5.1.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued:
5. Troubleshooting (continued)
Failure Point
1) The LVDS cable broke between
P307 and LCD module.
2) LCD module is failure.
Failure Point
I304 is failure.
Continue
Check the 5V power supply for
P301 pin 4,5,6.
OK
Check the I304 pin2
if voltage is 3.3V
OK
NG
Check if the voltage
between I304 pin2 and
pin3 is above -0.7V
OK
Check the P307 all LVDS signals.
OK
NG
NG
Proceed "Checking the DC/DC
converter circuit" section.
NG
Check the I304 pin2
if voltage is 5V
Failure Point
1) FB301 is open..
OK
Check the I305 pin2
if voltage is 1.2V
OK
NG
Proceed "Checking the DC/DC
converter circuit" section.
Check the input voltage level
whether was changed when
pressed function keys on the P308
pin1
Check if the voltage
on I308 pin 108 that
is from 3.3V to 0V.
OK
NG
OK
NG
Failure Point
Printed wire broke between P310
pin 1 and I308 pin 108.
Failure Point
I308 is failure
Failure Point
1) Printed wire broke between
P307 and I308 LVDS signals.
2) I308 is failure.
23
ACER A211H/A221HQ