Acer 8920 Back light problem

[KFB]

My Acer Aspire 8920 goes dark after a few seconds. I can use the FN + F6 to bring it back for a few seconds. Ihave tried the inverter driving another tube with the same result. The on period can be extended sometimes by turning the bright ness down. Turning the brightness up to full, turns off the backlight immediately. I have re-loaded the Nvidia drivers, purchased a new inverter from Acer. Problem is still there. Any Ideas?

 

[KFB]

I have found the problem. I plugged two identical tubes into the inverter and it ran continuously for many hours.
Disconecting one would create my fault (a few seconds of run time after being enabled). By using one external and one original and swapping, I was able to prove which tube was likly to be giving me the problem.
I then dismantled the screen to access the original tubes and sure enough one is not working.
I re proved the fact that the two both have to run to keep the light on. At this point I am looking for a local supplier for the 410mm x2mm tubes. I see there is someone on the net selling 3mm tubes, but I'm not sure if they will be as good as the originals.
Also looking to see if I can get a good LED replacement. It would appear that I have found the disadvantage of having such a large screen.

BTW I got an email from Tomshardware to say I have had an answer.

"We've noticed that the question you asked at Tom's Hardware received a reply, but a Best Answer hasn't been selected yet. Was your issue resolved? If yes, please help show your gratitude to the user who helped out by setting their response as the Best Answer. This also helps people who have the very same issue you did find a solution to their problem."

Blowed if I can find it.