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The inverter board converts AC to a high DC voltage to power the drive motor. It also receives a lower
DC communication voltage from the main board which will make the motor rotate back and forth for
agitation, or ramp up to a high speed spin. The inverter board is enclosed in a protective housing and
cover located inside the cabinet, at the bottom left of the washer cabinet.
Inverter Diagnosing
The inverter receives 120 VAC from the main board at the J506 connector Pin 2
white
wire to pin 3
black
wire. It then converts the 120 VAC to a variation DC voltage that goes out to the motor.
CAUTION: DO NOT test the output DC voltage from the inverter to the motor!!
The best practice
would be to read the resistance between any two wires that connect to the stator. This should read
approximately 14.2
W (
ohms) for a single phase. If proper resistance is found and the inverter has 120
VAC at the P101 connector, replace the inverter.
The inverter also receives commands from the main board at the P232 connector. The voltage here is
12 VDC.
Inverter Board Removal
1. Remove the back cover (see
Back Cover
in the
Cabinet and Structure
section of this service
guide).
2. Remove the three Phillips-head screws that attach the main board to the rear of the cabinet.
NOTE
: Because of the tightness of the harness, it might help to remove the main board screws as well
as the inverter mounting screws to assist with the inverter board removal.
3. Lift up the main board box to unhook it from the rear of the cabinet.
4. Disconnect the harness from the inverter board.
5. Unclip four clips that secure the board access cover to the inverter board.
6. Disconnect the remaining harness connectors
J506
J502
J401
J301
J101
J101
M101
Main Board
Inverter Board
Inverter Board