I've never tried to power a phone on with no battery in it, so I don't know.
Unless you try another battery that you know is good like I mentioned in previous post, you're stuck in limbo not knowing whether it's the battery or the PCB. If it's the PCB, your phone is nothing more than a useless paper weight.
Edit:
Don't know if all phones are the same, but just tried an old crappy phone I had lying around with no battery. I plugged it in and it powers on completely without the battery.