5. Troubleshooting (continued)
OK
OK
Failure Point
1) Printed wire between Q301 pin3,
R305, R306, I301 pin1 is failure..
2) Q301 is failure.
NG
OK
NG
OK
Failure Point
I301 is failure.
Failure Point
1) Printed wire broke between P304
and I305 LVDS signals.
2) I305 is failure.
OK
Failure Point
1) The LVDS cable broke between
P304 and LCD module.
2) LCD module is failure.
NG
Proceed "Checking the DC/DC
converter circuit" section.
NG
Failure Point
1) FB301 is open.
2) C309, C310 is short.
OK
OK
NG
Proceed "Checking the DC/DC
converter circuit" section.
Failure Point
Printed wire broke between P306
pin 4 and I305 pin 90.
OK
NG
Failure Point
I305 is failure
OK
NG
Continue
NG
Check the 5V power
supply for P304 pin 1, 2, 3
Check the I302 pin2
if voltage is 3.3V
Check if the voltage
between I301 pin2
and pin3 is above -
0.7V
Check if the Q301 pin2 of
PANELVCC_EN signal that
outputted by I305 pin85 is
High level.
Check the I301 pin2
if voltage is 5V
Check the D326 pin1
if voltage is 1.8V
Failure Point
1) Printer wire between R307
and I305 pin85 is failure
2) I305 is failure.
Check the P304 all
LVDS signals.
Check the input voltage level whether
was changed when pressed function
keys on the P306 pin 4 (normal is high
level, when push buttom, generated
1.6V)
Check if the voltage on
I305 pin 90 that is from
3.3V to 1.6V.
NG
5.2 Nothing display on screen (screen is black, color of LED is
blue) continued
Go to cover page
22
ACER X223W
