SOURCE: Casio Privia keyboard PX-100
There are a number of issues that could cause this, the most likely culprit is the power supply, when I say power supply I mean the internal power supply,
This means that you have already obtained a good "known to work" AC to DC power supply, and tested it on your keyboard to see if that is the problem.
If you have completed this step, then your next step is to test your unit with batteries only, if the keyboard works, then you know your problem, is internal to the keyboard.
There are two issues to check, before proceeding please read the following note.
(a note here for those who have no experience working with internal electronics)
If you have no experience working with internal electronics I would not recommend, opening your keyboard.
Two reasons, one, will void warranty if it still is under warranty.
secondly, you could accidently cause more damage to the unit.
Now if you are still reading, and feeling confident, you know that as a child you have dissembled many many electronic devices, just to see how they work.
If you do decide to open the box, disconnect the power supply to the unit including any batteries.
open the box and locate the power on button, clean using a Dielectric cleaning agent, can be obtained at most electronic specialty stores.
clean the power button, may work but doubtful, usually the switch itself is usually bad, there is a way to test the switch, however, that is beyond the scope of this answer, if you are following this you will most likely have the knowledge to do this.
The second and more challenging issue will be the internal power supply to the keyboard, or the interface that connects to your ac to dc converter.
This can be much more trickier, and I wont go into it here.
If you test your power switch determine that it is good then you should consider getting the unit serviced by a technician.
If you examine the boards, (electronic circuit boards,) and notice burned, connections, (darker than other circuits) then most likely it will not be worth trying to fix.
Hope this helps somewhat, if nothing else, take this print out to your local service dealer, and that will help in getting your keyboard repaired,
Delete this part, before taking this to your dealer,
Most electronic products can be easily fixed with a power switch, or power supply, however, many dealers will not tell you this and give you an estimate of fixing the unit that far exceeds the actual cost of repair,
an example, in a local TV repair shop, a friend brought in a wide screen Plasma HD TV, quoted repair, $654.00 problem,
power supply, actual cost, $75.00 my friend ordered the part online and with the help of a friend installed the new power supply returning his unit to full functionality.
So beware,
SOURCE: I have a Casio Privia PX-320. The left side keys
Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.
SOURCE: casio privia key issue
The only way to analyze this is to open the case. You may find contaminating material has gotten in, or broken part, or key slightly out of position on pivots or pivot plastic broken.
When opening, be VERY careful of the tender ribbon cables. Have a large work surface that you can unfold the top onto. Be careful to use correct screw lengths and thread in each place you removed.
SOURCE: Casio Privia PX-130, 8 months old: fluttering sound
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.
SOURCE: My Casio Privia PX-330BK Keyboard won't turn on.
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.
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