Flickering Area On The Screen

If you look along the bottom you can see a grey horizontal bar besides the vertical bar. This horizontal bar is a timing issue of the signal that is drawing the image.

The placement of the T-CON board which creates the signal is located at a hot location between the two heatsink radiators and there fans. So heavy processing loads as well as dust & debris clogging the cooling system tend to cook the T-CON causing signal drift.

Cleaning the fan blades and the heatsink radiator's fins can reduce the heat to stagnate and speeding up the fan's RPM can expel it. Then lastly making sure the vents aren't blocked. Sadly, often times replacing old the display is required to fix it ones it gets bad as the T-CON can't be replaced on its own.