LG TD-C70040E Service Manual page 27

DIAGOSTIC TEST
11
Test 6 Thermister check
Trouble Symptom : Poor drying performance(over-drying or no drying). Abnormal
Measurement condition :
GN1(RD4) GN4(WH4)
4 3
1 2
Dryer
Temperature
10°C
20~30°C
30~40°C
thermistor operation.
With CN1(RED4), CN4(WH4) disconnected
from Controller, check
TH-Heater
CN4
data according to surrounding temperature?
4 3
1 2
TH-Drum
CN1
data according to surrounding temperature?
• When measuring "TH-Heater"
Thermistor, they range Table
data ?
• When measuring "TH-Drum "
Thermistor, they range Table
data ?
• Check Harness
Resistance
TH-Heater TH-Drum
19~111kΩ
250~180kΩ 11~8kΩ
180~113kΩ 8~5kΩ
- CN4 resistance ranges table
- CN1 resistance ranges table
NO
YES
YES
Resistance
Dryer
Temperature
TH1
40~50°C 113~75kΩ
50~60°C 75~50kΩ
60°C 50kΩ
26
• Check and replace
Controller
YES
• Replace "TH-Heater"
NO
Thermistor
• Replace "TH-Drum "
NO
Thermistor
Remark
TH2
5~4kΩ
4~2.5kΩ
2.5kΩ