Problem with matrix/screen in Qosmio F55-Q502

Hello
For a few weeks I have strange problem with matrix/screen in my laptop.
The matrix flickers very often - no matter if power cable is plugged or not.
The screen is full bright and suddenly it starts to blink - it is getting darker, than lighter, usually for few/dozen seconds. It does it when nobody touches it or when I work on it.
It very annoying and making eyes tired - it does it very quickly and there are few levels of screen brightness.
Moreover sometimes the screen turns off - You can see what is on desktop but the screen is very very dark (but not blank or completely switched off). It happens without any reason - sometimes just in the middle of working, sometime for example when I touch (not pull) the power cable between laptop and power supply.
Then, the only way to get back to normal brightness of screen id to close the lid just for half a second and open it
- matrix lights then normally, but can "turns off" moment later and I must do it once again - sometimes even few times..
After "action" with lid screens seems like nothing ever happen..
Does anyone have idea what is the cause of such behaviour or how to diagnose it in details?
Or maybe solve this problem?
Best regards
300m

Sounds like the Backlight or Inverter is failing or there is a loose connection.
Is the unit under warranty? Send it to an ASP for repair.
You should avoid repairing it yourself, the backlight is very high voltage!

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