That voltage is correct coming out of the filter - no need to change that. It’s honestly pretty uncommon to see any burning on a faulty control. Here’s a basic suggestion anyhow: Do you hear a ‘click’ on the main control when you plug the unit in? There is a relay that basically holds that voltage ready and sends power to the display when you press the ‘power’ button. If that malfunctions - you will get no response when you press any button. If you don’t hear that holding relay ‘click’ - I would change the control. Especially if that board is receiving voltage from the filter. There is a always the possibility that the power button(display board) itself is not functioning - but much, much, less likely.