The backlight does not go on.
NO
YES
NO
NO
YES
NO
YES
YES
Inside the power supply unit: Has the fuse
F705 1A on the inverter circuit burnt out?
Is power supplied to the INVERTER PWB?
(Vin, 3.5VAC)
Are PWBs properly connected with
harnesses?
(Power supply unit,
INVERTER PWB,
INVERTER-GND PWB, LCD
CONTROLLER PWB)
Connect properly or replace harnesses.
Check the inverter circuit behind the burnt
fuse.
Inside the power supply unit: Is each
control signal sent to CN70
4? (Pin (11) of
OFL1, pin (13) of INV.OSC)
Check the connectors of each fluorescent
lamp and inverter circuit.
Check IC4501 (LCD CONTROL) and its
peripheral circuits.
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