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| Why do backlight LEDs burn out and go blue? |
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| bdunham7:
--- Quote from: eti on November 06, 2021, 12:40:45 am ---I have another spare TV with led backlight (JVC) - would the LEDs be the same if I desoldered the working JVC ones and transplanted them onto the backlight strips of the LG? --- End quote --- Unless they are the same size and voltage--the LEDs are in series--no. If you really do have the worst case of blue tint imaginable, then there are places that sell replacements. What model is the TV. |
| eti:
--- Quote from: bdunham7 on November 06, 2021, 12:50:22 am --- --- Quote from: eti on November 06, 2021, 12:40:45 am ---I have another spare TV with led backlight (JVC) - would the LEDs be the same if I desoldered the working JVC ones and transplanted them onto the backlight strips of the LG? --- End quote --- Unless they are the same size and voltage--the LEDs are in series--no. If you really do have the worst case of blue tint imaginable, then there are places that sell replacements. What model is the TV. --- End quote --- Actually it's nowhere near that blue in reality - more like a mid purple haze (makes sense as it's UV). The TV is an LG 43uj630, and I've found the strips but would like to try the free repair first 😁 Thanks mate. |
| bdunham7:
--- Quote from: eti on November 06, 2021, 12:49:59 am ---Yes, the bright spot upper left is a reflection. There seems to be a lack of understanding with others in this thread about exactly how white LEDs manage to emit white light - it's UV light which strikes a phosphor and that causes the phosphor to emit white light (I forget the physics term). --- End quote --- Luminescence. And it's widely known. It's just a bit unusual to see white LEDs go that bad and still all work. Perhaps they run too hot? Was this used as some sort of static display or just someone's television? |
| IanB:
--- 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. |
| eti:
--- Quote from: bdunham7 on November 06, 2021, 12:58:30 am --- --- Quote from: eti on November 06, 2021, 12:49:59 am ---Yes, the bright spot upper left is a reflection. There seems to be a lack of understanding with others in this thread about exactly how white LEDs manage to emit white light - it's UV light which strikes a phosphor and that causes the phosphor to emit white light (I forget the physics term). --- End quote --- Luminescence. And it's widely known. It's just a bit unusual to see white LEDs go that bad and still all work. Perhaps they run too hot? Was this used as some sort of static display or just someone's television? --- End quote --- It was in an old folks home. These questions have no answers I can give. Yes it’s widely known - you and I know that. IanB seems to think it’s “undiagnosed” when I can see the leds through the grilles in the rear of the set, glowing this purplish blue… I’m not wanting to be awkward or rude, IanB, but it’s very much diagnosed. I’m moving on from that point, not backwards to an imagined other misdiagnosis. |
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