W850 Screen goes white

[oleq83]

Hi Friend,

99% of this type of problem is H/W , change the upper Keys board
and your problem will be solved .

It is not Software problem ..

I have fixed many W850 flashing white screen .. by changing the upper keys board and sometimes the Flat cable too .

Thanks a lot for the reply. By the "flat cable" do you mean the flex cable that runs between the two sliding parts?