Hello my name is XXXXX XXXXX you for choosing our service.
Do you have contant voltage to the control board?
Yes, a steady 120v where the power leads come in.
If you unplug the inverter does the relay board do the same thing?
I unplugged the inverter, relays on the board still click, but no display.
I have no idea of the board internals , all we as servicers do it just oder it and install it ,never rebuild them , I will optout thinking someone else can assist you .
Thanks nonetheless. It may also be worth nothing that I have no interior lights.