LG LSRG309ST Service Manual page 55

CHECKING FLOW CHART BY FAILURE
Range Of the resistance
Heater Min[Ω]
Broil Glowbar
Bake Glowbar
Gas Valve(Broil)
Gas Valve(Bake)
Yes
Power On
4
Is the value of thermistor
normal?
Check: using the test mode
To enter the test mode, follow these steps:
1. press the "CLEAR" key
2. press the "BAKE", "BROIL" key at the same
time
3. press the "BAKE", "BROIL" key at the same
time again.
4. press the NUM "3" key
Normal : the sensor value is from 70˚F to 90˚F at 25˚C.
No
Max [Ω]
45.0 400.0
45.0 400.0
1 1.5
1 1.5
Yes
Go to No 6
Power Off
5
Is the resistance of
thermistor normal?
Check:
Pins 1and 2 of CN5 wiring in main PCB
Normal - approximately 1.09kΩ at 25˚C
Yes
6
Replace the Relay PCB
(EBR52349701)
If it doesn't work even though changing the Relay PCB,
you should replace the Main PCB.
(EBR52349501)
10-6
No
Replace the
failed thermistor
CN5