keys88

At least you've eliminated calibration as the problem. I'm guessing at this point-but it might not be the Screen at fault-the screen is only revealing what it is being fed-if you can't (or don't want to) disassemble this yourself to check the usual obvious problems-bad connections primarily-it might be a deeper defect unfortunately. If the screen's backlight and graphics are clear-as far as what you can see-the screen is probably no the problem. I am guessing this is a mainboard or related problem. Usually a chip screen driver fault will scramble characters or be intermittent-but wouldn't necessarily lock the screen. This type of lockup is usually, on several keyboards I've worked on-something scrambling up the internal OS routines-without deeper troubleshooting to locate where this is malfunctioning-preferably with a scope and multimeter, it is impossible for me to help any further. How have your power sources been? If you played in places with marginal or malfunctioning AC (it happens, I used to carry a multimeter to gigs to test the AC receptacles to see what I was dealing with-and used Tripplite power regulators constantly) here could be some (unfortunately) internal damage. Try alternate power supplies-the Casio original is still good? I also use 12V lithium power packs for backup and testing-no AC ripple or interference out the AC receptacles-to determine if the Casio supply is good-it can measure OK for voltage, but be defective for amperage-undersupplying amperage to a keyboard can lock it up.

Thanks Jokeyman. I will try your suggestions. I am still using the original power supply.

I can select tones and set up Registrations ....but only once before I can't get back to the main screen.

I have one more trick you can try-it may do nothing-but it won't harm anything, and it will sound strange, but worth a try. If you can kluge a barrel plug that matches the size of the one on your Casio-you might have to buy an assortment of these in various sizes that are usually designed for laptop power adapters, I have a huge bunch-and terminate this barrel plug with 2 open leads-as if you were cutting the barrel plug off your Casio power adapter. Plug this into the power jack and short the 2 wires-if it works (I am guessing but have had this work on a few other keyboards) it will act as if you are "cold-booting" the PX-which you can't do with the software routine's factory reset-and it might clear any software errors that could have occurred with a power brownout or surge. Leave these connected for around 15 seconds or more. I am not sure why this can work with all the complexity of internal logic chips but I have managed with an older set of keyboards to clear the memory and get these to boot up again.

There are no internal batteries in the PX560 I could find and I've had mine completely disassembled-so there is no chance any live voltage shorting and causing damage but do at your own risk. It may do nothing, but sometimes repairs require "black magic" as even a minor temporary error in one line of code can do amazingly bad things to these IC controlled devices, just like the "BSOD" in the Windows OS, which is almost always the IC trying to address a memory slot that isn't there, or once was but no longer exists, or throws out the wrong memory address for a slot that is there (yeah I had to learn all that).