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 I304 pin2 if
voltage is 3.3V
OK
NG
Check if the voltage
between I301 pin2 and
pin3 is above -0.7V
OK
Failure Point
I301 is failure.
Check the P307 all LVDS signals.
Failure Point
1) Printed wire broke between P307 and
I308 LVDS signals.
2) I308 is failure.
OK
NG
Failure Point
1) The LVDS cable broke between P307
and LCD module.
2) LCD module is failure.
NG
Proceed "
Checking the DC/DC converter
circuit
" section.
NG
Check the I301 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 P309 pin1
Failure Point
1) Printed wire broke between P309 pin 1
and I308 pin 108.
Check if the voltage on I308 pin 108 that is
from 3.3V to 0V.
OK
NG
Failure Point
I308 is failure
OK
NG
25
Go to cover page
5. Troubleshooting (continued)
ACER H233H
