It's essentially impossible to tell what a circuit board does from just an image; even if you drew a schematic by following all the circuit traces, you'd be guessing as to what it does.

If you know what device it came from, the best place to start is to look on the web for a service manual- sometimes these have circuit diagrams and test diagnostics. It would also tell you what kind of power supply it needs and how the boards are supposed to be connected (assuming these are all from one device? I'm inclined to say they're from different objects).

In your last picture, if you look really close on the square chip in the middle, you should be able to read the manufacturer and identification numbers, that might give you a clue as well. The upper square looks like an LCD display like from a cell phone, but overalll the components look too big and clunky to be from a modern cell phone.

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That first (top) board looks old school to me.

That appears to be a variable cap as used in analog tuners.

That ties in with the obvious antenna on the edge of the board.

Looks to me like you've got an old radio with an analog tuner. 

The bottom board is much more recent, with the surface mount components and large LCD display.

I'm in agreement with Milw, though. You're not going to find out just exactly what it is by posting fuzzy pictures. Look for identifying marks, and web search up a storm. 

As for Angie's advice, you'd be unwise to blindly power up any loose board you happen to find laying around. You don't know the voltage or current requirements. You don't know the polarity. You'd want to find out what it is, what the specifications are, and then use a logic probe or multitester before hooking up any significant power. 

ScottE -- Member (always) & Moderator (when needed)

Sure. You just need to hook up the right power supply to the right video control circuit, which will drive the right signals to the appropriate input pins of the LCD.

That's the generic answer. The specific answer requires the other things we've aleady told you to research. 

ScottE -- Member (always) & Moderator (when needed)

Janemba said: then what is the use of this a

High Capacity 3300mA/H NIMH Battery

That question is like asking what good is an extension cord, if you don't have anything to plug into it. 

The answer is "not much". 

Are you saying that this battery came with one of the circuit boards?

Is it a generic, general usage, rechargeable battery in the shape of an AA battery, or is it a battery pack with soldered on leads or copper pads that fit a specific device?

Is it corroded, swelled, scorched, or leaking? If so, it's junk. Hazardous waste junk. 

ScottE -- Member (always) & Moderator (when needed)

Janemba said: ok, did you ever made something that required a circuit board

 Yes, I'm a microelectronics engineer that has done just exactly that for a living at various times over 25 years. I usually work at the chip level, but have had assignments at the PC board level.

I used to consider it "fun" to put together PCs out of castoffs and mailorder parts. Not so much so, these days.  I treat a PC like a toaster now. You buy it. You use it.  You don't build a new toaster from scratch.

ScottE -- Member (always) & Moderator (when needed)

I'm not even going to say what I have to say because you all have already stated it.

GWJax, To Hack and make mods on robots is a life style and comes natural and not by choice. If a robot has a screw to open it then it must be opened!