The power and volume buttons should be able to be replaced. They are soldered to the motherboard. A guide to removing the mother board for the 1st gen Shield tablet is below. Nvidia Shield Tablet Motherboard Replacement Also below is a guide for a Shield K1 power/volume button replacement which appears very similar to repair. Nvidia Shield Tablet K1 Volume Control Button Replacement They are both rated Moderate difficulty.
I will agree that iPod batteries are challenging, and if it is more than what you want to tackle it might be a good idea to take it to an expert. Does the device turn on at all? If so, you can sync your iPod with iTunes on your computer to back it up. If you decide to get a new Apple device like another iPod or an iPhone, you can load the backup to the new device to transfer all of your info and playlists. https://support.apple.com/itunes
Many auto parts stores have free engine light testing. They will hook up a tester to the OBD-II port on the car and can tell you what caused the engine light to come on and maybe tell you what you need to do to fix the problem. Many places like Oreilly's and Auto Zone offer this free service in hopes to sell you the replacement parts.
I've seen this issue before. First- reseat the connection for the camera cable. It may just not be connected well. Second- If that does not fix the issue you may need to replace the Camera Flex cable. iPhone 6 Front Camera and Sensor Cable
A battery sitting in a discharged state for a long time is probably the worst thing for the health of the battery. Replacing the battery should probably get you going again if you didn't have any other issues.
I would not recommend rice as a solution. Rice will not remove all of the water (it will just delay the possibility of cleaning the phone properly). The minerals and electrolytes in the water remain behind after evaporation and WILL cause corrosion which BEGINS IMMEDIATELY and progressively gets worse over time. The sooner you can open the phone and clean out the water and corrosion, the less damage will be caused by corrosion. At the very least, the phone should be disassembled and the logic board should be cleaned with 99% isopropyl alchohol. Putting the logic board in a professional quality ultrasonic cleaner will complete the removal of corrosion and is highly recommended. I would recommend replacing the battery as well. I have seen batteries fail spectacularly after water exposure (sometimes weeks or months after). Bulging, heat, smoke, fire! Even that is not a guarantee for full recovery of the phone. Many times the phone is not fully functional even with best efforts of water damage cleaning. But...
The glass on the front of the iphone has a grid of tiny, almost invisible wires inside that can recognize where you touch them. If the glass is broken, some of those wires could also be broken, not allowing the message that you had touched the screen in a certain area to get to the logic board in the phone. Replacing the LCD/digitizer assembly should fix the issue. More info on iPhone digitizers and how they work. http://electronics.howstuffworks.com/iph...
The next thing I would try would be a factory restore. Disconnecting the battery or disconnecting other things without disconnecting the battery can sometimes do funky things. I have not worked on a Sony but I have had similar issues on other android phones and doing a factory restore sometimes restores network connectivity after repair when no physical problems with the antenna, etc, can be identified. Be sure to backup any necessary pictures, contacts or files first since a factory restore erases everything and puts it back to the way it was when you bought it new.