Question Lenovo Yoga 500-15IBD screen backlight turns off when unplugged

Nov 2, 2019
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Hello!

New guy here. Seeking for help. Tried to sign in to Lenovo forums and got banned for nothing :D

To the problem. Laptop has this strange problem, any time you unplug it, backlight turns off completely (not dims, but completely turns of). You can see that screen is working though. When plugged in, backlight kicks in again.
I know older laptops had DC/AC inverters for luminescense backlight bulbs that were failing. This probably doesn't have one as the backlight is LED.

Any ideas where to start looking for problems? It's purely HW problem, same happens even when you are in BIOS so not a Windows problem.

Thank you for any information!
 
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