D101,
D102 & D103
YES
Is the FFC cable
inserting ok,if no
reinsert else
change FFC cable