The Power Is Not Turned On - Brother PR600 Service Manual

Failure Investigation for Electronic Parts The power is not turned on.
Is the inverter lead properly connected to
connector CN13 on the panel PCB and
connector CN1 on the inverter PCB?
Is the resistance between each pin at both ends
1 Ω or below when inverter leads are removed
from the panel PCB and the inverter PCB?
Does the machine function normally when the
inverter PCB is replaced with a reliable one?
Is the LCD's lead properly connected to
connector CN2 on the inverter PCB?
Is the FFC for the LCD properly connected to connector
CN1 on the panel PCB and the LCD's connector?
Does the machine function normally when the
FFC for the LCD is replaced with a reliable one?
Does the machine function normally when the
LCD module is replaced with a reliable one?
From the previous page
Y
Y
N
Y
Y
N
Y
Change LCD modules.
N
Change leads A and B on the panel.
N
Change inverter leads.
Y
Change inverter leads.
N
Connect it properly.
N
Connect it properly.
Y
Change FFC for the LCD.
N
Change panel PCB.
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