No backlight and brightness on my Satellite A300 -1BG

Hi,
I have a A300 -1BG Mdoel PSAJ0E-014013CE with Windows XP SP3 and BIOS V2.70.
I can see the display but very low brightness, I think backlight is not working. When using direct flash light diract to the screen I have tried the following:
Brightness is not working using keys Fn+F6 or Fn+F7.
I have tried to change power profiles setting brightness at maximum level 8 in any power profile
I have reset default values on BIOS
However all of these attempts failed to get the backlight/brightness right.
I have seen in these forums other problem related brightness but I am not sure. I need some guidance.
First, I was trying to get my BIOS up to date, but the info related to BIOS updating for this laptop type is now on releases over V4 and I could not find the procedure or release notes how to upgrade my old BIOS V2.70 to new ones. Any help?
In any case I am not sure what should I do to recover the backlight...unless is a hw problem but I want to discard everything before making this assumption.
Any help is very welcome....
Thanks
jm

Hi
To be honest I doubt that this could be an software problem.
For me it sounds like FL inverter issue.
FL inverter is a small part which controls the display backlight.
If its faulty, everything on display will appear like behind a thick fog.
I think the notebook technician should check this part and if needed this should be replaced.

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