N O Picture & Backlight - Dell E190Sf Service Manual

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