So which is it, exactly? Is it the WSOD, or flex cable? WSOD is software related, where the phone just stalls. The flex cable is just that, flex cable. If you can still receive calls, even though the phone has a white screen, then more than likely t is the flex cable. However, even a minute damage in the cable can make it nonfunctioning, where sometimes you may not notice it. Just buy a new flex cable and replace it. Just be careful when installing the new one and take your time.