Dell E190Sf - No Picture with Backlight On

Service Manual
29
5. No picture & Backlight on
No picture & Backlight on
Touch OSD Menu Button,
Does OSD display?
Is there R.G.B signal in
U401 #99, #96 #93?
Is there clock signal in
U401 #109?
Check DC 5.0V on
CN501#1, #2, #3
Are there data output on
U401#7~#16, #31~#40
Change U401
END
Change D301,
D302 & D303
Check Q501 circuit
YES
YES
YES
YES
YES
NO
NO
NO
Change X401
NO