Checking The Back Light Unit - Mitsubishi E55LCD Service Manual

3. Checking the back light unit

Is 12V voltage provided to
inverter?
NG
OK
Is 12V-source voltage
provided to pins 1 and 2 of
CN1 in inverter module?
NG
OK
Check the ON/FF signal
of equal "H" at CN1 pin6?
NG
OK
Check Inverter F1 open.
NG
OK
Failure point
F1 failure. Replace the
inverter board.
Failure point
Check Power Board.
Failure point
Inverter cable disconnection.
1) µ-p failure.
2) Printed wire broke
between µ-p trace to CN1
pin6.
Failure point
1) Inverter cable disconnection.
6-6