Porque mi televisor enciende y se apaga después del logo LG?

Hi Pablo,

Thanks for your answer.

Yesterday I unmounted the whole TV to access the back led, and I discovered that my TV is edge-lit, with only one strip of led on the left side. This really looks like bad engineering because my left side is clearly overheating since it needs to light up the whole tv (and this probably causes LEDs to fail)… It would have been way better to have two strips, one on each side to spread the heat and avoid problems.

But anyway, my strip of LEDs is model 42 "V12 Bord REV1.0 5 6920L-0001C, which is made of 60 SMD LEDs 6030 of 6V each.

I first powered up the TV to observe the LEDs, and at first, they seem to all light up, but then about 10-15 LEDs on the low end of the strip shut down, and about 2s later the whole strip shut down. Which is a weird behaviour but ok. Since the whole strip of 60 LEDs takes about 70V to light up (and not 60*6=360V), I’m guessing they are probably divided into 10 LEDs in parallel.

That probably means a bad led somewhere in the low end.

So I proceeded to test them individually with a 5V power source (closest thing that I had), and just one LED would turn on. I’m guessing that this one is producing the failure.

Now I will try to buy a replacement strip from china, and maybe a single LED from a local store since the strip from China will probably end up arriving in my country in 4 months.

I will post again to tell you if the LED replacement ends up working. And of course, I will post pictures document the process.