@dillanmchendry a Tape-Off "I have seen “fixes” on YouTube etc. for a similar issue which uses electrical tape to cover" will not work for this issue. With this" the tv turns on as normal" are you saying it works as normal or just that it does not loop. So, it turns on and stay on. All of this sounds like your Samsung is having trouble with the POST (power on self test) and that it is why it does the looping. Since you pretty much isolated the T-con board. Let's look at that. Post some really good pictures of your boards with the question.
Now, disconnect the T-con board from the Panel. Remove the ribbon cables that go to the LCD driver boards. Try and see what happens now.
We do need to know the exact model for your TV so we can do a bit more digging regarding schematics etc.