TV is making popping sound and fades to black and turns on

Do you have voltage (3.5V) on the PSON terminal when you push the start button on the TV...if you don't its the main board that has failed

Check all source is same or not
Try factory reset.

Sounds like a panel fault. Contact any service technician to confirm. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Screen-shots to defective LCD TV panel is given. You can compare it to that of your TV's, and can make sure.

Find the vertical IC and check for very small cracks on the solder joints of its pins and resolder (approx. 10 Pins). Also check in the same area for a 1 micro farad at 50 vdc capacitor that goes bad and replace it.

Sounds like possibly it could be connection related between any AV/Cable ports. Worst case would be the capacitors of the motherboard leaking. It's possible to fix anything. Just make sure you have the knowledge and the right equipment.

Bulb burnt out most likely, some go fading in and out some pop.

This TV is horrible. I have the same one and not even a year replaced the light bulb twice. Very disappointing for a Samsung.

Sounds like something may be wrong with your cable line might need to have it checked.

So, where are the answers?