Sorry but testpoint requires the phone to boot, what you want cannot be done.
It is jtag you need, and it is an heavy science and long time experiments for such a phone revival, you can try it if you want, look at this for an nice overview of what is needed

(muhaha....):
http://events.ccc.de/congress/2009/F...s/3670.en.html
Only thing is to find an a910 with a broken screen or any other hardware fault than a mother board fault, and repair the 2 phones to make one, if you see what i mean.
This phone is much probably dead if nothing is displayed on the screen.
(i assume you don't only need to charge / change the BATTERY!!)