How to repair nokia 5700 white screen

When you switch on nokia 5700, it start and it shows a white screen, but it never shows nokia logo sound, then it shut down.
For this problem :
1. Check your batteray and batteray connector first, replace if needed
2. Check power button / switch on, replace if needed
3. If the problem not solved, check board for water damage, clean board if needed
4. If problem not solved, update your firmware with a newest ( reflashing firmware )
5. If the problem still not solved, maybe it cause hardware failure, trace circuit and troubleshooting.

But When switch on and it shows a white screen, incoming and outgoing call normall, probably your LCD is broken, replace your LCD if needed.