Hey Guys,
So, I was working on a custom USB-HOST project, in which I communicate and provide power to my Android phone. Unfortunately, out of the blue, my blue led started to stay on. I tried loading various non-USB projects and couldnt control the blue LED (PQ4). I then measure the voltage on the pin and observed 2.2v on the pin even when I keep the reset button pressed. So, at this point, I think my microcontroller is damaged and need to replace it.
So, the first question is I need to find answer on my own is how did it happen! I can only assume that somehow my phone outputted voltage to the board! Though, arent there any safety measures implemented on the board? My only external connection to the board was just the USB cable!
Next and the most important question is how do I go about changing the microcontroller on the board (unfortunately its the BGA packaging and need to be done by professionals)? is it doable or worth trying? or Does TI offer any services like that?