I just picked up an audio jack to repair an iPod touch and also replace the damaged digitiser. My issues began after I replaced the jack, the screen was functioning previously up until I soldered the replacement jack onto the board. Once this had occurred the screen now just remains white. I have googled the typical responses but it seems this also occurs when you don't attempt a repair. I don't have a problem ordering a new LCD screen to replace if I have managed to damage something (which I was very careful not to) although I also read that you can damage the logic board because of soldering. Any ideas what it could be and how to determine what I have actually done?