A new from the factory E420 came with a dim backlight. After trouble-shooting and finding the problem to be intermittent, the solution had to do with the routing of the lcd cable to the display plug under the keyboard and bezel shield. By pressing on that area the dim display would blink from bright to dim. By untaping the cable and backing it off to the left and retaping the intermittent display problem was corrected.
Thanks for posting your fix. How about marking your post as solved so it's easy to find again?
_______________________________________________________ T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro Did someone help you today? Press the star on the left to thank them with a Kudo! If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! If someone helped you today, pay it forward. Help Someone Else! English CommunityDeutsche CommunityComunidad en EspañolРусскоязычное Сообщество