W850i White Screen Flash

[fredrikken]

Hey! Has anyone managed to resolve this problem?
I got this problem too a while ago, the phone was working well but after I woke up in the morning the phone was flashing white every 5 secs, and the same thing happened if I removed the battery and restarted the phone.

I have tried to repair it by flashing main + fs + customization with XS++ and restore my gdfs backup, but I rather think it´s a hardware problem, do you have any ideas of how to tackle this problem?