LG LSE4613ST Service Manual page 67

CHECKING FLOW CHART BY FAILURE
3
Range Of resistance
Heater
Broil
Conv. Heater
Plug in the unit
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 any button, and encoder is
placed in the Off
2. Press the button in the following order
→ → _ → → Oven light
: +
(Oven Light hold for 3 seconds).
3. Press the OVEN LIGHT button again.
(hold for 3seconds)
4. Select the "t3" by press the + button
5. Press the START button
Normal : Thermistor value at room temp is from
70˚F to 90 F
˚
Ω
Resistance[ ]
Approximately
13.5
23
Yes
Yes
Go to No 6
No
Unplug the unit
5
Is the resistance of
thermistor normal?
Check:
Pins 4 and 5 of CN31 in main PCB
Normal- approximately 1.09kΩ at 25˚C
6
Replace the Relay PCB.
If the same phenomenon occurs even though
after replace Relay PCB, you should replace
the Main PCB
9-7
Replace the
No
defective
Thermistor
CN31
Yes