One of my Samsung monitors a S24B300 was behaving strangely for about 6 months or so now. When turning on, the back light was flickering for about 30 seconds or so, after the monitor was roughly ~ 2hrs on STBY. It wasn't a on / off flicker, more like a erratic brightness of the LED back lights, like a candle around air flow. 
It drove me nuts enough today, so I decided to repair the issue.
I replaced the HDMI cable and checked the PSU and ended up with no improvement.
So after opening the sucker up, there was absolutely nothing to see with the eye. Bad capacitors? You bet! There are two electrolytic SMD capacitors C806 and C807 (50V 10uF) that are in series and feed the LED back lights (on the top left in my picture). Those caps had a high ESR value, so I changed them out to Nichicon PW series of the same value.
Happy to report, the back light flickering is gone.
Another one saved.
It drove me nuts enough today, so I decided to repair the issue.
I replaced the HDMI cable and checked the PSU and ended up with no improvement.
So after opening the sucker up, there was absolutely nothing to see with the eye. Bad capacitors? You bet! There are two electrolytic SMD capacitors C806 and C807 (50V 10uF) that are in series and feed the LED back lights (on the top left in my picture). Those caps had a high ESR value, so I changed them out to Nichicon PW series of the same value.
Happy to report, the back light flickering is gone.
Another one saved.
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