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Why do backlight LEDs burn out and go blue?
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eti:
Why do backlight LEDs burn out and go blue?

12-11-21: (update) - attached, images of the faulty LEDs being tested. They have around 2.5v drop across them.

I've been given an LG 4K TV, and the backlight LEDs have been left on full whack, and have gone blue... but why does this happen - phosphor diminishing?

(14-11-21) Jump to this post to see macros of the bare LED die and lens type assy: https://www.eevblog.com/forum/chat/why-do-backlight-leds-burn-out-and-go-blue/msg3812753/#msg3812753

Edit (added info): just found this article >> https://jestineyong.com/quick-understanding-of-led-bulb-turning-blue/

https://www.circuitsonline.net/forum/view/148440

For anyone doubting that this is the case, see below:


bdunham7:
They don't.  Your TV is in blue mode.
eti:

--- Quote from: bdunham7 on November 05, 2021, 10:16:58 pm ---They don't.  Your TV is in blue mode.

--- End quote ---

 :-DD
amyk:
That doesn't look like the backlight, but rather (two!) missing channels of video data.
IanB:

--- Quote from: eti on November 05, 2021, 09:44:34 pm ---Why do backlight LEDs burn out and go blue?

--- End quote ---

They don't. You have a TV with an undiagnosed fault where the symptom is a blue screen.
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