Acer X223 Servicehandleiding - Pagina 24
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5.3 Checking the back light unit
5. Troubleshooting (continued)
Is +22V supplied to inverter PWB ?
(by the power board)
NG
OK
Check the BKLT_EN signal
of the DC input P301 pin2 at
TTL high level.
NG
OK
Check the BKLT_ADJ signal
of the input P301 pin3 from
I305 pin86 is a PWM signal.
NG
OK
Failure Point
1) Back light unit of LCD module is
failure.
2) Inverter Cable is disconnected
Failure Point
Power board of Inverter part failure.
Failure Point
1) printed wire broke between P301
pin2, R303 and I305 pin 88.
2) I305 is failure.
Failure Point
1) printed wire broke between P301
pin3, R301 and I305 pin86.
2) I305 is failure.
23
ACER X223W
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