Hello guys!
I have 3 different laptop with same problem: Lenovo ideapad 100( MB: NM-A681 ), Z50-70 (MB: NM-A272) and yoga 700. all of them power on, fan spinning, power light on, battery charging but no display.
Made some measurement on edp port and i found that +LEDVDD 20v, +3VS 3V, but...