Acer wistron rb23wabas Manual De Usuario

Is +22V supplied to inverter PWB ? (by the

power board)

Failure Point

1) Power board of Inverter part failure.

Check the BKLT_EN signal of the DC input

P301 pin 2 at TTL high level.

Failure Point

1) printed wire broke between P301 pin2,

R303 and I307 pin 124.

2) I307 is failure.

Check the BKLT_ADJ signal of the input

P301 pin3 from I307 pin117 is a PWM

signal.

Failure Point

1) printed wire broke between P301 pin3,

R301 and I307 pin117.

Failure Point

1) Back light unit of LCD module is failure.
2) Inverter Cable disconnect

5.3 Checking the back light unit

5. Troubleshooting (continued)

ACER V233H