I have the exact same issue on a client's Macbook Air (13" 2015) : the charger goes orange even when the battery is disconnected. The first time she brought it to me, the battery was fully discharged (after several weeks unplugged) and the macbook worked fine, but after one day or proper operations, the issue went back : impossible to turn it on. The Apple Store told her that the motherboard needed a replacement (a 600€ repair). I’m wondering if a replacement of the left IO board would solve this issue
I had the same issue on my iPhone 7 (no display but backlight OK, after a 10 centimeters drop of the phone) : I found a local repair shop able to solve it : a fuse resistor was blown on the motherboard, he found it and shunted it in like 5 minutes. I’m the one who was really blown
I have the exact same issue on my old iPhone 6 (dropped in water, cleaned with isoprop alcohol, got no sound issue but works properly) : I ordered 2 different screens from 2 different Aliexpress seller : the screen stays black if I connect it before turning the phone on. If I switch the screen after turning it on, the backlight turn on but there is no display. I haven’t tested the two screens on another phone but they seem both deffective
I had the same issue after replacing the screen of a Series 2 (on WatchOS 5.1.3) : impossible to pair it with my iPhone 7 (iOS 13.3.1). I have just found an alternate solution, using my old iPhone 6 (on iOS 12.4.5) : it didn’t ask to update the watch for pairing and succeeded to pair on my first try ! I then updated the watch manually, to watchOS 5.3.6, unpair it and pair it to my iPhone 7 successfully ! My theory : an old iOS version can pair a watch with an old watchOS and be used to update the watch.