brightnes problem

[kintaroo]

hi to all,i have a problem whit my vaio vgnfe11m..
when i turn on the screen it's very dark...if i change bright level the screen become more bright but after 30 second returns dark 😞
what can i do to resolve problem?
😞

[GattoMatto]

And what happend with brightness indicator when your screen become dark? Is it still indicate maximum brightness?