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got a picture of the damage? it sounds like the backplane is broken, as i have had the same problem with my '505 after a battery change due to the inadequate protection behind the screen.
in my case it also flashed but it was obvious what had happened as there was a diagonal line on the screen (tilting at an angle revealed this)
interestingly the presence of a dot suggests damage already existing. I wonder if in this case they used the wrong length screw at the factory and it pressed on the backplane?
just a thought.
fwiw if you have a '505 with bad battery just send it back for repair, its not worth the risk of breaking the screen repairing it yourself.
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