Acer X223 Service Manual page 29

ACER X223W
28
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5.8 Checking the resolution change IC movement
Check +3.3V supply on I305 pin8,
pin14, pin16, pin24 , pin32, pin49,
Check +1.8V supply on I305 pin
Check X301 14.318MHz clock
input to I305 pin96 and pin97 at
Check I305 pin 84 HWRESET
signal is low level at normal
Check I305 pin37, pin38, pin39,
Failure Point
I306 failure.
5. Troubleshooting (continued)
pin56, pin75, pin98
NG
OK
51, 66, 82, 34.
NG
OK
TTL level.
NG
OK
operation.
NG
OK
pin40 SPI signal
(Same as the IIC signal).
NG
OK
Proceed " Checking the DC/DC converter circuit" section.
Proceed " Checking the DC/DC converter circuit" section.
Failure Point
1) Printed wire broke between X301 and I305 pin96, pin97.
2) C379, C380 is short or open.
3) X301 failure.
NG
Check if D328 pin1 is low.
Failure Point
1) Printer wire broke between I305 pin84 and C378.
OK
2) C381 is short.
3) R358, D328 is failure
4) I305 is failure
Failure Point
1) Printed wire broke between I305 pin37, pin38, pin39, pin40 and
I306 pin1, pin2, pin5, pin6.
2) I306 failure.
Failure Point
1) Printer wire broke between I305 pin84
and C378
2) C78 is short.