Acer AL1712 Service Manual page 28

2. No Characters , Missing one color
No
Change Power Board
3. No Audio
Check Inverter From
Power board OK ?
No
Check or Change
Cable Or Panel
No
Change VGA Cable
No
Check Input source
Or Change CN7
No
Change U8 or Q9 or U5
No Characters
Missing one color
No
Check CN2
12Vdc Output
OK
Check L6
No
5Vdc Output
OK
Check U1(pin2)
No
2.5Vdc Output
OK
Check U7(pin2)
No
3.3Vdc Output
OK
Check CN1 to Panel
Signal Output
OK
No
Check X'Tal
14.318 Mhz ?
OK
Check H , V
SYNC ?
OK
Change U2
No Audio
Check Input Signal
CN7 OK ?
OK
No
Check CN5 to Speaker
OK ?
OK
Check U8(Pin6)Volume
& Q9 & U5 OK ?
OK
No
Check U8Pin12(Mute)
& Q8 & U5 OK ?
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Change Power Board
Check or Change
U6 , Q6 , D1
Check or Change
U1
Check or Change
U7
Change X1
Change Speaker or
CN5(Cable)
Change U8 or Q8 or U5