W800i White Screen of Death

My phone got the white screen of death for the 3rd time yet again...
I would like to know if it is possible to repair it by myself
Is there any guide that helps fixing this problem?

I have tried the following:
Cleaned the connections
Removed SIM Card and Memory Stick to see if there was a problem with them ( I removed them for 2 whole days)

Please I do not want to give it again to Sony Care because I will lose my contacts list and pay them yet again..

Please help me...
Thanks in advance

PS.) I would greatly aprreciate it if someone directs to me to a guide for fixing W800

backup your GDFS and them flash it .XS++ is recommened.

Try to delete files from phone memory. Keep as much phone memory as possible. transfer all the games to mem card via "more" option

contacts is on GDFS.so read GDFS send to me and i will extract them ( using SEtool dongle version )

flash it, ( use GFlash20b6)