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If you have access to another (working) kindle 3, you could swap parts to isolate the problem. It could be the screen, or the keyboard, or the motherboard. You could also try swapping batteries.
Keep track of which parts belong to which kindle so you can put them back.
It would help to connect to the serial port to see if it boots up far enough to display status messages at the serial port. See the seaniko7 (kindle 3 unbrick) youtube video.
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