Why is my TV flickering?

the problem is in those boards

Flickering can occur by many reasons. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Suspects its main digital board. But, before a replacement, contact any service technician, and make it sure. This board cannot be replace by the user, as, there might be a software update necessary after replacement.

hello,
I've watch your problem on youtube , that problem can be from main board. But to make sure main board problem, you should check without inputs first. Unplug all input (HDMI, Component, AV in, PC).
Than turn on your tv again. If that conditions still appear, i suggest you to call samsung technician to repair it.
Good luck.

Take out incomming signal input,recheck.Put input back,same problems.Than ur Main Tuner Signal board is the cause.

convergence board

Try turning off your Energy Saving option. (mine is in Menu --> Setup --> Energy Saving).  See if that helps.

Please recheck component connections in both units and make sure to hook up them according to corresponding colors like blue to blue, red to red and orange to orange.

This tv has a 3 board video path. Analog main pcb --->Digital main pcb --->DMD pcb. see which inputs have the problem to narrow it down. if only some inputs, suspect analog board. if everything flickers(all inputs and menu), suspect the dmd or engine. you can see the lamp shine out the back. if the lamp is flickering, suspect lamp or ballast.

The fact that this is on all inputs suggests that teh screen is faulty, i would bring it back and get it replaced.