IMac 27' year 2010 display brightness problem

Hi
Stumble this problem, hoping someone can tell me if it was the victim and possibly solved as:
I have an iMac 27 'year 2010 i5 processor.
From what month the display has brightness drops when used in brightness by a factor between 1 and 6.
The problem occurs for a split second and every 30 minutes.
If I keep the brightness by a factor greater than 6, there is the problem.
How can I fix it without bringing in assistance?
I have the warranty expired and I have no money for repair.
thanks

What is the model of your LCD display under the "iMac color profile"?

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