Screen doesn't work. (story)

I am a Nexus 4 user. My brother sent me this Nexus 5 to me, but had problems with its screen. Sometimes it wouldn't show anything, other times it would show white lines and other times it would press things on my screen while showing some white lines. Some punches fixed the issue, but it wasn't a permanent solution.

Today, I opened the back cover, removed the battery and EVERYTHING else. Afterwards I cleaned it up with some cotton pads safely and without any force and attached the parts. When I pressed the power button, it didn't show the Google logo because I had forgotten to attach a wire. When I saw it, I attached the cable and it worked; it showed the Google logo, booted up to the part where I can see my lockscreen but then it went black.

When I tried to turn it on, it wouldn't show anything. I didn't destroy anything(imho) during the procedure. The LED light is yellow when I attach it to a USB(meaning it charges) and Windows 10 recognizes it when I connect the phone to the PC(a message pops up saying Nexus 5 was connected). "adb devices" shows the devices.

Is it the screen? I have un-screwed it a thousand times. Do I have to replace the screen+digitizer?

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