Why does my screen have black and white lines
my screen has black and white vertical lines going up and down it still works
From what you are describing, it sounds like you are having some LCD issues. Posting a picture like @minho said would be best but this is a common thing among these types of devices. Here is a link for a replacement part and guide: iPhone 6 Plus LCD and Digitizer
If you cannot do this repair yourself, I would recommend contacting a professional. Please ask any other question and post any helpful pictures.
One other thing I am think is that if you have black and white bar dropping down, you may have the infamous touch disease which causing touch issue every now and then or all the time.
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Can you post a picture and give us a bit of background on what happened to your phone prior to this problem?
由 Minho 完成的