The backlight of my notebook was no longer working, finally I took it apart and checked the fuses on the motherboard (FRU: 44C3928):
F7 was blown, I will put in a new 3A type. Littlefuse´s 433003 is now obsolete, but there are replacements.
For reference and because I could not find a good photo of this specific model, here is in 3002 x 2432 (3,5MB JPEG)
