Dell Laptop display pins?

[hephaistos]

So, I would like to replace my broken laptop display on my dell latitude e5550. However, I don't know exactly how many pins my connector has. Because I heard there are 40 and 30 pin connectors, but never found a 40 pin screen online yet. But when I asked a seller on eBay he said I should determine by some model number on the back of my screen. But there isn't. What could I do?

 

[kenzy9]

I should determine by some model number on the back of my screen.

Have you physically dismantled the LCD screen to see? It's usually on the back of actually screen panel, not the laptop cover.