If you are trying to install your iPhone or iPod digitizer and it is displaying is a white screen, please try the following troubleshooting method:
Gently lift the battery connector and leave the battery disconnected for 30 seconds to 1 minute to ensure that the phone is completely shut down and ready to accept the new screen. If the white screen appears again, repeat the process and wait a little longer with the battery disconnected. Please be careful when removing and reconnecting the battery as the connection prongs can become worn out from overuse.
We have found this method to be successful when testing parts here in our warehouse. Please try this method first, it may take as many as 3 times of removing the battery for the part to start working on the device.