This problem is caused by what I beleive is a the dimming circuit. Most TV's will dim the brightness output in a dark room and brighten in a well lit room. There is a circuit that does this for you, and this circuit gets faulty after a year or so, (Bad capacitors probably) Samsung is aware of this problem and there is a fix. Just open up the back of the TV and cut jumper on the power supply (Upper right as you look from the back of the TV) named JP852 on the 46" and JP852 on the 55". If the jumper is not labelled as such. Do not cut it. To check if this fix will work for you. Go into your settings and turn picture to eco mode (economy mode) and the picture stop flickering will stay solid for about 20 mins. If this is the case.. Go ahead and cut the jumper. This procedure takes about 10 mins.. Here is a youtube video on how to do this https://www.youtube.com/watch?v=i-jQZ-TQdgU
You can adjust this. The procedure is called flicker adjustment. But, you have to enter its service mode to do this. To get more details, http://electronicshelponline.blogspot.com/ Pull up older posts.
SOURCE: LCD TV SCREEN PROBLEM RED HORIZONTAL LINES OF DOTS ALL OVER SCREEN PLEASE HELP
This should be repairable. It may be the LVDS Cable or the Main board problem. The only other problem is the T-Con Board.
SOURCE: 46 inch Samsung TV that just clicks but wont turn on
I just fixed this very same problem. It is the capacitors are the problem. However, I think that if you have some minimal skills with soldering, you can fix this yourself. You just need to take out the system board, then the power supply parts are on the top right. The bad capacitor(s) will be bulging at the top and possibly have some brown stuff coming out. The ones that go bad are 1000microfarad, 10V, however you can replace them with higher voltage. I got 35V caps from radio shack for 1.59 each. You just need to solder out the bad ones and then put the new ones in and solder. Remember that the negative end goes on the side with the bold black part of the circle on the system board. Then just cut off the extra ends of the capacitors. If you are capable of doing this yourself, you will spend at most 6 dollars instead of however much a technician costs.
SOURCE: Samsung ln t4661f picture issues.
We have the same problem. I am afraid it is a defect that is occuring in the samsung tv's
SOURCE: Samsung 46" LCD LN46B650 started showing vertical
had a very similar situation with my Phillips 42 in. LCD TV.
Here was my Problem. The Power Supply Board. I opened it up( Warranty
was Expired) and found several faulty capacitors on the PSB. Its
pretty common. Major Electronic companies were sold faulty capacitors
that fail in 2-5 years instead of 10-20 due to a lack of
preservatives. It wouldn't surprise me if you have the same problem.
TV will work fine for a few years and then just fail completely or
slowly deteriorate.
Here are the solutions
1. Have it Repaired
2. Check for faulty caps and if you find some(budged or leaking) you know you have located a problem
Remove the board and replace the whole thing.
3. If you have some soldering skills you can replace the faulty caps.
Caps are very inexpensive, under a dollar in most cases. I replaced 4 for about $5.00
Hope this Helps.
Good Luck
SOURCE: screen has started to flicker constantly. tv is
The power supply needs to be replaced. In some cases you can turn down the backlight level and the flickering will stop.
,Pioneer, Hitachi,Mitsubishi,Zenith and others. 
You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull
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