Piano World Home Page Forums Our Most Popular Forums Digital Pianos - Electronic Pianos - Synths & Keyboards Yamaha P-45 Blinking Power Light

I have a Yamaha P-45 that's worked flawlessly for the past four years, but recently it's starting going into initialization mode whenever I turn it on. The power light keeps blinking without responding to any input, even the reset combination is not having any impact. Is there any owner of the P-45 or P45b on here who has faced a similar issue and found a workaround or fix for it ? Apart from this sudden issue this particular model has performed beautifully and I would not hesitate to recommend it to anyone i know, but this sudden turn of events has me dumbfounded. If anyone has gone through something similar with their yamaha, please do share...

First thing I would do is try with another power supply

Yeah, that was my first thought too. But even with another official yamaha adapter of the same model, different adapters with the same voltages and a series of different power points around the house, it gives the same issue. It just doesn't come out of initialization mode . There must be some hack around to jolt it out of that mode, but the system is so damn black-boxed. When even the engineer mode as well as hard reset require interaction with the keys, I'm literally locked out.

I doubt there can be any way to "jolt it out of that mode". It's likely that the controller board is defective.

Yeah, so it seems sadly. I was trying to avoid lugging it over to the service centre in this lockdown, but there's no way I'll be replacing the controller board at home. Thanks for your responses!

Hello,

@Bobeshwar, Please note that this is just a hunch on my side, for I do not own that Yamaha, but:

Is there a backup battery (often of the coin/button cell type) inside the P45? If so, you could take it out, let the piano sit for some time to let any remaining charges in the circuits die out, and then put a fresh one in. During this, do not have any power supply connected, of course.

This is the 'hardest' reset I can think of, perhaps that might restore normality.

Again, this is a shot in the dark but wanted to give you this idea still.

Cheers and good luck,

HZ

Hi, That's a good idea. However, everything seems to be bolted in one single assembly held together by around 40 screws. But the service manual doesn't show any component resembling a battery or power storage of any kind (apart from the million capacitors lol). So if I disconnect it from the mains and let it sit for some time, it should replicate the behaviour you mention. After every other trick I've tried, this definitely can't hurt. Thanks for the suggestion!

I am sorry, but that kind of electronics is not easy to troubleshoot. I work fixing electronics (mainly radio communication gear but also electronic music instruments) and some months ago I worked on a Yamaha CLP-155. It made all kind of weird things, from repeating notes to playing other ones to not powering up. After much struggle I found a defective crystal oscillator on a secondary CPU which acted up. Replacing it fixed all the issues, but of course that kind of troubleshooting requires experience.

So, your best bet is to take it to a Yamaha service.

Good luck!

Hello,

@EB5AGV, Such a fine-grained diagnosis (on that CLP-155) and remedy is quite a feat, Jose!

👍 👏 😌

Cheers and happy problem solving,

HZ

Oh wow, that's some amazing work! Most engineers around here would not go deeper than simply swapping out parts. That kind of troubleshooting is well beyond my skill set. If HZPiano's charge-draining idea doesn't work out, I'll definitely be heading to a service centre.
Thanks!

Has anyone found a way to fix this problem? My P-45 has the same problem.

I tried looking online for solutions yet failed to find one.

However, I found this troubleshooting tip from a different product but has the same problem.

--------------------------------------------------------------------------------------------------------------
LED is flashing
Flashing red. (Flashes in 2-second intervals)
Protection circuit activated due to a rise in internal temperature. Turn off the power, wait for the set to fully cool down, then turn the power back on.

Please re-install this unit in a place having good ventilation.

Core wires of two speakers are touching each other or a core wire is sticking out of the terminal and touching the set’s rear panel, activating the protection circuit. First unplug the power cord, then twist the core wires tightly or terminate the speaker cables, then reconnect.

Flashing red. (Flashes in 0.5-second intervals)
Turn down the volume and turn on the power again.

This unit’s amplifier circuit has failed. Disconnect the power and contact the repair center.

https://manuals.denon.com/PMA150H/NA/EN/OBAOSYdxsymxad.php
---------------------------------------------------------------------------------------------------------------

Hope this helps everyone including me.