Q: my screen does not light up

Howdy plamangel,

Welcome to Apple Support Communities.

The article linked below provides troubleshooting suggestions for issues like the one you described, where your iPhone 5c has a blank black screen but appears to be responding to some commands.

Get help with the screen on your iPhone, iPad, or iPod touch - Apple Support

If your screen is too dim, too bright, or you see only faint images

1. Try to adjust the brightness. If the screen doesn’t respond when you adjust the brightness, open several apps to make sure it’s not an issue with only one app.
2. If you have a screen protector, try removing it. Try removing your case if it includes a screen protector.
3. If you see the issue in multiple apps, restart your device.
4. If restarting doesn’t fix the issue, restore your device.
5. If you still see the issue after you restore, contact Apple Support.

I hope this helps,

-Jason