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5. Troubleshooting (continued)
5.3 Checking the back light unit
Is +22V supplied to inverter PWB ? (by the
power board)
NG
OK
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.
NG
OK
Failure Point
1)printed wire broke between P301 pin2, R304 and I308 pin 101.
2)I308 is failure.
Check the BKLT_ADJ signal of the input P301 pin3 from I308 pin102 is a PWM signal.
NG
OK
Failure Point
1)Back light unit of LCD module is failure.
2)Inverter Cable disconnect
Failure Point
1)printed wire broke between P301 pin3, R501 and I308 pin102.
