Acer A221HQV Service Manual page 47

5.2.9 Checking the DC/DC converter circuit:
Check the 5V is output from
CN301 pin 9,10,11
Check the 5V is input to I301 pin3
Check the 3.3V is output
from I301 pin2
Check the 3.3V or 2.6V is
input to I302 pin3
Check the 1.2V is output
from I302 pin2
Failure Point
Printed wire broke between I302 pin2 and
L308 L310.
Printed wire broke between I301 pin2 and
L307 L309 L311
L307 L309 L311 L308 L310 open or C345
C346 C347 C350 C351 C352 C356 C357
C348 C349 C382 C353 C354 C355 short.
5. Troubleshooting (continued)
OK
NG
NG
OK
OK NG
OK NG
NG
OK
Failure Point
1) Power wire disconnection.
2) Power board is failure.
Failure Point
Printed wire broke between CN301
pin 9, 10, 11 and I301 pin3.
Failure Point
I301 is failure or C304 is short.
Failure Point
Printed wire broke between I301 pin2
and I302 pin3. Or both D313 and
L313 open or C307 short.
Failure Point
I302 failure or both C308 and C310
short..
ACER A211H/A221HQ 45
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