As stated by @stressmaster, it seems the USB port or cable is broken. However, there is no need for any soldering, as it is possible to just buy the entire USB board with cable. Lot easier than replacing the USB port itself.

I have encountered a similar issue with a PS3 before. I opened it up, stuck a thick piece of tape on top of the disk drive(metal cover) to put more pressure on it, and closed it up again. This seemed to work perfectly. You could give it a try. Make sure you stick it on top of any metal cover it might have, and not directly on the magnet as it will keep it from spinning at all.

Once you open your controller and take out the motherboard, you can see the flat cable that all buttons are connected to. Make sure that the contacts are fully clean, both on the cable and the motherboard itself. Use some rubbing alcohol(isopropyl alcohol or so) to clean it, as water may damage other components. If that doesn't work, you could try to replace the flat cable and see if that works.

Make sure to check the following things: (1) No major scratches on the discs; (2) The disk actually starts spinning; (2.1) You should be able to hear it spin when you're close to your console. (3) There are no stuck discs inside (3.1) To remove a stuck disc, either hold the eject button until it has been removed, or open the HDD cover by sliding it off, and look on the left side of the console. Between the vent holes should be a small screw that allows you to manually eject a disc. If none of these apply, it is quite likely that the lens is dirty. Buy a lens cleaning disc, or for a higher success rate, open your console and clean the lens with a Qtip and some isopropyl alcohol. If it still doesn't work, the Blu-ray drive is mostlikely broken and needs replacement. Good luck!

I suppose the easiest would be to follow this guide: https://www.youtube.com/watch?v=C7qJ3Ch1...

For as far as I know, Samsung does not sync the fingerprint scanner to the motherboard, which means it can safely be swapped without losing functionality. Good luck with the replacement!

I do not think you’ll be able to replace it by yourself, as it is soldered directly onto the motherboard. Look for a shop that can do microsoldering. They might be able to fix it for you.

If you still have your old screen, installing it on your iPhone together with the front cam flex. Home button doesn’t have to be transfered for the phone to function. If it does work, you’ll know that the problem was the missing film. If not, your front camera flex might’ve been damaged while removing it. The sensor is not attached very tightly so it can break off of the cable quite easily.

Check if it’s bent. If it is, your motherboard might be damaged. This isn’t something that you can fix yourself. If it is not bent though, check for water damage. The iPhone 6 and 6+ are not sealed, so they are not waterproof.

See if there’s a way to calibrate the props or motors. Maybe there’s a crack in one of the propellors and it just slightly influences the way it flies.