MacBook Pro 15'' mid 2010 screen gets suddenly black

Hello guys,

I have a MacBook Pro 15'' mid 2010 laptop. The LCD works normal, clear colors etc, but sometimes, last time more often, the screen just gets dark suddenly. I can hear the sound normally, but LCD is black. I do not think the LCD is the problem, maybe a cable, or something else.

I have to restart it 2-3 or more times the laptop, and after a while works well. Sometimes just pushing the mouse pad is enough.

May I know how to find what the problem is, and how to fix it?

Thank you.