LG LDE4415ST Service Manual page 71

Range Of resistance
Resistance[Ω]
Heater
Approximately
Upper Broil 19
Upper Bake 24
Conv. Heater 23
Lower Broil 14.7
Yes
Plug in the unit
3
Is the value of thermistor
normal? (Refer below)
Check with the test mode To
enter the test mode, follow
these steps:
(1) press the "CLEAR" button
(2) press the upper BAKE and SPEED BROIL
buttons at the same time
(3) press the upper "BAKE",
"SPEED BROIL" button at the same time again.
(4) press the NUM "3" button
Normal: Thermistor value at room temp is from 70℉
to 90℉
No
TROUBLESHOOTING
Yes Go to No 5
Current Oven
Temp
Unplug the unit
4
Is the resistance of
thermistor normal?
Check:
Pins 4 and 5 of CN60 and pins 5 and 6 of
CN61 in main PCB
Normal- approximately 1.09kΩ at 75ºF(25ºC)
Yes
5
Replace the Relay PCB
If the unit does NOT work even though the
Relay PCB is changed,
you should replace the Main PCB
7-8
Replace the
No
defective
Thermistor
CN61
CN60