Checking The Back Light Unit - NEC MultiSync LCD1550V Service Manual

3. Checking the back light unit

Is 12V-source voltage provided
to pins 1 and 2 of P804 in SW
REG board?
NG
OK
Is 12V-source voltage provided
to pins 1 and 2 of J901 in
inverter board?
NG
Inverter cable disconnection.
OK
Check the ON/FF signal of equal "H" at J901 pin3?
NG
OK
Check F901 open
NG
OK
Failure point
F901 failure. Replace the
inverter board
NG
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Failure point
Error in SW REG board.
Failure point
1) u-p failure
2) printed wire broke between u-p trace to P804 pin3
Failure point
1) Inverter cable disconnection.
2) C915, C955 open
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