I have a screen problem. It is a droid 4 and all i did was change battery

[AC Question]

I don't know what happen. I did seperate the battery but got a new one and still the same. white screen with black lines

 

[Rukbat]

The battery is non-removable, which means that you opened the phone. You probably unplugged a few cables or moved them - which led to the screen problem.

Now you'll have to bring it to a shop that will work on a device you've already opened (many won't), pay them to fix the damage you caused, then pay them to fix the original problem.

Next time, bring it to a shop first.