Chosen Solution
After replacing the screen, I connected the wrong cable from the screen to LCD port on logic board. I saw a tiny bit of smoke/vapour so i disconnected really quick. Now the replacement and old screen show garbled display. Can this be fixed? Would returning to apple for OOW repair be only alternative? Here’s what it looks like. I’ve tested a few screens and they all look the EXACT same. I’m thinking its display IC or something?
Unfortunately at this point it is not a DIY anymore. And OOW repair is not the only alternative as you can take it or send it to a micro soldering repair technician for diagnosis and repair. It should cost you less than an OOW repair at Apple for now, unless the screen is damaged as well. Let them quote you then decide accordingly. If you’re not sure who can do it for you, ask your local phone repair shop (they may do it or outsource it). Alternatively check my profile here for a link to a website with a list of reputed micro soldering repair specialists. Most if not all accept mail in. Your issue can be display/back-light circuit as well as touch circuit (very common on 6 Plus). Cost can build up very quickly, so a picture of how your screen looks right now can be helpful to determine what could be wrong. But if you connect it to show us the issue, turn it back off quickly just in case something is still shorted.
Try to disconnect the battery and reconnect it. If that doesn’t work and you have to send it in go to a website called gadget drop.com and and they do micro soldering and they can fix it. For the ic chips it $100 or for it to be reworked it is about $60.
First Battery must be connected after LCD connectors. Battery must 100% charged befor starting. Do a hard reset, then, Update iTunes to the latest version before you start Try doing a restore using a USB cable connected to a PC in iTunes. The LCD calibration software will only work when connected to a PC via charging cable when doing a ~>Restore to computer
