[Problem] iPhone turns off between 5-60 seconds after turn it on
Ok here it goes
My battery needed to be replaced in my iPhone, so i bought a kit, opened it up and replaced the battery, closed it up (with some dents lol) and used the phone for about an hour and it worked fine, made calls, stayed on while not plugged in, so the battery works.
Now i decide while im at it i want to restore it to the newest firmware, so i do so, then i unlock and jailbreak it
ok so far so good,
but, around 45 seconds later, my phone shuts off, fine whatever i just restored maybe it needs to reboot, turn it back on, turns off after 5 seconds
now whenever i turn on my phone it turns off between 5-60 seconds
Now i acknowledge this may be a hardware problem, and i am willing to open it back up since it will be easy now because i have opened it already
so if you've gotten this far and read my whole post then if you have any idea as to how to fix it or what the problem may be then please share
thanks i really appreciate it.
EDIT: It is a 1st gen iphone
i have restored it twice.