first off, it may not be a board issue at all. have you dropped liquid on the phone recently? do the keys still depress properly with their little click?
first thing i would do is pray its an OS or software issue and try a battery pull. if they still dont work, i would reload the OS. if they still didnt work, and i felt like putting money into an old 8310, i would possibly try taking it apart and making sure everything was clean and dust free inside, maybe replacing the keyboard.
in reality, this phone can be had for $50-100 used and probably not worth putting too much effort to if its out of warranty. if all of the above doesnt work, i would replace it through insurance (if i had it), or buy another phone.
Even if you didn't actually drop liquid on the device, if you had it in the bathroom, steam from a shower can infiltrate and cause keyboard malfunction. It may not have even been recently.
You could try a new keyboard tray, but I wouldn't invest a great deal of effort in it if it's toast. I'd at minimum try to find a used 8900 or 9000. You could at least keep one of them going for a while OS-wise.
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