The original IC Controls products were pretty much bulletproof. However, the Chinese made ones were known to failure. You may not have a blown board but simply a burned trace on the ICB. Open it up and take a look.
If a trace is burned you can solder a piece of solid copper wire to remake the connection.
I have one of the original TPC 400 prototypes no with the original prototype instruction manual that were handmade by Lou Kovatch that I don’t use and may be interested in selling it. My e-mail is in my profile.
