Acer V173 Service Manual page 46

4. No Raster
No raster?
LED Blue?
Backlight can't
be turned on.
Is there 14Vdc
voltage on pin9
of IC501?
Is there high-level
voltage on pin8 of
IC501?
Are connected rightly
CN501, CN502,
CN503 and CN504?
Is there instantaneously
pulse wave on pin14,
pin11 of IC501 at the
moment of restart?
Is T501, T502 ok?
Check feedback circuit
Isen,Vsen.(pin 1.2)
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
Check power
supply
Is Ok R510?
No
No
No
Is Ok IC501?
No
45
Yes
Check I/F
board
R501 open
Connecting the
output connector
again
Yes
U501, U502 fail
IC501 fail
T501, T502 fail
END