LG TD-C70070E - Thermistor Performance Diagnostics

25
DIAGOSTIC TEST
10
Test 6 Thermister check
Trouble Symptom : Poor drying performance(over-drying or no drying). Abnormal
thermistor operation.
Measurement condition : Power cord is unplugged.
• When measuring resitance of
Heater thermistor.
It range table data.
NORMAL
ABNORMAL
NORMAL
NO
⇨⇨
YES
• When measuring resitance of
Low temperature thermistor.
It range table data.
• Check Harness
⇨⇨
YES
⇨
NO
⇨
Dryer
Temperature
Resistance
TH-Heater TH1 TH2TH-Drum
Dryer
Temperature
Resistance
Remark
10°C
↓
20~30°C
30~40°C
40~50°C
50~60°C
60°C
↑
250~180kΩ
180~113kΩ
113~75kΩ
75~50kΩ
50kΩ↓
5~4kΩ
4~2.5kΩ
2.5kΩ↓
19~111kΩ
11~8kΩ
8~5kΩ
4 3
2
RD4 WH8
1
1 2 3 4
5 6 7 8
With RED 4 , WHITE 8 disconnected from
Controller, check
1) High temperature thermistor ( Wire color :
Blue ) White 8 pin ③ - White 8 pin ④
resistance ranges table data according to
surrounding temperature.
2) Low temperature thermistor ( Wire color :
Blue ) Red 4 pin ② - Red 4 pin ④
resistance ranges table data according to
surrounding temperature.
• Check and replace
Controller.
1) Check disconnected
Housing or severed
Wire.
2) Check the
resistance of
thermistor.
3) Replace controller
and then recheck,
if anything else
occurs.
• Replace the thermistor
of heater.
• Replace the low
temperature thermistor.