CHECK AND TEST 1

Step 1

Unscrew cover of mainboard with cross-head screwdriver.

Step 2

Power on the appliance, and heat freezer temp. sensor.

Step 3

Use multimeter to test the voltage of output for fan.

Take note of the test result.

DIAGNOSIS 1


CHECK AND TEST 2

Step 1

Open fridge door and heat fridge temp. sensor.

Step 2

Press down fridge mechanical switch

Step 3

Attach detecting hook to wires after stripping sleeves, use an oscilloscope to measure signal for damper between “A+” & “B+” or “A-” & “B-”

Step 4

Power on the appliance and observe the signal for five seconds after opening or closing the door. Check to see if there is a square waveform output.

DIAGNOSIS 2


PROCEDURE 1


Step 1

Disconnect terminals.

Step 2

Unscrew the mainboard. 

Step 3

Pull out the buckle. 

Step 4

Remove the mainboard.

PROCEDURE 2


CHECK AND TEST 3

Step 1

Power on the appliance, open fridge door, and press down fridge mechanical switch.

Step 2

Put your hand near outlet of fridge air duct to feel if there is cooling air blowing out.

DIAGNOSIS 3


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