TV/Monitor Shows Image After Hours' Break, But Nothing When Turned Off And On

[t4akawolf]

When powering on from being in the off-state for a few hours, my Samsung MU6470 123cm (it's a TV but I use it as a monitor) works fine. Picture is good, everything is normal. But when turned off and turned back on in a short period of time, nothing. No image. Just the backlight.

This seems like a very peculiar problem to me. Unfortunately, it's only the most recent in a slew of problems I've been having. In fact, I had dropped it off the at a local service center because of the following issues just two days ago:

1. Just one week after the warranty period ended, it started having this dark column on the left (close to the center) side of the screen. It happened with no warning. A suddenly present vertical patch of darkness, focused more towards the bottom (please look at the attached picture). I still had image, though, so I ignored this for a while.
2. But then a few day ago, I turned the thing on and it just started flickering randomly. No image, just grey to black, random flicker. This is a video of that issue.

The service people were able to fix the first problem by replacing the LEDs under the screen. But after doing that they're now facing this "The TV needs a break if you want it to work" issue. They don't know / aren't sure if this is still Problem #2 mentioned above, just presenting differently because the LEDs have been fixed, or if it's a new problem entirely. But they seem to be implying it could be a problem with the panel itself, and that would cost me a bomb to replace. I really don't want to get ripped off / tricked into spending so much money unnecessarily. And this isn't just paranoia, I've heard stories about this place from friends, but it's the only Samsung service center anywhere near where I live so I have no choice.

I would love to have you guys’ insight. Please help.

 

Also, they described this problem to me over the phone. I'll try and get footage of it when I go there in about 6 hours.

[Cyracus]

Sounds/looks like one of them planned obsolescence things right there.
Gut feeling on this one says another component failure is causing the light issue, may be better to replace it if a smoking gun can't be found...

[t4akawolf]

2 minutes ago, Cyracus said:

Sounds/looks like one of them planned obsolescence things right there.
Gut feeling on this one says another component failure is causing the light issue, may be better to replace it if a smoking gun can't be found...

But which component? Could it be the panel itself, like they're suggesting? Or could it be like the power board / main board etc?

[Cyracus]

2 minutes ago, t4akawolf said:

But which component? Could it be the panel itself, like they're suggesting? Or could it be like the power board / main board etc?

I would need posession to disassemble and inspect to have any hope of knowing. My gut tells me a poor solder failed somewhere in the brain junk, but I'm certainly no expert so grain of salt and all.

[t4akawolf]

11 minutes ago, Cyracus said:

I would need posession to disassemble and inspect to have any hope of knowing. My gut tells me a poor solder failed somewhere in the brain junk, but I'm certainly no expert so grain of salt and all.

So not the panel, something on the main board/power board instead?