SERVICE MANUAL MR-G57N-T-NZ - B.d.t.

Freezer compartment
[2]
Compressor does not operate
[3]
Filter board
CN1 CN12
Noise filter
Poor cooling
1 Is the set temperature of freezer compartment set to “High”?
Yes
2
3
Does cool air come out of air outlet when opening the refrigerator
compartment door and attaching a magnet bar on the door switch ?
Yes
Check freezer compartment thermistor.
Dip freezer compartment thermistor into ice water (0 ), and
measure the resistance between terminal (white) and
(white) by detaching 4-pin connector at the left-back bottom of
vegetable compartment.
•Resistance at 0 :approx. 6~7k .
Defective thermistor
Replace freezer compartment thermistor
Not cooling at all (In case any error codes doesn’t appear as shown in page 29,30 even though Ice select switch is pressed for 5 seconds)
Does AC 230V run between and , terminals
of CN1 on filter board?
Yes
Does AC 230V run between and , terminals
of CN12 on filter board?
Yes
Detach each connector CN2A on
control board check the continuity
between terminals and
respectively.
(Check if there is a short or open
circuit in the motor protector.)
Continuity detected
Detach connector CN50G on control
board and check the resistance
respectively between terminals of
, and :approx. 9.3
Continuity detected
Check the error display of selfcheck
after turning on and off the
power supply.
With all the connectors connected.
Inverter-related parts may be
defective. Conduct ice making
test operation. (See page 29,30
for error codes.)
No
continuity
No
No
Control board
6-pin connector in machine chamber
CN2A CN50G
Control board
28
No
No
Normal
CN7S
Abnormal
Set the temperature to “High”.
Proceed to “The refrigerator fan motor does not work.”
When compressor
operates, display
indicates E41 as a
result of self-check.
M
Compressor
M Motor
protector
Normal
Abnormal
Normal
4-pin connector
Yes
Is refrigerator in the demonstration mode? Release the demonstration mode. (See page 11.)
No
No
continuity
Inspect power-supply wiring such as power cord and
breaker etc.
Replace the filter board.
Motor protector (open circuit)
By measuring the resistance,
ensure that the circuit is open.
Disconnect 6-pin connector
in machine chamber to check
resistance between terminals of
, and : approx. 9.3
Abnormal
Measure the resistance of compressor’s
winding between terminals
of black, white, and red :
approx. 9.3
Check connector contact.
Exchange the unit
Replace solenoid
valve coil.
Freezer
compartment
thermistor
Replace the lead wire
assembly (Lead wire of
compressor)