Acer X223W - 22" Widescreen LCD Monitor Service-Handbuch - Seite 29

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ACER X223W

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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

51, 66, 82, 34.

TTL level.

operation.

pin40 SPI signal

(Same as the IIC signal).

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.

Check if D328 pin1 is low.

Failure Point

1) Printer wire broke between I305 pin84 and C378.

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.