LG LRFD25850SB Service Manual page 29

3. Open Door Detection Circuit Check
8-2-3 Temperature Sensor Circuit
Measurement
Location
Freezer/
Refrigerator Door
Closed
Open
TEMPERATURE
- 20 ˚C (-4 °F)
- 15 ˚C (5 °F)
- 10 ˚C (14 °F)
- 5 ˚C (23 °F)
0 ˚C (32 °F)
+ 5 ˚C (41 °F)
+ 10 ˚C (50 °F)
+ 15 ˚C (59 °F)
+ 20 ˚C (68 °F)
+ 25 ˚C (77 °F)
+ 30 ˚C (86 °F)
+ 40 ˚C (104 °F)
+ 50 ˚C (122 °F)
• The resistance of the SENSOR has a ±5% common difference.
• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature.
This delay is necessary due to sensor response speed.
Pin 4 & 5 of con4 Ref.Door
Pin 5 & 6 of con5 Fre.Door
0 V
5 V
RESISTANCE OF FREEZER
SENSOR
22.3 K
16.9 K
13.0 K
10.1 K
7.8 K
6.2 K
4.9 K
3.9 K
3.1 K
2.5 K
2.0 K
1.4 K
0.8 K
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RESISTANCE OF REFRIGERATOR &
DEFROST SENSOR & ROOM SENSOR
77 K
60 K
47.3 K
38.4 K
30 K
24.1 K
19.5 K
15.9 K
13 K
11 K
8.9 K
6.2 K
4.3 K