Antwoord op "After replacing iPhone 5s screen there're vertical stripes. Now what?"Is the video (uppermost) plug. I replaced my wife's screen this weekend, same result like you. Reseating the plug ( multiple tries) finally worked. Just make sure you unplug the battery while "having fun". The phone is allergic to hot plugging.
Antwoord op "Why is the picture not working after screen replacement"If the top-most plug is not 100% seated (you should hear the snap), than the whole thing is getting "creative". Make sure your battery is disconnected while you play with the plugs: like any computer, the phone can be "allergic" to hot swapping.