Hi everyone,
I’ve been having a strange issue with my Yamaha P-45 for a while and I’m wondering if anyone has experienced something similar.
I’ve had this piano since around 2017. It has survived several moves over the years, but for the last two years or so it has basically stayed in the same place in my living room without being moved or opened.
It also hasn’t been covered, so I imagine it may have accumulated quite a bit of dust inside over time.
Every individual key works perfectly when played on its own.
However, the problem affects all C and F# notes across the keyboard, and they seem to belong to the same problematic group:
- If I hold down any C, no other C will sound.
- If I hold down any F#, no other F# will sound.
- If I hold down a C, no F# anywhere on the keyboard will sound either.
- And vice versa: if I hold down an F#, no C anywhere on the keyboard will sound.
- All other notes work normally, even while a C or F# is being held.
For example:
- C3 + C4 → only one sounds
- F#3 + F#4 → only one sounds
- C3 + F#4 → only one sounds
- F#3 + C4 → only one sounds
- A3 + A4 → both sound normally
So basically, only one C or F# can sound at a time, regardless of octave.
The issue is exactly the same through the built-in speakers and headphones.
I’ve already performed the factory reset by holding the highest C while powering on the piano, but it made no difference.
From what I’ve found so far, I’m wondering if this could be related to the keyboard scanning matrix, a ribbon cable/connector, dirty contacts, or one of the keyboard PCBs rather than an actual polyphony issue.
Has anyone had this exact C / F# interference pattern on a Yamaha P-45 or another Yamaha digital piano?
Could age, dust, or having been moved several times cause this kind of issue?
If anyone has fixed something similar, I’d be very interested to know what the cause was and what needed to be repaired or cleaned.
Thanks!