Parts Needed to Fix: C & F#s Dead All Octaves

I’m looking to buy parts from your website. Can you help me identify the right parts below?

Hi all the C & F#s are dead in every octave. I have a Yamaha P125 88 keys. Based on some feedback it seems I need to replace the key contact boards. Do i need to buy all 3 boards?

“All keys are selected in groups of 6 - you find that all C and F# are selected by the same select line- therefore your issue is narrowed down to one of three areas; the middle board of the 3 key contact boards at sound the area where the flat ribbon cable going to the main DM board (Main Board) is connected, the ribbon cable itself or the part on the DM board where the key selection is made (ie Buffer chip or key select processor chip). From experience I would have a closer look at the area in the middle key contact board where the flat ribbon cable is connected.” - Wernersaurus (thanks again!)

I’d like to try replacing the middle key contact board first and looking at the ribbon (replacing if needed) - then if that doesnt work, purchase the Main Board (which is more expensive).

Can you help me verify that these are the right parts?

  1. Middle Key Contact Board: Key contact board, 36-note (Mid), Yamaha - Syntaur

  2. Flat ribbon cable : is there a part for this?

  3. DM Main Board: Main board, Yamaha P121/125 - Syntaur

Thank you!

Replacing the middle key contact board is definitely a good place to start. We have all of our parts for the P125 listed here.

Both of the boards you linked are the correct ones for the P125 and this is the ribbon cable that connects the main board to the middle key contact board.

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Perfect! Thank you so much!