Try plugging it into an external display via the HDMI / VGA port and see what happens. If it powers up to an external display, then the LCD on the unit might be bad. If it doesn’t power up to an external display, then it might have a hardware issue preventing it from booting. In that case, you would need to check the manufacture website for the manual that might tell what’s wrong with it based on the lights. Also try removing the battery for 30 min and make sure there are boot disc in the CD / DVD drive.
I don’t remember how the AC is controlled, but I used to have a 98 Dodge Neon R/T and removing the AC controls is very easy to do. Replacing it is also just as easy if you can find a replacement set of controls in a junk yard. You need to see how they are operated first to determine if they are controlled by cables or electric.
I spent some hours researching this issue and came across this video after trying to update the phone via restore mode and received an error 26. Turns out that this video explains the issue very well. https://www.youtube.com/watch?v=WUmY6TVS... The video is very lengthy, but @12:30, the lady explains that using an iPhone with a bad battery; up until the point that the phone will no longer take charge, will cause data corruption. This is why the phone would not power on complete and was stuck in a boot loop. It was only up until I did a complete factory reset (last resort for me), that the phone restored and worked.
My best guess is that the buttons are worn out. Especially if you use them often and don't use an external USB mouse. I've seen this issue on several laptops. If you have to press harder than normal to get them to work, then they are worn out.
Pretty straight forward and easy repair. The problem is probably the replacement charge port. I noticed the majority of the aftermarket charge ports for iPhones have crappy soldering jobs and usually have problems. It's best to replace the charge port with a used original one from eBay. You could isolate the issue by plugging back in the old charge port w/o actually installing it, and see if the phone will take charge. If it does, then it's the new one that's bad.
I had a similar issue like this. I replaced the screen on an i7+ with two different aftermarket screens from my brother. He buys cheap screens and it was my only choice because the person wanted their phone fixed that day. I installed the 1st screen and about 24hrs later, the touch stopped working on it. I assumed it was the screen and installed a 2nd screen from my brother. 12hrs later the touch stopped working again. At this point, I ended up getting a 3rd higher quality screen from my usual supplier and the touch stopped working after about a week. A hard reset fixed the issue, but the issue came back again. I posted this as a question, and the only answer I received, was to make sure the black tape that's on the back of the metal plate gets transferred over and stuck to the ribbon cable of the new screen. It was not installed, because that black tape usually does not fit around the touch IC chip that's on the ribbon cable of any model after the i6/i6+. Basically any model with 3D touch. I am to the...