Acer G225HQ Service Manual page 55

6 Audio Function:
Was Audio Input
Plug Audio input. No
Check MCU send
VOL_ON control No Check VOL_ON
signal or not.
Adjust volume
control switch to No Check VOL_ADJ
normal.
Plug CN551 No
Plug Speaker. No
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Audio do not work
Yes
plugged?
Yes
Yes
Yes
Was CN551
plugged?
Yes
Was Speaker
plugged?
Yes
Replace IC551.
Was Audio V
DD
existed?
No
Return Power
Function Step.