Hi there,
google the names on those 3 8legged ICs and try to find datasheets or at least what they are for.
That way you can find out which IC to "short". But always try to run it on 5v first.
I found the datasheet for the main chip here:
http://www.newhavendisplay.com/app_notes/BIT1612.pdf
For the power part. You had no wires attached? Not a clue?
It seems there are solder points for a button board.
I would guess that those 4 points on the side are for 2 Video Outputs, GND and + but this is only a guess.
You could try to follow those traces and figure out what goes where.
Compare those to other boards to see if you find similarities in where the + traces lead.
Usually GND is easy to spot, since it is connected to more than one part.