Is+22V supplied to i nverter PWB ? (by the
powerboard)
OK
NG
FailurePoint
1)Power board of Inverter part failure.
Checkthe BKLT_EN signal of the DC i nput
P301pin 2 at TTL high level.
OK
NG
FailurePoint
1)printed wire broke between P 301 pin2,
R304and I308 pin 101.
2)I308 is failure.
Checkthe BKLT_ADJ signal oftheinput
P301pin3 from I308 pin102 is a PWM
signal.
OK
NG
FailurePoint
1)printed wire broke between P 301 pin3,
R501and I308 pin102.
FailurePoint
1)Back light unit of LCD module is failure .
2)Inverter Cable disconnect
5.3Checking the back light unit
Go to cover page
26 5.Troubleshooting (continued)
ACERH233H