Failed LG Main PCB Power Control Board

[jcotnoir]

Please make sure to click on General above and select the correct appliance type first.

Brand: LG
Range Model Number: LSEL6335F/00
Main Symptom: Days ago the front left, rear left and warmer burners stopped being operational.

What happens & when: When I turn on the knobs (left front, left rear and warmer) The indicator lights illuminate and all of the relays on the power Pcb activate. The burners never illuminate red or produce heat.

Error Code (if any): None
Parts or tests already tried: Reset circuit breaker, checked connection states CN10 of main PCB and CN02 Power PCB, all wires going from PCB have adequate continutity.
Photos / video link:

[Jeffrey_S_APP_Team]

@jcotnoir

LSEL6335F/00

You have a stuck Relay on your Relay and SMPS PCB ( LG EBR31737803 Electric Range Power Control Board Assembly | Genuine OEM Part )

I have included the wiring diagram that shows the power route from the relay to the 3 left side eyes. Forgive my terrible highlighting

[jcotnoir]

The relay is working.

[Jeffrey_S_APP_Team]

the blue line traces the surface on indicator path not the path for burner power. Are you getting 120vac out of the relay with the black wire disconnected

[jcotnoir]

Yes, we are getting 120 going through black and 120 going out to the yellow when energized.

[Jeffrey_S_APP_Team]

OK is that with the wire to the burner unplugged. If so turn one of the burner knobs on and read the voltage on the black wire without connecting it