Xperia z3 screen broken and I need help - Xperia Z3 Q&A, Help & Troubleshooting

Hi,everyone,yesterday my Xperia z3 has broken for the upper area,then the touch screen for upper area can't function well but the bottom area(which has not broken) is functioning well,so do I need to change a new screen or new screen with lcd?if can provide me the link also for buying that and is better at eBay,thanks for help

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Edit: Turned out it was a ROM and bootloader issue . Reflashing fixed it.
When I was trying to enable android pay, I need to enable pattern for screen lock. And I feel that I cannot really touch the lowest part of the screen,.
So I enable the developer mode and show touch point. And I found that the lowest 5mm of the screen were not response to the touch. there are also 3mm to 5mm dead zone around the edge for other direction. Hows yours?
Edited
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