Backlit keyboard does not not on Z400 Touch i7 GT 740 M

Hello guys, I want to ask questions on my keyboard.

first when I tried to upgrade to windows 10 always on backlight, and then I decided to go back again to 8.1.

But when I finished the downgrade, the was'nt of backlit keyboard works even when starting. If vice-versa, the two windows now can not lit the backlit.

So, is there any driver or program that I need to download to activate again the backlit keyboard?

Because of the things that I had:

1 reinstall the Lenovo Power Management driver

2 reinstall the driver of Lenovo yoba management

3 reinstall the BIOS

4 reinstall Windows by using a recovery key (Windows 8 Original)

5 Reinstall driver hot key (by Fn + space)

6. the business Windows 10 64 bit upgrade

7 reset all the BIOS settings

I had read that Lenovo Z400 with 20220 model number does not come with backlit keyboard. But mine came with it, and I never let fall or damage my laptop anyway.

Please help me, I really need the backlit

Thank you very much

adiltako wrote:
UPDATE:

When I play FFXIII, the backlit keyboard suddenly appear! And I heard the HARD drive fan had to be rapidly rotating loading this game, but 6 seconds later the backlight switched off again.
What happenened to my laptop please help me please

As you have tried most of the acts to solve the problem, your only choice is to have replaced KB either by yourself, or by calling Lenovo.

Tags: Lenovo Notebooks

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