Acer AL2017 - No Raster

Acer Service Manual
2. No raster
No backlight
LED lamp is OK
Yes
No power supply to
inverter
No
Yes
No
Is there 16V voltage on
pin3,4 of T501,T502
U501, U502 fail No
Check power
supply
Replace U501,U502Yes
Yes
Is there PWM signal on
pin4 of IC501
No Check I/F BD
Yes
Is there High level voltage
on pin10 of IC501
No Check I/F BD
Vsense voltage is 2.9V
Yes
Yes
Lamp connector
opened
Are there PWM signal on pin1,
pin15 of IC501
No
No IC501 failure
Pin 5 of IC501 voltage is
Low level
Yes
Feedback circuit
failure
Yes Yes
Check C524,R528, R533,
D507
NO
Pin 3 of IC501 voltage is high
level voltage
Yes IC501 protected Yes
Check D505, D511,
D512, D513, R520, C520
END
Yes
Check the cable that from
I/F BD to P/I BD is ok
Yes
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