Hey! I bought an iPhone 3GS from my friend for cheap, he said the screen was broken. He bought a new LCD and Digitizer and replaced it but the screen is still mostly white and pixelated. Is it possible that the main board or the connectors are faulty? I'm going to buy a new LCD and Digitizer and would just like to know beforehand so I don't waste any money, thanks! (I can post pics of it aswell) 