Tecra A4 model PTA42E light display turns off

I have a Tecra A4 - 01400YPT PTA42E model after the laptop, after 4 or 5 minutes the screen light goes out, and I do FN + F6 or F7 (more or less light) to turn it back on. This, it is 4 or 5 times, and after that, it will work ok.
One had this problem? I tried updates the bios, but there most recent person! One thing that is strange is that this laptop doesn't have this little button above the screen to turn off the screen when we close of laptop display, because it seems that when we push this little button, and the light goes off!

Hi Rene

If you want to use the options of power management you need to install the Toshiba power management utility. Do you have this tool on your device or have you used the Windows XP power management?
To switch between the modes of use different ca you use the FN + F2 key combination.

Best regards

Tags: Toshiba

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