Acer AL1716 Manual de serviço - Página 23

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ACER AL1716W

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4.9 Checking the resolution change IC movement

1. Check +3V3 supplied on I306

pin2, pin25, pin53, pin47, pin74,

pin82, pin91, pin92, pin101. pin110,

pin116

2. Check +3V3 supplied on I309

pin8.

1. Check +1V8 supplied on I306

pin55, pin87, pin17, pin118, pin70,

pin78, pin104, pin106.

2. Check +1V8 supply on I305 pin46,

pin53, pin86, and pin122.

Check X301 14.318MHz clock input to I306

pin108 and pin109 at TTL level

Check I306 pin111 RSTB signal is high level at

normal operation.

1.Check I309 pin8, pin3, pin5, pin6.

2.Check I308 pin5, pin6, pin7, pin8.

Failure Point:

I306 is defected.

4. Troubleshooting (continued)

Proceed 'Checking the DC/DC converter circuit' section

Failure Point:

1. Printed wire broke between X301 and I306 pin108

and pin109

2. C362 or C373 may be short or open.

3. X301 is damaged.

Failure Point:

1. Printed wire broke between I306 pin111 and I307

pin2.

2. C375 is short.

3. I307 or I306, Q305 is damaged.

4. R349, R348 is open.

Failure Point:

1. Printed wire broke between I309 pin5, pin6 and

I306 pin61, pin62.

2. I306, I309 is defected.

3. R362,R364,R365,R366,R359,R360 or R361

is open.