Samsung TV red standby light blinks twice, TV stuck in boot loop

@satishkuma73529 @chrisinsley and all on here. So, there is a lot of stuff going on here. Lets try and refocus on this issue. We all know that the larger Samsung TV with the NU designation, has a lot of panel issues. You will still have to do the common check to rule the panel in/out. So start with your power board. Unplug your TV. Remove the back panel (it's a beast because of size). Now disconnect the main board cable from the power board. Now plug the power cable into the power board. this should turn the power supply on and your back lights should come on. you can see those through the holes in the metal of the LCD panel. If they do, good. That means power supply is A-Ok. If not, bad= power supply.

Next, disconnect the power cable. Reconnect the main board. Disconnect one of the ribbon cables from the T-con board to the LCD driver boards.. Those are the "long , skinny boards" that connect directly to the LCD panel. Now turn the TV on. Let us know what happens. Turn the TV off, disconnect the power cable. Reconnect the ribbon cable you disconnected and disconnect the other one. Reconnect the power cable and turn your TV on. Let us know what happens. What you should expect is that at least on side will let one half ot ht eTV panel work. That is why it is important to know what happens when you d/c those cables. One at a time and always disconnect the power.

Ultimately it does sound like a bad panel (LCD driver board. There are no schematics for those, nor are they replaceable by the normal DIY'er, due to the process with which they have been fastened to the panel. The only thing that one could try is a Tape -off. This only works about 3/4 of the time so there are no guarantees. It only works if it is the panel that has failed. It will not do anything if this is caused by a bad T-con board etc. Since nobody has posted any pictures of that, we can not mark test points for voltage checks on that. The larger the panel, the more LCD driver board your panel has, the more difficult it is. If you have more than 1 driver board per side, you will have to disconnect them as well and check those the same way as you checked the ones coming from the T-con board. Disconnect power, disconnect ribbon cable from one driver board to the next, reconnect power and turn on. Results? Anyhow a bunch of pictures would make a difference in explaining this. Anyhow, here are some examples of how to perform the Tape -Off.

https://www.youtube.com/watch?v=pfrRhw7-...

https://www.youtube.com/watch?v=zGAVbMQr...

https://www.youtube.com/watch?v=atNmhu7H...

Here is the ribbon cable with the piece of tape

Here the screen starting to turn magenta

Here completely purple after a few minutes

I've been wondering if it has anything to do with temperature, because the LCD does get relatively warm after a few minutes of being turned on (which it can't when it's boot-looping because it doesn't stay in long enough). If I turn the TV off, and back on right after that, it usually turns on fine. But if I let it cool down it usually doesn't turn back in.

same problem two blinks and tv booting on and off both boards changed no luck i removed the ribbon that separates the left from the right cleaned off the terminals with an eraser and low and behold it started to work maybe dumb luck

I just had this same problem. I tried unplugging the tv, holding the power button, and changing the outlet. Surprisingly what worked is taking the batteries out the remote then holding the power button on the remote for 15 seconds while the batteries are out. The tv then turned on fully. Hope this help someone.

My TV is missing power button four yrs ago it broke and since we been turn it on using the the remote . Then all of a sudden I think my girl tried to put a movie from phone afterwards TV kept blinking once then twice trying to stay on ,but no luck ..I even tried a new power plug .... What do I do now ?

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It can sometimes be a backlight problem too.. I jxt encountered some.. and also about the panel too disconnect it's ribbon cables and see if the TV turns on then connect it one by one to see.

Same here... Worked with the remote after i removed batteries and pressed the power button 15 sec.

It apperard some small horizontal lines, that is a defective LCD panel about to die, or what issue is causing this simptome?