Hello everybody. I registered in this page because i need some help

. Sorry if this don't fit in this forum.
I have a generic mp4 "Players" 4 gigas. The processor microchip overheats. First issue, the mp4 doesn't turn on, so i changed the battery. Works well, but i noticed that the mp4 micro overheats. I desoldered the battery and connected it to the pc. If i touch the micro for 2 seconds it hurts. Also searched any cut circuit.
What goes wrong??
Thank you.