Dell 1909Wf, Руководство по обслуживанию

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Service Manual
38
5. 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 #28, #25 #23?
Is the panel enable
signal at 73# of
U105,if no check
Q104 circuit or change
U105,if yes Check
Q101 circuit
Check DC 5.0V on
CN103#1, #2, #3
Are there data output on
U105#77~#86,
#91~#100
Change U105
END
Check VGA input
circuit (D105, D1
D103 R114 R115 R116
C113 C114 C115)
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
change FFC cable
No
Is display selftest picture at
VGA mode or DVI mode?
DVI
Is there DVI signal in U105 #9,
#10,#12,#13,#15,#16,#18 #19?
YES
Check DVI input circuit
(D202~D209 and
R201~R208)