Replaced Battery, the flash isn´t working and screen wont rotate

So today I replaced the battery of my Iphone 6, as soon as I changed it a couple of short vertical lines apeared at the top of the display, but after 30 minutes of use the lines dissapeared on their own, but now I tried to take a photo with flash and it isnt working, I tried restarting the phone twice, doing a hard reset and checked again that everything inside was correctly pluged in, and everything seemed good. Also the screen wont rotate, all setting are enabled for rotation but it doesnt rotate. What could be causing this and how could I repair it?