Chinese 3,5" died. Any suggestions?

[meffcio]

A few months ago I bought a flaxty chinese TFT LCD screen just like the one here:
http://cgi.ebay.pl/3-5-TFT-LCD-Play...2694?pt=Auto_TFT_Monitore&hash=item3a65b03ff6
Since I didn't have any manual for it (I wanted to know the psu pinout by experiment, so) I probably reversed + and - of psu for a Dang while (<1 sec), but when I connected it properly, screen just flashed in grey colour for a moment, and now it doesn't react to anything.
Is the screen that chinese that it breaks in the blink of an eye? Do any of You know how to fix that Playstation?
Please, MTV, pimp my screen!

P.S. Everytime I tried anything with it, I didn't connect it to any signal source, but I heard that then it will just show a blue screen. Correct?
And nope, I didn't register here only to ask that question.

[EDIT]
Sorry, I made a mistake. It flashes from time to time when trying to run it. And after a flash it's dead black.

 

[Noah]

Yes, most screens will show a blue screen without a signal, or when it's searching for one. I'm 80% sure you are going to have to get a new screen.

 

[bud]

None of the current eBay screens display a blue screen without a signal. It'll just be a blank screen until you feed it video.

 

[Noah]

Huh, mine does. Says Analog 1 on a blue screen, even if you have a connection, then it will boot to whatever's connected.

 

[meffcio]

Argh, I'm a dick. As budnespid suggested - when there's no signal, the screen is just black. I connected my NES, and... everything worked. Now I only need a noac and a really tiny sound amp.
Sorry for this stupid problem, and thanks for help.
You may close the topic.