Hey Michael, The televisión sounds like it is experiencing a bad power supply board. A common occurrence is for a capacitor to go bad or fuse or diode or resistor. The only way to determine what component is bad is to systematically check each one by removing it and testing it with a multimeter. If you want to avoid that, you can just skip it and purchase a whole new power supply board. Hope this helps.
It could be a number of things. Try using another charger to see if it is the charger that is not working. If it works, then it’s the charger that needs replacing. If it doesn’t work, then it could be the battery.
Sounds to me like something may have been damaged during the replacement or you may just need to calibrate the battery. Often times after a repair of that type some issues may occur but sometimes calibrating the battery helps. To calibrate follow these steps: 1)force restart the phone by pressing and holding down the power button and home button until you see the apple logo appear 2)release the buttons and then repeat step one a few more times. Try five times to be safe. Afterwards try using the microphones again and see if it helps.
Sounds like it is an issue with the power supply board inside the tv. A capacitor or more may be blown out. Finding parts to repair this kind of tv might be difficult to find. I suggest purchasing a new television.
I strongly recommend replacing the port. Sounds to me like there is damage to the port and it sounds like the previous owner probably tried to do some diy work on the phone and lost the very small screws that hold the port in place. If you do relace the port then I would also recommend purchasing new hardware in case the screws are missing, otherwise the new Port will be loose too.
There is a sort of last ditch effort to try and turn on the phone without the use of the power button but there is risk of damage to the phone. It requires disassembling the phone to get the power button soldering points and bypassing the power button with some wire. This will turn the phone on but at your own risk. If you decide to perform this option, you do so at your own risk. I am not liable for any damage that you cause to your phone.
Check to see if the fan is running when you first start up a game. It should turn on to cool down. You mentioned having cleaned it well. Did you open it up and clean out the fan and heat sink with either a compressor or can of compressed air?