Chosen Solution
so, a few months ago i cracked my screen and i recently got it repaired. everything seemed fine at first but then these horizontal lines began to appear right before my screen turned black. i tried turning off my phone and turning it back on but, it’d take forever to show my home screen. i don’t know what to do or how to fix it.
Could be loose LCD cables but most likely sounds like it needs another screen replacement. Sometimes repair shops can get parts that are somewhat defective. 6 plus screen replacement can be found here: iPhone 6 Plus Screen Replacement
