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Dan,

Welcome to the group!

Contrast adjuster could be flaky... but otherwise my bet would be capacitor plaque...which unfortunately can be rather hard to diagnose, which is why people will often replace all the capacitors if it is strongly suspected. ?Google “Capacitor Plaque Wikipedia” for more detailed info and pics on what to look for.

However, before going that route, I would open it up and check to see if you have had any significant battery leaks any/or corrosion... you will need to take the entire back off to be certain, since the battery compartment can sometimes not gove an accurate picture.

If you have corrosion then cleaning the PCBs thoughly (and carefully) with alcohol (or electronic cleaner) might resolve the issue.

Cheers,
Eric?
--
The Yamaha QY70 / Yamaha QY100 User Group??- A forum for the best band in a box synthesizer/sequencers ever created on the planet earth.

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