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Apologies for the late reply, I am limited on how may responses I have in one day. THANK YOU GUYS for taking the time to pluck out all the details. I have some keyboard buddies that will let me know whether or not to fix the keyboard or buy a new one, I'll farm the work out to one of them here in San Diego.

Uploaded more pics of the boards. I can see the battery is mounted to some clip away from the board, it seems glued to it. Not sure how to replace it, I have the CR2032. No leaks, cracks etc.. anywhere I can see. I will keep looking more closely.

Thank you for posting a response. The cable is just set there, nothing to worry about. So all I hear when turn it on is the slight static-pop of the built in speakers (can also hear it in the headphones when turned on) a very quiet hum that settles within a few seconds. No scent. Opened it up, see link below for images. Any advice before I open it up would be appreciated. - Thank You https://drive.google.com/drive/folders/1bE3Uwe8neBlJm4LauS_qqzhyq1xDduCx?usp=sharing

I recently adopted a Casiotone CT 6500, it turns on but no sound. Any advice would be great, thank you in advance. See link for video clip turning on the piano. https://drive.google.com/file/d/1dEiWn3EapZ-LyJVCrtjLlA3GhkXjrrXB/view?usp=sharing