Top, middle of screen there is a constant flicker. The flicker starts at the top, middle and goes about half way down the screen.

half the picture on my tv screen turned completely white. ' IGN ...

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IGN
May 3, 2014 - 7 posts - ‎4 authors
what half? down the middle or every line of pixels? did you google the issue with your tvmodel? my samsung has issues with bad capacitors ...

samsung led ua40d5000 tv half screen turning white - Forums - CNET

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LCD TV Samsung LN32C450 top half screen problem ...

? 3:58
https://www.youtube.com/watch?v=SawMHKpsYOA
Jun 8, 2015 - Uploaded by Vladimir P.
This is for my Samsung LN32C450E1DXZA that is having major image issues with the top half of the screen ...

Samsung ScreenTartan/Plaid Pattern on top half of screen ...

? 1:22
https://www.youtube.com/watch?v=ue9IQwj7CVM

If your LCD TV or monitor has stopped working, or is displaying one of the following
symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can
examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life
of your monitor or TV by several years.
Check the cables, connectors and connections.

Looks like either a TCON board failure or if you are lucky it could be a flex cable connection problem at the TCON or Main board.

the HDTV has a heat-related problem check your fans. Do they remove heat? the vertical chips paint the screen from top to middle and, middle to bottom so; your top to middle vertical chip is overheating as is your video chip; that is why you have "glitter" in the back ground. get rid of the heat or, bye,bye TV.

If you take off the front bottom panel of the tv wich is easy. Then you will see 6 tuning knobs at the bottom middle of the tv .the top 6 control contrast for the lights dont mess with those. the bottom 3 are the power to each light.red is bottom left if your screen went blue it makes sense that the red is starting to go but if you turn down the power to it left 1/8 turn it should fix it for awhile .Its easy.

Your power-inverter board needs an overhaul.
Probably in need of the standard capacitor replacement.
OR
a bulb in the screen is bad (a bad bulb will usually show symptoms)
It will flicker, or will look pinkishish for a bit or dark in the middle top or bottom of the screen.
ebaysbammbammfran

Uh-Oh.. Sounds like the BGA RAM in the video circuit. (These units are Intel based and Core 2 duo if posted correct).. We can repair if you need help and its under warranty and sorry its not a home remedy situation..

ikenfixit.com

Inverter board is bad or video cable loose either behind LCD panel or near video adapter.

CHECK C2C52 10 UFD @ 50 V OFF THE BASE OF Q2C51 ON THE SIGNAL PCB. 2. CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01 AND IC2P01 PART # 270P466020 (9-VOLT REGULATOR). BOTH ARE ON THE SIGNAL PCB.