The white lines are a common problem is the digitizer not being connected properly. Try disconnecting your display cables. Disconnecting the battery, reconnecting the battery, then reconnecting the display connections. Make sure you hear that little "click" as you gently apply pressure to the display cables. Here's a couple guides.
The way to test this, is to remove the screen from the casing, while still connected to the logic board. Let the screen rest on top of the casing. If the distortion goes away, and stays away, then the case is putting pressure on the screen causing that. You would need a new frame, or it straightened. In this video, I'm going to show you 3 reasons why iPhone display line occur and what are the simple and 100% working home-based solution. for more
Step 1 How to fix touch in an iPhone 6s. If you want to find out how to replace your iPhone 6s smartphone follow the submitted guide. In case of any troubles feel free to post questions. 3 comments. Conclusion. To reassemble your device, follow these instructions in reverse order. Give the author +30 points!
Options. What you wanna do is lower your brightness all the way down, turn off your phone and when it's on put the brightness all the way up, set it on night mode and set your phone on a warm surface or somewhere warm. After a couple hours (12-24 hours) it should look better if not there is probably water that damaged the inside so in that case

Step 1 iPhone 6s Teardown. The 6s may look the same as last year's iPhone, but there are plenty of new features in this phone: 12 MP iSight camera supporting 4K video recording with 1.22 µ pixels, and a 5 MP FaceTime HD camera. 802.11a/b/g/n/ac Wi‑Fi with MIMO + Bluetooth 4.2 + NFC + 23-band LTE.

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An iPhone 6S screen replacement involves removing the damaged or unresponsive display and replacing it with a new one. The display consists of two parts - the LCD and the touch screen digitizer. The LCD displays the images and videos on your phone, while the digitizer responds to touch inputs. cuNM.
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  • iphone 6s lines on screen