Acer NA23WABAS Service Manual page 30

5.2 Nothing display on screen (screen is black, color of LED is blue)continued
Continue
Check the 5V power supply for
P301 pin 4,5,6.
OK
Check the input voltage level whether was changed when
pressed function keys on the P306 pin1
OK
Check the P304 all LVDS signals.
OK
Failure Point
1) The LVDS cable broke between P306
and LCD module.
2) LCD module is failure.
5. Troubleshooting (continued)
NG
Check the I302 pin2 if
voltage is 3.3V
OK
Check the I310 pin2 if
voltage is 1.8V
OK
Check the I301 pin2 if
voltage is 5V
OK
Check if the voltage
between I301 pin2 and
pin3 is above -0.7V
OK
Failure Point
I301 is failure.
NG
Failure Point
NG
1) Printed wire broke between P304 and
I307 LVDS signals.
2) I307 is failure.
Proceed "Checking the DC/DC converter
NG
Proceed "Checking the DC/DC converter
NG
Failure Point
NG
1) FB303 is open.
2) C309 is short.
Check if the Q301 pin2 of
PANEL_EN signal that
NG
outputted by I307 pin67 is
High level.
OK
Failure Point
1) Printed wire between R307 ,R306,
I301 pin1 is failure..
2) Q301 is failure.
Check if the voltage on I307 pin 28 that is
from 3.3V to 0V.
OK
Failure Point
I307 is failure
ACER V233H
Go to cover page
circuit" section.
circuit" section.
Failure Point
NG
1) Printer wire between R307
and I307 pin67 is failure
2) I307 is failure.
Failure Point
NG
1) Printed wire broke between P306 pin 1
and I307 pin 28.
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