LG LSE3090ST Service Manual page 65

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
Power Off
2
Is the Heater relay normal?
Measure the resistance of
heater relay and L.
Normal: infinite
Abnormal: continuity
TAB2
L1:RD Wire
Replace the
No
failed
thermistor
CN5
Yes
Replace the
No
relay PCB
(EBR60938303)
Normal Abnormal
Broil(RY5) Relay
Resistance
Bake(RY5) Relay
Resistance
Yes
Power Off
3
Is the DLB relay normal?
Measure the resistance
Normal : infinite
Abnormal : continuity
9-12
TAB3
Replace the
No
relay PCB
(EBR60938303)
Normal Abnormal
Yes