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I think that it might be a tone generator chip gone bad... but I don't know what the distortion sounds like. Please describe it a bit more.
Yes, sounds as if you might have a dirty potentiometer or the like.
Are there any such in it?
If there is a keyboard, and the machine is Used, then... you may need to use an air compressor, of the type used to inflate tires, to spray air forcibly into the cracks between keys, to clean the inside of the keyboard thoroughly.
That may not be enough, if it is quite dirty or the like, but it is a thing to try. To see if it improves things.
(I am in Eastern Time, and I regret to say it is very late and I may soon have to resume this case tomorrow... if that's OK? good evening, if so.)
I stand by my recommendation of cleaning between/into the keys, e.g. with adjacent keys pressed down to let more forced-air into the space between them.
The white noise may well mean a bad capacitor(s) somewhere. Look for any capacitor that is leaking, or has a bulging-out top, and replace all of those.
Also, look for brown spots under components, or on the opposite side of the circuit board from components. That can indicate an overheating component, that needs replacement.
Let me know what results you get from my recommendations.
Or if you're done with this case, and don't wish to continue, please rate my answer. Thanks.
I am truly an electronics technician. If you look into my online profile you will find that I was officially verified as such.
Pardon me - you are not out the money. You have chosen to stop the conversation before it is finished... I can offer more advice I think.
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