Casio ctk-501 the power input cracked on the curcit board i did a bypass wiring over the crack and it got power works again but only till i start playing a bunch of keys then the sound gets stuck and the keyboard frezzes. any idea why or what causes this. id hate to through it away but i might need to. pleas help

"Casio CTK-501 Digital Keyboard Troubleshooting - iFixit" https://www.ifixit.com/Wiki/Casio_CTK-501_Digital_Keyboard_Troubleshooting

Question moved to Casio Keyboards.

Take it in for service. Sounds like it needs a new switch or control board.

https://www.google.com/search?q=Casio+CTK+4400

..

Many Casio electronic instrument manuals are available here: http://support.casio.com/en/manual/manuallist.php?cid=008 . However, I found the CTK-519 manual at Manuals Lib: https://www.manualslib.com/manual/358021/Casio-Ctk-501.html .

I hope this helps.

Cindy Wells

I prefer, only in CASIO authorized service

The board is cracked? "busted"... replacement only solution. If non-operational repair the unit. Failure to connect via USB is COMMON and is not indicative of "busted" motherboard.

Make sure the driver is compatible with your operating system... often stuff will not work with Vista for example. Often SOME software REQUIRES it to be installed before USB cable is connected, and yet other requires it not be connected till software is installed... read the manual...

An internal fuse is UNLIKELY.

More likely is either a bad connection/connector at power input or a bad or intermittent power switch.

First verify with a voltmeter that the adapter IS producing the voltage it is supposed to.

The cords and internals of these often fail.

Anything beyond that will require servicing. One could oppen the unit and look for bad solder or cracked board NEAR the power input jack.

Probably a damaged power connector or a cracked circuit board near the connector.

Look for circuit board cracks with a bright single LED light by candling the board from the opposite side.

You probably have a bad solder connection at the inductor which is a filter coil to reduce EMI.

It is not uncommon to have one of these heavier components bust the solder connection...

NOTE: It takes a trained eye to spot the little gray ring around the lead that says the connection is broken.

Reheat the solder of the connections on that inductor and see if that doesn't fix it. If not, continue tracing the voltage.

ALSO a cracked circuit board can manifest itself this way. USE A BRIGHT LED flashlight to "candle" the board and look for cracks.