Yes, it can be done but it requires some soldering skills. If the volume is very low, then most likely the filter is all clogged up, the black mesh between the speaker and your ear. Open the phone, disassemble the proximity sensor flex (3 screws), and clean the filter with an old toothbrush and some isopropilic alcohol. The best way to know if it is clean is holding it up against some light.
Can you put the iPad in restore mode? Try to press the power and home buttons at the same time for about 20 seconds, until you see the “Connect to iTunes” screen. If you can do this, most likely a factory restore via iTunes will solve the issue. If you cannot put the iPad in restore mode, then the problem is way more serious and very likely in the motherboard.
Yep. That’s a transformer. Blown up. You can replace the entire power supply board. Look for it on eBay with your TV model or a number part that’s somewhere in the power supply itself. I cannot see any number part from your picture.
You can try with some thin tweezers. Start on the sides that DO NOT have the pins connecting to the motherboard. From the orientation on your picture, that would be left and right, not up and down. It should come out fairly easy.
Just yesterday an HP laptop dv5 came to the shop with this exact problem. Caps Lock blinking 3 times. Turned out to be that one of the RAM SO-DIMMs was bad. I suggest you try to boot the computer up with some other RAM, as long as it is the same type and speed (PC3-10600, for example).
I just solved this issue! The problem is not that the screen is "somehow" rendering the proximity sensor useless, the problem is that, if you look closely enough, you will see that the transparent holes on the screen that the proximity sensor use are not "centered" in the socket. Therefore, the proximity sensor is not working. With a sharp point, remove the holes (not all the way to the edge of the socket) and paint with a black permanent marker. The proximity sensor works again! Surely, this relates to poor manufacturing!