I don’t know if the problem is actually in the jack for sure. It just seems most likely. I plug in the external power supply and it bypasses the battery but the pedal goes dead, remove plug make sure there’s a good battery and we’re rocking. Therefore we are talking something requiring more information than I have since I would only remove the board to replace the jack. I can perform these simple tasks. Even though I’m comfortable with following directions I am by no stretch of the imagination an engineer. Therefore replacing the jack is a no harm done low cost most likely fix.

-Roy