Do you have a repair schematic for a casio privia px-575r?

This link might help.

https://www.google.com/search?q=Casio+Privia+px-100%2C+loud+key

..

https://www.casiomusicforums.com/index.php?/topic/19061-broken-keys-of-privia-px-120/

https://www.youtube.com/watch?v=lREFbtqDr90

https://100tutos.com/video/1664158/how-to-repair-a-stuck-key-on-a-casio-px-120-digital-keyboard/

Download Service Manual for PX-410R as PX-410R is the same model as PX-575r.
http://www.circuit-encyclopedia.com/listinfo-67-111.html

Casio don't supply PX330 drivers for IPAD.
Get a Windows 8.1 tablet or connect PX330 to a desktop PC and use IPAD to Remote control that PC.

Try this
1. Turn off the digital piano
2. While holding down both the (TONE) and (FUNCTION) buttons, press the (POWER) button

YES. Either plug in headphones into the headphone socket. There should be a switch on the back which disables the speakers as well. A simple ON/OFF switch for speakers

Check the midi channel. It needs to sync to FL Studio. Channel settings you'll need to look up in the privia manual...can be laborious - but worth it in the end :)

Try checking your power cord. Perhaps someone stepped on it and it pulled out. It happened to me once. I thought something was terribly wrong with it. I was pretty embarrassed to find out that I'd just cut off power via cable... check your cords before worrying too much. If nothing seems to be wrong, take it in to the repair shop.

Here is a link to the manual:http://ftp.casio.co.jp/pub/world_manual/emi/en/PX410R_e.pdf Page E-79 describes the procedure. Here is a link to their support page in case you don't have the CD that was bundeled with the keyboard:http://www.casio.com/support/

If I were to venture an educated guess I would vote for failing filter caps in the power supply.

The power is likely collapsing under load of the speakers but headphones take much less drive.

If this has an external wall-wart power supply, you might try a new one IF the output is found to be under the rated voltage.

Internal power supply components are beyond those individuals that are not adept at electronics.