Okay I asked this before but now I got another problem.
 
I've been experience a hum or loud buzz from my piano for couple years.
I don't have to turn the piano up just leaving it at 0 I can hear the hum or buzz from the built in speakers.
 
I thought this might be a ground loop problem but I tried few gear and nothing else is effected.
And I tried to unplug EVERYTHING in my room but the piano and still it hums or buzzs.
 
So if non my other gear have this problem could there be a fault wire inside the piano?
 
Thanks

If you plug in headphones, do you hear the same noise? (Disconnect all other audio connections.)
If you connect the line output to a headphone amplifier or some other audio amplifier, do you hear the same noise?
 
Wilko

yes and yes

I thought this might be a ground loop problem but I tried few gear and nothing else is effected.

 
Your instincts are probably right.  Though it is not a ground problem you would be likely to fix since it is internal.

I'm going to guess that the hum is being caused by the proximity of the keyboard to another device (maybe a display monitor?) that is spitting out EMI or RFI. My guess is based on the assumption that this particular keyboard may not be shielded very well. The idea that the hum can be observed on the built in speakers with the level turned to "0" suggests to me that the noise enters the amplifier stage after the level control. It could be an internal issue like a wire with a degraded connection to ground or maybe a shorted blocking capacitor but I'm going to go with ineffective shielding and proximity to a noise source as my guess.
 
:-)

When you unplug it does it stop?...Just kidding
 
Like Mike said...it sure looks like it might need to go to a repair shop unless you know how yo safely disassemble it and clean connections, test caps, etc.

Thanks for all the responses and I agree must be the piano it self.
Right now I got it plug into strip by itself with piano lamp.
But still makes the hum buzz sound as well my friend/teacher said must be the piano.
 
I'm looking for new piano I don't have lot to spend but need some than good for classical
Mostly nice sound and good key touch I found few between Casio and Yamaha.
 
Yamaha p 150
http://www.amazon.com/gp/product/B008FVBX7A/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
Yamaha np 31
http://www.amazon.com/Yamaha-Piaggero-NP31-Lightweight-Portable/dp/B005BRRO6U/ref=sr_1_2?s=musical-instruments&ie=UTF8&qid=1396941786&sr=1-2&keywords=yamaha+np
 
Casio priva px 150
http://www.amazon.com/Casio-PX150-BK-Sensitive-Tri-Sensor/dp/B0094KNESM/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1396941847&sr=1-1&keywords=casio+priva
 
Thanks

What kind of bulb is in the piano lamp?
 
Is there a dimmer or brightness switch involved?

It would be a fair test to take it to another room and plug it in by itself.

xacto. :-)