What was that incompatible PSU you are talking about? Had it the wrong polarity? Too much voltage?
According to this post:
“Init error -2” = Error: could not read from THS7353
So there seems to be a problem with the video amplifier IC… or at least with the communication with it. Could be a damaged regulator (TLV70033/U6) or the IC (U17) itself – but that’s just an amateur guessing.