Look carefully for either a loose connection, or a stray wire causing a short circuit. Check your own manual connections first.?
Reminds me that years ago my vintage tube receiver stopped working. I used a wooden stick because of the high voltage, poking around to find a capacitor that came loose. Here it's much much less likely something came loose on the circuit board.?
Check coax connection to the board, and power wiring. Suggestion is to troubleshoot without DC power but use an ohmmeter to verify connections.?
Curt
