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Hi, I replaced the screen on my iPhone 6 and now half the screen is black and there are vertical colored lines and the other half is really glitchy and like is flickering really fast. Touch screen and everything else seem to work, just the display. I would appreciate any advice . Thank you!

It sounds like a bad connection. Take a magnifying glass and make sure the connector is not damaged. Then clean it with a qtip and alcohol and a soft brush. Make sure you disconnect the battery before unhooking the screen connectors. There is a possibility that you have a defective screen.