Chosen Solution
I just replaced the cameras on my iPhone 6. Everything works great except there is a vertical white bar on the rear camera sceen. If I zoom in the bar also gets zoomed in. I tried putting the old camera back in but the same problem. I’m not sure if anyone has any advice for it, but if you do please do share.
If both cameras do this, then I would suspect a problem with the connector on the logic board. I would open up the device and check to see if there is a broken pin or any debris that may impede a good electrical connection.