MB TopStar H48/H49 standby after 20 minutes

[polidoro]

Hi for all. I have a notebook in my office that after about 20 minutes goes to standby, even if I working in some software. After goes to standby I press any key and it becomes to life, but now it goes to standy about 2 minutes. It´s how it becomes hot/warm, but it only 46º C.

If it be on setup bios it turn off.

Help me, please

PS. I needd schematic for this MB too.