I just booted my Phantom 3 and all I am seeing is purple lines when I put it into video mode. When I put it into camera mode they disappear, but they will only show during video mode. Also all recorded images have either purple or white lines over them.

Did you ever figure out what was wrong?

Hey guys, i had a similar experience after a heavy landing, a couple of the wires from the gymbal harness pulled out, i replaced these harnesses and still had the same issue, then i purchased a replacement ribbon cable but didn't get an OEM DJI ribbon, big mistake, the new cable was of thinner construction and each time it was plugged in i had a different fault present itself, eventually i have installed an OEM ribbon cable and all issues have gone away. From my experience the ribbon cable is very flimsy, my damaged cable had no visible signs of damage any where.
Hope this helps , happy flying.
Lee.