Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Please tell me your local zip code... there might be someone (if not Yamaha Authorized) near your location that could help you with the CLP-150.
Or, were you thinking of fixing it yourself? if so, have you obtained a Service Manual or Repair Manual for it? for anything in the way of repairing it yourself, that would help immensely.
Do you have any electronics abilities? or tools and a voltmeter and some ability at using them? fixing this sort of problem will require disassembly (according to the service manual) and some use of those tools, plus some replacement parts, at minimum.
Let me know, by Reply To Expert, what your local zip code is, and the other things I asked about, and I will advise you further.