Samsung RT38 Service Manual page 49

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 Fridge temp is lower than
12℃, it will be regarded as an instant
power failure, starting in 7 minutes.
Start
The Compressor is Off.
No
It reads DC7~12
between MAIN PCB
GND and CN76 #9.
No
Apply power in 7 minutes after
turning the motor off. (To prevent the
compressor from being overloaded)
Yes
Does it repeat DC7~12V (between MAIN Does it repeat DC7~12V (between MAIN
PCB GND and CN76 #9) and lower than PCB GND and CN76 #9) and lower than
DC 2V (between MAIN PCB GND and DC 2V (between MAIN PCB GND and
CN76 #6)? CN76 #6)?
Yes
◆ 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)
54
Yes
Run Forced Operation
Yes
FAN operates.
No
Replace MAIN PCB
No