Acer RA19WAANU Service Manual page 22

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.
OK
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)
OK
Check the P305 all LVDS signals.
OK
Failure Point
1) The LVDS cable broke between P305
and LCD module.
2) LCD module is failure.
5. Troubleshooting (continued)
NG
Check the I301 pin2 if
voltage is 3.3V
OK
Check the I309 pin2 if
voltage is 1.8V
OK
Check the I307 pin2 if
voltage is 5V
OK
Check if the voltage
between I307 pin2 and
pin3 is above -0.7V
OK
Failure Point
I307 is failure.
NG
Failure Point
NG 1) Printed wire broke between P305 and
I305 LVDS signals.
2) I305 is failure.
Proceed "Checking the DC/DC converter
NG
Proceed "Checking the DC/DC converter
NG
Failure Point
NG
1) FB312 is open.
2) C353, C355 is short.
Check if the Q311 pin2 of
PANEL Power_ON/OFF
NG
signal that outputted by I305
pin10 is High level.
OK
Failure Point
1) Printed wire between R311 pin3, R410,
R412, I307 pin1 is failure..
2) Q311 is failure.
Check if the voltage on I305 pin 20 that is
from 3.3V to 0.7V.
OK
Failure Point
I305 is failure
ACER X193HQ
Go to cover page
circuit" section.
circuit" section.
Failure Point
NG
1) Printer wire between R411
and I305 pin10 is failure
2) I305 is failure.
3) R413,C366 is short
Failure Point
NG
1) Printed wire broke between P304 pin 5
and I305 pin 20.
21