Author Topic: Lg 43uh620v blue leds  (Read 318 times)

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sinclairtv

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Lg 43uh620v blue leds
« on: November 04, 2018,06:53:40 »
Got in one of these sets with picture that looked like a lack of green. Customer bought another so I took it to bits to check leds. Strip no is uf64_uhd_a. I prised lid off of one to see and it's tiny and bright blue. Photos enclosed but not great.

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Lg 43uh620v blue leds
« on: November 04, 2018,06:53:40 »

downunder

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Re: Lg 43uh620v blue leds
« Reply #1 on: November 05, 2018,04:33:00 »

There are mentions of this on-line for this model, no detailed cure other than hinting it'd be cheaper to buy a new tv.

Bruce

sinclairtv

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Re: Lg 43uh620v blue leds
« Reply #2 on: November 09, 2018,06:31:56 »
Update. Replaced every led. Solved the problem though I can now see leds shining through as I hard wired them on top of existing strings. Must have been manufacturing fault though goodness knows how every led went blue.

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Re: Lg 43uh620v blue leds
« Reply #2 on: November 09, 2018,06:31:56 »

Turnip

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Re: Lg 43uh620v blue leds
« Reply #3 on: November 12, 2018,12:16:37 »
Hi Sinclair,

Replacing every Led is pretty nifty, especially when hard wired to existing strips - Guess you do it as you can.

Suspect new Led lenses nearer the screen than originals. Might be an issue as even original ones give trouble if not replaced exactly as they were.

Note that using clear adhesive causes lenses to give issues as modifies light dispersion giving bright screen patches.

Trying sort a non-clear adhesive, guess White, as anything else gives trouble - Chris.

downunder

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Re: Lg 43uh620v blue leds
« Reply #4 on: November 14, 2018,03:10:16 »

Well, kudos to you, Sinclair. That's how I replace dud LEDs. Clean off the dud and then snip off a piece of strip with a good LED on it. Solder this in place with short wires so it can be located in the hole of the white reflector sheet. Getting quite good at it now. No tiny LEDs slipping away never to be found again and no lens cap to align.

Can't say that I've had a problem with light spots even though the new LEDs are fractionally closer to the screen. The LGs with the chunky lenses are worst for this and 90% of them drop off if you lightly touch them.

Bruce

sinclairtv

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Re: Lg 43uh620v blue leds
« Reply #5 on: November 16, 2018,14:58:27 »
These blue LEDs were tiny so no chance to replace them. I usually break them with cutters, then melt some solder on them till they can be scraped off, then keeping the lens in alignment, replace the LEDs. I only hardwired these as an experiment when I had 3 hrs to spare lol

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Re: Lg 43uh620v blue leds
« Reply #5 on: November 16, 2018,14:58:27 »

Turnip

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Re: Lg 43uh620v blue leds
« Reply #6 on: December 01, 2018,09:56:10 »
Hi Folks,

Just got a Sammy UE32J5100AK where the Leds are Blue RHS but nearly normal LHS with a gradual colour shift between.
Guess at some point replace Leds individually, but in the mean time, strips from an Ebay screen smash.

Wonder why a Led changes colour ? - Chris.

Later - Took the screen off finding 8 S/C Leds and the Blue ones had shed the usual Yellow coating as perhaps got a little hot.
« Last Edit: December 03, 2018,09:35:35 by Turnip »

 

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