Sharp EL-9900 wont start after replacing batteries.

Hi,

when you said it suddenly died, do you means after putting in new batteries,it did not turn on at all? If yes, below are some reasons for this problem;

Check the batter seat. I mean the position where the battery stays, look if you will find any rust of the battery terminal (metal). Rust can prevent the battery from contacting the unit, preventing it from receiving power. Get a flat screw driver, scratch the rust off, fix the battery back in and try again.

If there is no rust, then there is probably some disconnection inside the unit. This can be between the battery terminal and the board. Get a screw driver and remove all the screw. Take the unit apart and check for any lose contact between the battery terminal and the board.

I hope the above makes sense to you.......

Regards.