Samsung RT53 Service Manual page 49

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TROUBLESHOOTING
4-2-3. When Defrost does not work (F DEF Heater)
- When there is a trouble in defrosting, select the Self-Diagnosis function before turning off the unit. And,
check if there is any defect in the Defrost Heater. If not, plug out the unit and do the Trouble-Shooting. (Re
to the Self-Diagnosis function and check the details)
** Heater Resistance Reading Location **
F-DEF : Resistance between CN70 #5 (BRN)
CN77 #3 (ORG) should be ohm ± 10%.
** 0Ω : Short / ∞Ω : Open
(Bimetal / Thermal Fuse / Heater Defect)
** Sensor Resi s tance Readi n g Locati o n **
F-DEF : Between CN30 #4 (RED)
** 0Ω : Short / ∞Ω : Open
Temp vs. Resistance Table
30 ℃ 4.22
20 6.05
℃
10 ℃ 8.87
0 ℃ 13.29
-10 ℃ 20.42
-20 32.23
℃
-30 ℃ 52.41
** Sensor Voltage Reading Location **
F-DEF : Between PCB COMMON Ground
and CN30 #4 (or SEN_2)
** 0V : Short / 5V : Open
After pressing the Power Cool and
the Fridge buttons simultaneously for
6 seconds, push the Fridge button to
enter the Test Mode.
And then, when any one of t he buttons
is pressed twice, the Forced Defrost will
start and "3 ℃ , 5 ℃ and 7 ℃ " LEDs will
light up on the display panel.
Check the related sensors
if they are defective.
Note When the temperature of the F DEF Sensor
goes over 12 ℃ with the Defrost Heater heating up, it
stops heating and it goes back to Cooling Operation.
SEG Voltage
230
RT29/
RT32
120
230
RT35/
Hotpoint,Mba
4033 Cv
↔
CN76-"1" (GRY)
↔
㏀
㏀
For more
㏀
detail data,
㏀
refer to
㏀ DATA1. Temp
Table
㏀
㏀
No
After heating up for a while, it
goes back to Cooling Operation
Watt OHM
130 406.9
130 110.8
160 330 6
RELATED TITLES
LG_MULTI_F_3828A20097W_1[1]
Start
No
All Defrost Heaters
are normal?
Yes
Defrost Sensor is
No
normal? (Check it
with Self-Diagnosis)
Yes
The Sensor
No
Temperature Value
is lower than 12 ℃ .
Yes
Do Forced Defrost
Power is applied to
F-Defrost Heater.
No
Yes
Yes
Normal
MAIN PCB
No
Connection is normal?

Samsung 34648123
Refrigerador WD856UH
☞ When checking wit
F DEF. ERROR
the Self Diagnosis
Check Bimetal, Heater
Continuity or Wire Connection
Replace the Sensor
Forced Operation for a while