Hello, I’ve been trying to figure out how to get my piano working again. I had it plugged in the wall when a lightning strike hit near the house and fried a few things plugged in the wall including my Yamaha MOXF6. I replaced the power cable and realized it didn’t turned on still, so I opened it and replaced the motherboard for the power supply with one i got from eBay and it turned on!! But now I get this kind of like constant popping sound when I connect it to a speaker out or headphones. I get no sound out of any piano voice or styles or anything. What could be the problem? Please help 
