Yamaha Clavinova CLP-175 Noise, crackling

[Kevinlow831]

Hi All.

I've recently purchased a Clavinova CLP-175 Baby grand. The owner did say there was a little bit of static when first switched on which goes after 20 minutes. Sadly this is now not the case. I'm hoping someone out there may have experienced this and knows a fix.

When I switch on it silent for about 10 seconds, then you get a crackle, electrical click through the speakers. This gets worse the longer you leave it on.
The sound is through the headphones too.

When you play a demo song it is really bad, crackling, static noise, also when you press keys especially multiple keys like a chord the noise is loud and only stop after about 10 seconds after releasing keys.

Leaving it alone and switched on, there is a weird reverbed crackly and fizzing.
Unplugged and replugged all connectors.
Tired different wall sockets outlets and powers leads
Tried with and without headphones

This is a beautiful piano and looks great so really want to fix

Any help really appreciated.