Acer NA23WABAS Service Manual page 39

38 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 I302 pin3.
OK
Check the 3.3V is output from I302 pin2, 4.
OK
Check the 3.3V is input to I310 pin3.
OK
Check the 1.8V is output from I310 pin2,4.
OK
Failure Point
1) Printed wire broke between I302 pin2,4 and I310
pin3.
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 I302 pin3.
Failure Point
NG
I302 is failure or C314 short.
Failure Point
NG
1) Printed wire broke between I302 pin2. 4 and
I310 pin3.
Failure Point
NG
I310 failure or C443 short.