1)Hard reset your Nokia c7, is a quick and easy solution.
2)Update the firmware of your Nokia c7 to the latest firmware version, using Nokia Software Update and a usb cable. You older firmware can become faulty and could be the cause and the reason why your Nokia c7 is displaying a white screen. If there is no new firmware available from Nokia, then reinstall the same firmware onto the mobile phone.
3)Replace the flex ribbon cable.
3)Replace the LCD screen because it could be faulty. Make sure you buy a genuine screen from Nokia and don't buy cheap fake screen, because of the cheap price. The reason why i say it is because they don't last as long as a genuine screen. Below this text, is a excellent blog post, which has a excellent video showing you how to replace the LCD screen.
How to Change a Nokia c7 LCD screen
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