I have a Yamaha CVP55 clavinova. The unit powers up and will play a couple of notes, then nothing. If you switch the unit off and keep trying (usually more than a hundred times) then it will start working but only in piano mode. If you press any other button you're back to square one. Please help!
I have the same problem, have you found any solutions since 2014? :))
I think that could be some failed capacitors on motherboard or supplyboard... (sorry for my english, I'm french^^)
thanks
Etienne
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Try fixfault.com to fix pianos.