Yamaha Clavinova CLP-250 Amplifier Board
The sound on my Yamaha Clavinonva CLP-250 cuts in/out pretty randomly.
It goes from no volume, then a loud transient spike, then sometimes works normally
for awhile before it cuts out again.
By pressing down on the various electronic components, I've traced the issue to the
amplifier board (PU 2066 XE766). It doesn't appear to be a ground issue - the amplifier
heat sink, which seems to be where much of the circuit is grounded, is well connected
to the metal foil (?) plane where everything grounds (amplifier board, speakers, transformer, etc).
However, when the sound cuts off, I can make it return by pressing down on the amplifier board.
Basically, I'm slightly deforming the board, suggesting a bad solder (though I can see nothing
Yamaha does not appear to have any parts or info for this model, hence I am close to throwing it out (which I hate to do since the keyboard is so nice).
Just wondering if anyone has a suggestion I could try to fix this issue and salvage the piano.