Acer RA19WAANU Service Manual download pdf (Page 22)

5. Troubleshooting (continued)

5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued

Continue

Check the 5V power supply for

P305 pin 1,2,3.

Check the I301 pin2 if

voltage is 3.3V

Failure Point

1) Printed wire between R311 pin3, R410,

R412, I307 pin1 is failure..

2) Q311 is failure.

Check if the voltage

between I307 pin2 and

pin3 is above -0.7V

Check if the Q311 pin2 of

PANEL Power_ON/OFF

signal that outputted by I305

pin10 is High level.

Failure Point

1) Printer wire between R411

and I305 pin10 is failure

2) I305 is failure.

3) R413,C366 is short

Failure Point

I307 is failure.

Check the P305 all LVDS signals.

Failure Point

1) Printed wire broke between P305 and

I305 LVDS signals.

2) I305 is failure.

Failure Point

1) The LVDS cable broke between P305

and LCD module.

2) LCD module is failure.

Proceed "Checking the DC/DC converter

circuit" section.

Check the I307 pin2 if

voltage is 5V

Failure Point

1) FB312 is open.

2) C353, C355 is short.

Check the I309 pin2 if

voltage is 1.8V

Proceed "Checking the DC/DC converter

circuit" section.

Check the input voltage level whether was changed when

pressed function keys on the P304 pin 5 (normal is high level,

when push buttom, generated 2.2V/1.9V/0.7V)

Failure Point

1) Printed wire broke between P304 pin 5

and I305 pin 20.

Check if the voltage on I305 pin 20 that is

from 3.3V to 0.7V.

Failure Point

I305 is failure

Go to cover page

ACER X193HQ

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Acer RA19WAANU Service Manual Page 22

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