[Q] Screen flickering/shifting/cycling up
For 6 months, my Nexus 5 have been the best thing that happened to my life. But after the 4.4.3 update around Jun13, this display issue appears. Display keeps shifting upward in a continuous manner. For example, the keyboard is now in the middle, and the top part is below, it keeps flickering and moving. So I thought it may be a software bug since it coincided with the update (and no, I did not drop it). I tried all (factory reset, turn auto settings off, Developer options settings) to no avail. I contacted Google support and after a few emails, they told me to contact Japan support team. I don't know anyone from Japan. (Actually I do, but when he called them, the Google person couldn't speak English and my friend can't speak sufficient Japanese). (Note: A friend of another friend bought this phone from Google Store Japan)
So I thought, wth, let's open the back, maybe there're loose connections, like the battery or something. But now the adhesive is tampered with, a small dent in the case (due to the very strong adhesive) and the back does not pop completely back. One corner is a bit loose, so there's no fooling them that I have opened it.
I updated to 4.4.4 and new issue, the display is gone, just backlight. I managed to fix this eventually. Now I'm back to 4.4.2, and the display is still shifting. During bootup, Google logo is stable, but the next animation is shifting. Bootloader is stable, but sometimes it moves up a grid after I press a button. So I assume that the display moves when the system processes something.
So my conclusion now is that this is probably hardware/GPU issue. Or is it? My warranty is as good as void already since I can't communicate with Japanese, and since I opened the back, it really is void already. I have 2 immediate plans of attack: 1) flash a custom rom, if software issue; 2) buy a triwing screwdriver to check the back, if loose hardware.