4-2-2) When The Freezer Fan Does Not Operate (Bldc Motor) - Samsung RB31FEJNB Series Service Manual

4. TROUBLESHOOTING

4-2-2) When the Freezer Fan does not operate (BLDC Motor)

- This refrigerator uses the BLDC Fan Motor.
The BLDC Motor operates with DC 7~12V.
- The F-Fan motor generally runs together with the compressor.
☞ When checking with the Self Diagnosis
F FAN ERROR
Upon the initial power on, the compressor
and the F-Fan operate.
And, when the Freezer temp is lower than
10℃, it will be regarded as an instant
power failure, starting in 7 minutes.
Start
The Compressor is Off.
It reads DC7~12 between
MAIN PCB GND and CN76 #9?
Apply power in 7 minutes after
turning the motor off.
(To prevent the compressor from
being overloaded)
Does it read DC7~12V
(between MAIN PCB GND and CN76 #9)
and lower than DC 2V
(between MAIN PCB GND and
CN76 #6)?
◆ Possible Causes
① Defective FAN-MOTOR
② Contact problem at the terminal
(MAIN PCB CONNECTOR-TERMINAL (CN76. ⑥,⑨,
⑩), Contact problem at Freezer Fan Motor Connector,
Defective Motor Wire)
③ Check the motor rotating pulse input upon Fan Motor
operation. (Refer to Fan-Motor Circuit in this manual)
Yes
No
Yes
No
Yes
No
Yes
65
Run Forced Operation
FAN operates.
Replace MAIN PCB
No