Fixed Yamaha P85 no sound

by Dave
(Canada)

My P85 had no sound so I used the service manual to replace a part on the circuit board. C122 was at fault. The service manual has schematics and the pcb is well marked. I have an electronics background and know how to solder.

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Aug 21, 2019
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p85 no sound / no power?
by: ctijn

Our P85 also makes no sound. When pressing the Standby/On button, the red LED turns on for a few seconds (some days just 1 second, some days a bit longer). Then there is a clicking sound coming from one of the electronic components (not the speakers, it sounds more like a relay, perhaps an automatic fuse?). Then the red LED turns off and it seems that there is no power on the system anywhere.


- I opened the unit to look for water damage or other short circuit causes but didn't find any.

- The power adapter gives a voltage of about 17V (when not connected to the P85)

- a few days ago with the unit open, I connected all cables and had power (red LED on) for about 20 seconds, during this time all piano keys worked and produced sound, the voice buttons and 'demo/song' button did not work. then I tried again and it was back to the problem described above: only a few seconds of red LED on)

Would you have any idea how to diagnose and repair?

Thank you!

Feb 02, 2019
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Yamaha P85 no sound fix
by: Anonymous

My Yamaha P85 had a no sound problem too. I replaced the two 100uf capacitors at locations C216 and C217 on the board where the DC power plug connects. Fixed it right up.

Jan 21, 2019
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How did you find the problem sourse
by: Anonymous

i been looking at the circuit but i cant find the problem source

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