Dim display.. Inverter or new display ?

Hello everyone. My display suddenly went dim three days ago, but i could see the icons, when i used a flashlight to the dim display. Suddenly, it worked fine fews hours later, and there was no problem in the weekend, but suddenly the problem repeated today in the morning, and there was suddenly light on the display again after few hours, but now, it went dim again. 
I don't really know the reason to this problem, because im not sure of the problem comes from the inverter or the LCD backlight.
Thanks in advance
Oesen

Hi, Oesen
Does this happen both when plugged into AC and running off of the battery? Also, what is your machine type and model and what operating system are you running?
Thanks in advance,
Adam
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