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| Why do backlight LEDs burn out and go blue? |
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| eti:
--- Quote from: IanB on November 06, 2021, 01:00:22 am --- --- Quote from: eti on November 06, 2021, 12:49:59 am ---There seems to be a lack of understanding with others in this thread about exactly how white LEDs manage to emit white light --- End quote --- No, there is a lack of understanding by certain people in this thread about how to diagnose faults. You have a probable cause, even a very likely cause, but you have not proven it to be the case. Especially since you posted a picture of a blue screen, but now you tell us it is not actually blue, but a kind of purple-hazy. I'm seeing a pattern of you creating antagonizing threads, which means you are going into my ignore list. Goodbye. --- End quote --- Wow. Okkkkk then. Blue, purplish blue, purple, whatever - what’s the difference? When a WHITE LED is meant to be white, splitting hairs over the shade of purple or blue that it’s clearly not meant to exhibit, might actually show that the antagonist is someone else. Ignore me if you wish, you’ve not helped the thread and clearly just want to storm out in a temper and make a flourish. Great. I wasn’t asking IF the LEDs are the wrong colour, I asked why they go that way. 🤦♂️🤯 |
| eti:
--- Quote from: amyk on November 06, 2021, 12:28:34 am ---That doesn't look like the backlight, but rather (two!) missing channels of video data. --- End quote --- Thanks for the reply. Actually one can see the LEDs glowing this bluish purple through the grilles in the back of the set. Also the camera puts a very blue cast on what is, in actuality, a more purple hazy screen. Looking past the "purple haze" one can see all the RGB data is present, as it's colour with a purple overly - it's nowhere as exaggerated as in the photo. |
| amyk:
I think you're being met with incredulity because that is an insanely blue photo you've taken, and while a few bluish patches would be clearly phosphor degradation, they must've really messed up a whole batch of LEDs for them to all go bad like that. If you open it up and show the backlights themselves, that would clear up a lot of the disbelief. "Roses are red, violets are blue so are these LEDs but they can't believe it's true." |
| bdunham7:
Here's my TV in blue mode. It has no LEDs. The picture is pretty close to the way I saw it and I've never seen an LED-backlit TV look anything remotely similar. Like the OP, the only visible light that isn't blue is a reflection. |
| eti:
--- Quote from: amyk on November 06, 2021, 03:03:28 am ---I think you're being met with incredulity because that is an insanely blue photo you've taken, and while a few bluish patches would be clearly phosphor degradation, they must've really messed up a whole batch of LEDs for them to all go bad like that. If you open it up and show the backlights themselves, that would clear up a lot of the disbelief. "Roses are red, violets are blue so are these LEDs but they can't believe it's true." --- End quote --- I've no desire to "prove" it to one bloke who's gone off in a tantrum and blocked me. Meh. If you Google the symptoms it's EVERYWHERE and extremely widely known re LG LED backlit TVs. If that bloke can be bothered to form a pedantic reply on a forum, he can at least use those typing fingers to do a TRIVIAL bit of research for about 5 mins. |
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