iPod touch 5g touch screen does not work after battery replacement

iPod touch 5g touch screen does not work after battery replacement
Hi everyone, after replacing the battery of my ipod touch 5g (A1421), following the guide in detail, being careful not to damage anything, when the job is completed perfectly, the touch screen doesn't work. the keys all work, just the touch screen. What could be the cause? I also tried the complete reset, but nothing to do. PS sorry for my bad English

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