LG LUTE4619SN Service Manual page 88

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 Upper or Lower CLEAR/OFF key.
(2) Press the button in the following order
: + → － → START/Oven Light(START/
Oven Light hold for 3 seconds)
(3) Press the START/Oven Light button again.
(4) Select the "t3" by press the + button and press the START/Oven Light button.
Current Oven
Temp
Normal: Thermistor value at room temp is from 70℉ to 90℉
No
TROuBLEShOOTING
Go to No 5
Yes
8-9
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)
CN61
No
5
Replace the Relay PCB
If the unit does NOT work even though the
Relay PCB is changed,
you should replace the Main PCB
Replace the defective
Yes
Thermistor
CN60