Yamaha psr-280 flashing display no key response or sound. Is it dead??

Question edited for clarity. 'make model (what it is), first 3 words.

Here

https://www.fixya.com/support/t29944524-could_problem_psr_333_yamaha_keyboard

https://www.google.com/search?q=psr+333+yamaha+reset

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What driver do you want to install?

Normally this would be from dirty or broken key contacts.

Dead keys on Yamaha PSR e413 keyboard: Flip keyboard upside down, remove cover screws (use marked cardboard template to remember where they came out), spray suspect key-contacts with fast-drying contact cleaner, (usually a PCB with a matrix of contacts under keys), re-assemble base cover, wiggle faulty keys as far as possible to 'scrub' any dirt or oxidization. If this cleaning trick doesn't work, get a pro to check it.

Hi, i think you can. You can go to any of the Yamaha companies around you area and explain to them the problem of the keyboard. They will give you good and quality replacement part for your Keyboard.

Make sure you go to only Yamaha company to avoid getting a wrong part for your Keyboard.Avoid road siderepairsforissue like this,it's more complicated to handle

I guess that will do.

Thanks for using fixya...

This MAY be due to a key contact or button that is STUCK "on".

Often this will freeze the controller.

Make sure power adapter is the correct one... underpowered or incorrect ones cause trouble.

rubber contact strip requires replacement

If it is very old, check if the volume control could be contaminated. Make sure a voice is selected via the buttons.

Do try the headphones before anything further.

An answer, but likely not a solution. I believe all Yamaha PSR series keyboards use the same 12 VDC adaptor, so I looked at the electrical schematic for another model I have. There seems to be no fuse on the power input. There are two components shown on the positive and negative wires off the power socket, but the symbols do not look like anything I have seen for fuses - they may be resistors. Power goes directly to a 5 VDC voltage regulator, which powers all of the solid state componenents. Too much voltage of the wrong type could have easily ruined many of the sensitive components.

Your only hope is to check the power socket area for the possibility of having fuses. My drawing shows the power socket, voltage regulator, and audio power amplifier being on one circuit board. That may not actually be the way it is in your model.

Good luck!
(your English is fine)