LG LSRG309ST Service Manual page 62

CHECKING FLOW CHART BY FAILURE
Oven too hot, F-6, F-16?
Yes
Power Off
1
Is the resistance of
thermistor normal?
Check:
Pins 1and 2 of CN5 wiring in main PCB
Normal- approximately 1.09kΩ ⁄ at 25˚C
Yes
Power Off
2
Is the Heater relay normal?
Measure the resistance of
heater relay and L.
Normal: infinite
Abnormal: continuity
L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1
L:TAB1 L:TAB1
L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1
L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1
No
Replace the
failed thermistor
CN5
Replace
No
the relay PCB
(EBR52349701)
Abnormal Normal
Continuity Infinite
1pin(CN10)
Broil(RY5) Relay
Resistance
10-13
L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1
L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1 L:TAB1
L:TAB1 L:TAB1 L:TAB1 L:TAB1
L:TAB1 L:TAB1 L:TAB1
Yes
Power On
3
Is the value of thermistor
normal?
Check: using the test mode
To enter the testmode,
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.
Yes
2pin(CN10)
Bakel(RY6) Relay
Resistance
Replace
No
the Main PCB
(EBR52349501)