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Acer AL732 Service Manual page 18

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No Sound
Check Audio
Input ?
YES
U19 Pin1
12V?
YES
Check
U19
?
Pin23/24
YES
U18 Pin4
Vcc ?
YES
Check U18
Pin15/28 ?
YES
Speaker ?
YES
OK !
Check
NO
Audio Source
NO
Check
Power Supply
NO
Check
U19
NO
Change
Power Supply
NO
Check
U18
NO
Change
Speaker Cable
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