Led Lamp Does Not Light - Brother CE-5500PRW Service Manual

Failure Investigation
for Electronic Parts
Are the operation PCB assy. and LED
lamp assy. connected correctly?
In case of models equipped with the
LCD back light, is the LCD (back light
PCB assy.) lead wire connected to
the operation PCB assy. correctly?
Are the main PCB assy. and the operation
PCB assy. connected correctly?
Is the voltage between pin 4 and 3 at
the
connector 30V DC?
5 - 18

LED lamp does not light

LED lamp does not light.
Y
Y
Y
power supply PCB
Y
Replace the LED lamp assy.
or
Replace the operation PCB assy.
or
Replace the main PCB assy.
N
N
N
N
Replace the power supply
assy.
PCB assy.
Connect it correctly.
Connect it correctly.
Connect it correctly.