Checking The Back Light Unit - NEC MultiSync LCD1550V Service Manual
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Also See for MultiSync LCD1550V:
- Service manual (101 pages) ,
- User manual (48 pages) ,
- Dimensional drawing (1 page)
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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
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
Error in SW REG board.
Failure point
Inverter cable disconnection.
1) u-p failure
2) printed wire broke between u-p trace to P804 pin3
1) Inverter cable disconnection.
2) C915, C955 open
Failure point
Failure point
6-6
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