Samsung RF28HMEDBSR Service Manual: If Fan Does Not Operate

French door refrigerator.
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TROUBLESHOOTING

4-2-2. If FAN does not operate

- The refrigerator of this model has BLDC FAN motor. BLDC motor is driven by DC 7~12V.
- On the normal condition of COMP ON, it operates together with F-FAN motor.
If door is opened and closed once at a high ambient temperature, it will be operated after 1 minute delay.
Therefore, you are advised not to taken it for an error.
-. If there is a trouble, you should select the self-diagnostic function to check the trouble before power off.
Is the voltage between MAIN
PCB Ground J23 JUMMPER and CN
76"5"(Sky -blue) around DC7~12V?
Is the external temperature
above 66.2℉(19℃ )?
Recheck after 7 minutes
(Time could be delayed
depending on the
temperatures. If the
temperature is lower, It
may not operate : about
59℉ (below 15℃)
Does DC7~12V alternate with
below DC 2V between MAIN PCB Ground J23
JUMMPER and CN76 "5"(Sky-blue)
F FAN pulse voltage
PCB Typical Ground
CN76 "7"(Brown)
J23 JUMMPER
The voltage measured around 2~3V
with multi-meter though the voltage is
very weak because of pulse signal
Display for checking the self-diagnostic function
R FAN ERROR
F FAN ERROR
(Option)
Is the voltage between MAIN
PCB Ground J23 JUMMPER and CN
76"4" (Orange) around DC7~12V?
Is the voltage between MAIN
PCB Ground J23 JUMPER and CN
76-"12"(Purple) around 0V?
Door & MICOM State
F MICOM
R MICOM(#28)
Door
(#29)
Right and Left
5V(High)
0V(Low)
Close
5V(High)
Open
0V(Low)
Does DC7~12V alternate with below
DC 2V between MAIN PCB Ground J23
JUMMPER and CN76 "4"(Orange)
Reference
CN76-7(F),8(R),9(C)will generate the pulse signal when motor rotates.
These signals will be inputted into MICOM.
Unless signals are not inputted during motor operating, will be ON 10
seconds after fan Off. But if signals are not still entered, the above
operation will restart four times more.
If signals are not entered continuously, the motor will be restarted after 10
Minutes. This function is effective when the normal operation of motor
would be restrained by foreign matters such as ice.
The voltage between PCB typical Ground J23 JUMMPER and
F FAN ; CN76 "3"(Yellow) shall be less than DC 7~12V.
R FAN ; CN76 "4"(Orange) shall be less than DC 7~12V.
C FAN ; CN76 "5"(Sky-blue) shall be less than DC 7~12V.
C FAN ERROR
- Recheck if resistance values are different after measuring.
Start
Is COMPRESSOR ON ?
Is the voltage between MAIN
PCB Ground J23 JUMMPER and CN 76
"3" (Yellow) around DC7~12V?
Is the voltage between MAIN
PCB Ground J23 JUMMPER and CN76-
"11" (White) around 4.5~5V?
Power ON with 7 minutes delay
after power OFF.
For preventing the over load of
compressor)
Does DC7~12V alternate with
below DC 2V between MAIN PCB Ground
J23 JUMMPER and CN76 "3"(Yellow)
1) F-FAN
2) R-FAN
86
Execute manual
operation
FAN work normally
Repair the connection
of Door switch
In initial power to appliance, the compressor
and fans of fresh food/ freezer, compressor
fan operate. If freezer temperature is sensed
of 41℉ by momentary power failure, fans will
operate after 7 minutes.
Replace MAIN PCB Ground
• Expected causes
Check that if FAN-MOTOR has failure itself.
Check that if wiring connection has bad contact.
Check the input of the fan motor rotation pulse
when motor fan operates.
PCB Typical Ground
J23 JUMMPER
3) C-FAN

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