5.2Nothing display on screen (screen is black, color of LED is blue)continued
Continue
Checkthe 5V power supply for
P301pin 4,5,6.
OK
Checkthe I304 pin2 if
voltageis 3.3V
OK
NG
Checkif the voltage
betweenI301 pin2 and
pin3is above -0.7V
OK
FailurePoint
I301is failure.
Checkthe P307 all LVDS signals.
FailurePoin t
1)Printed wire bro ke between P307 and
I308LVDS signals.
2)I308 isfailure.
OK
NG
FailurePoin t
1)The LVDS cable broke between P307
andLCD module.
2)LCD module is failure.
NG
Proceed"Checking the DC /DC converter
circuit"section.
NG
Checkthe I301 pin2 if
voltageis 5V
FailurePoint
1)FB301 is open..
OK
Checkthe I305 pin2 if
voltageis 1.2V
OK
NG Proceed"Checking the DC /DC converter
circuit"section.
Checkthe input voltage level whether was changed when
pressedfunction keys on the P309 pin1
FailurePoin t
1)Printed wire broke between P309 pin 1
andI308 pin 108.
Checkif the voltage on I308 pin 108 that is
from3.3 V to 0V.
OK
NG
FailurePoin t
I308is failure
OK
NG
25
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5.Troubleshooting (continued)
ACERH233H