well, i hace System Setup:
1. Display Style ( 2 options)
2.Clock
3.LCD set (kinda colors)
4. Language
5.Power Off(sleeptime)
6.Replay mode
7.online mode
8.memory info
9.firmware version
10.firmware upgrade
11.exit
and in non of them was something about swtiching off screen in ... seconds. I am not stupid in computers and stuff like that, but i am confused because i cant find the problem but i found this forum and i hope that i will find the answer.
<edit> here is my firmware.. i hope. i did it first time so..
http://ftp.netgames.lv/fat/dump.bin