No Raster - Acer AL2017 Service Manual

Acer

2. No raster

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