Acer NA23WABAS Service Manual page 51

50 ACER V233H
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5.11 Checking the DC/DC converter circuit
5. Troubleshooting (continued)
Check the 5V is output from P301 pin 4,5,6.
OK
Check the 5V is input to I301 pin3.
OK
Check the 3.3V is output from I301 pin2, 4.
OK
Check the 3.3V is input to I305 pin3.
OK
Check the 1.2V is output from I305 pin2,4.
OK
Failure Point
1) Printed wire broke between I301 pin2,4,I305
pin3,2,4.
2) FB301,FB302 is open.
Failure Point
NG
1) Power wire disconnection.
2) Power board is failure.
NG
Failure Point
1) Printed wire broke between P301 pin 4,5,6
and I301 pin3.
Failure Point
NG
I301 is failure or C308 short.
Failure Point
NG
1) Printed wire broke between I301 pin2. 4 and
I305 pin3.
Failure Point
NG
I305 failure or C315 short.