I've just acquired a 65 that has had a pretty bad battery leak.
Before I took it appart, I cleaned the battery cavity and contacts and tried it. Nothing. Then I plugged in a charger and viola it can to life.
Well almost. It briefly showed 0.00 (left justified) but now most of the time shows 00 00 (center/right). Does the display show four 0's in program mode?
More importantly, NO KEYBOARD ACTION.
I decided the leak must have been bad enough to foul something inside. Now I have it apart and the card reader PCB had some copper oxide buildup as did the backside of the keyboard. There is some oxide on the front side and I'm afraid there may be some beneath one or two rows of the keyboard.
I've carefully scraped and washed these areas I can get to. Still nothing when I tried it. Works the same way.
suggestions? keep cleaning or is it on of the chips?
Peace