Is it giving an error code, or just glitching out? I just repaired my Samsung control board. It would glitch out (display goes nuts, relays clicking). I found that there was cracked solder joints on the main board relays. I resoldered them and it’s totally fixed now. I think the bad connection causes the relays to pulse which creates back-emf that glitches the display. Getting the board out of the potting compound is annoying and messy, but otherwise it was an easy fix.