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Main Board
The main board delivers the operating voltage to
all components except the back light LEDs. In
order for the main board to operate the cooling
components, it must receive a signal voltage
of 2.5 to 5 VDC from the FF temperature board.
This voltage range informs the main board of the
cooling setting selected by the consumer (see FF
Temperature Board in the Refrigerator section
of this service guide). Without the presence of
the necessary signal voltage, the interior lights
will be the only operating components.
Main Board Diagnosing
Main Board:
J11 (brown) to J7 pin 9 (orange): 120 VAC
J4 pin 3 (blue) to J1 pin 7 (red/white):*
Refrigerator set to Coldest setting: ~ 4.6 VDC
Refrigerator set to Colder setting: ~ 3.3 VDC
Refrigerator set to Cold setting: ~ 2.5 VDC
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*If the main board does not receive any
voltage from the FF temperature board the
compressor and fans will not operate.
Main Board Removal
1. Disconnect power to the refrigerator.
2. Access the rear of the refrigerator.
3. Remove nine 1/4 in. hex head screws.
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5. Disconnect the wiring connectors attached to
the board.
6. Squeeze each of the four retaining pins while
pulling that corner of the board to remove the
board from the enclosure.
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