Trouble Shooting - Acer H15AAX Service Manual

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Check the 3.3 V power are supplied on I308 pin 2.
Is a dot clock being outputted under the
condition that a LCD module is connected to
P303 pin 44?
Check the H-sync pulse of negative polarity is
output on P303 pin 38 at TTL level.
Check the V-sync of negative polarity are
output on P303 pin 40.
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Trouble Shooting

Check if the voltage on I308 pin3 that
NG
is high level DC at 5V.
OK
OK
Failure point
I308 Failure
NG
OK
NG
OK
NG
OK
Failure point
NG
1) Printed wire broke between P301 and I308
Failure point
1) I300 failure
2) Printed wire broke between I302 and P303 pin 44.
Failure point
1) I300 failure
2) Printed wire broke between I300 and P303 pin 38.
Failure point
1) I300 failure
2) Printed wire broke between I300 and P303 pin 40.
H15AAX (AL502)
Page 3