Question Samsung Laptop Black display but everything works fine

Sep 15, 2020
Hi, I haveSamsung NP-R522H When I turn it on It doesn't display anything, RAM/FAN/HDD/POWER/BATTERY All Are fine and working good I tested their voltages and they seem good
What i've tired:
  1. Re-program BIOS Card
  2. Removed battery
  3. Replace ram
It still won't display anything