HP Elitebook desktop flickering(what is the cause)

[levak]

Hello!

Desktop on my notebook started to flicker.
I cleaned the pins and connectors on the board and LCD panel but problem still persist.
Where could the problem be?
Flat cable?
Inverter?
LCD panel?

If I plug an external monitor, everything is OK.
Also, everything is much better if I raise brightness to full power(video is shot at 20% brightness).

Video of the problem:
http://www.youtube.com/watch?v=A4DtltlykWM&feature=youtu.be

lp, MAtej

 

[Jorona]

Bad LCD Cables is my guess