No Raster - Acer AL1706 Service Manual

No raster

YES
LED Green?
YES
Backlight can
not be turned on
YES
I
s there 12Vdc
voltage on pin13 of
IC501?
YES
Is there high-level
voltage on pin8 of
IC501
YES
Check CN501, CN502,
CN503 and CN504?
YES
Is there pulse waveform on pin1,
pin3, pin15 and pin16 of IC501 at the
moment of restart?
YES
Is ok T501, T502?
YES
Check protected
circuit Q501, Q502,
Q503, Q504
END
NO
NO
I
s Ok fuse F501?
NO
Is R526 Ok?
NO
NO
NO
Is Ok IC501?
NO
T501, T502 fail
34
F501 open
YES
YES
NO
Check power
supply
Check I/F board
R526 open
Connecting the
output connector
again
U501, U502 fail
IC501 fail