Acer A221HQV - Page 46

5. Troubleshooting (continued)
5.2.8 Checking the resolution change IC movement:
OK
NG
Proceed " Checking the DC/DC converter
circuit" section.
OK
NG
Proceed " Checking the DC/DC converter
circuit" section.
OK
NG
Failure Point
1) Printed wire broke between X301 and I310
pin 127, 128.
2) C360, C361 is short or open.
3) X301 is failure.
OK
NG
Failure Point
1) Check I310 pin125 is from high to low level, it
is 3~10ms high level, when VCC5V is turned
on.
2) Printed wire broke between I310 pin 125 and
C362/R376.
3) R376 is short or open..
4) I310 failure.
OK
NG
Failure Point
1) Printed wire broke between I310 pin 115~118
and I307.
2) I311 failure.
Failure Point
I310 failure.
Check +3.3V supply on I310 pin 49, 84,
106, 62, 1
Check +1.2V supply on I310 pin 60,
73, 120. 23
Check X301 14.318MHz clock input to
I310 pin 127 and 128
Check I310 pin 125 RESET signal is
high level at normal operation.
Check I310 pin 115~118 SPI Flash
ROM interface signal.
44
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ACER A211H/A221HQ