LG LUTE4619SN Service Manual page 99

3
Is the DLB relay normal?
Measure the resistance
Normal: infinite
Abnormal : shorted
Upper DLB
Relay
Tab 13 and Tab 14 : RY7
Lower DLB
Relay
Tab 24 and Tab 25: RY13
Yes
TROuBLEShOOTING
No Replace the Relay PCB
8-20
4
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℉
Yes Replace the Main PCB