Dell E1709W - No Picture with Backlight On

Service Manual
33
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 there R.G.B signal in
U105 #13, #10 #8?
Is the panel enable
signal at 28# of
U105,if no check
Q104 circuit or change
U105,if yes Check
Q
101 circuit
Check DC 5.0V on
CN101#1, #2,
Are there data output on
U105#105~#114,
#118~#127
Change U105
END
Change D103,
D104 & D105
YES
YES
VGA
YES
NO
NO
NO
Is the display is white and cannot
display OSD when press key?
Yes
Is the FFC cable
inserting ok,if no
reinsert else
chan
g
e FFC cable
No
Is display selftest picture at
VGA mode?