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10-18-2019, 03:16 PM
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#1 |
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Badcaps Veteran
Join Date: Nov 2015
City & State: BC
My Country: Canada
I'm a: Knowledge Seeker
Posts: 810
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LG 49UJ6500 Blue Blacklights
Check this out. LEDs have turned blue. TV is only 2 years old. Owner doesn't know history since they bought it used so could have been store demo. Ordered the wrong strips since there is a panel version that uses 3 rows of strips. Only two rows on this one for a 49 inch TV.
Last edited by neilc6; 10-18-2019 at 03:42 PM.. |
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10-19-2019, 05:00 AM
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#2 |
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Senior Member
Join Date: Jun 2015
City & State: Warsaw
My Country: Poland
Line Voltage: 230VAC 50Hz
I'm a: Professional Tech
Posts: 136
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Re: LG 49UJ6500 Blue Blacklights
What the? Is this some bizzare LED aging? I have seen LEDs that turn greenish after overheating but this is extreme. Maybe it has some special diffusion filters that change the light wavelength?
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10-19-2019, 07:52 AM
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#3 |
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Badcaps Veteran
Join Date: Jan 2013
City & State: midwest
My Country: U.S.
I'm a: Knowledge Seeker
Posts: 5,444
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Re: LG 49UJ6500 Blue Blacklights
Probably overdriven, definitely worn out and turned blue. The yellow phosphor wears off and blue is left.
Last edited by nomoresonys; 10-19-2019 at 08:06 AM.. |
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10-20-2019, 10:23 AM
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#4 |
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Member
Join Date: Apr 2012
City & State: west midlands
My Country: uk
I'm a: Knowledge Seeker
Posts: 34
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Re: LG 49UJ6500 Blue Blacklights
Lg or other vestel brand leds have a problem where some or all leds turn blue and it’s just bad leds they use, I had the same problem in hitatchi and LG tv where some are blue but the picture was fine and I only noticed as I was stripping tv for parts but I can’t sell the backlights as they are faulty , pictures attached
Last edited by imran333; 10-20-2019 at 11:01 AM.. |
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10-20-2019, 12:38 PM
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#5 |
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Senior Member
Join Date: Sep 2018
City & State: Katy, Texas
My Country: United States
Line Voltage: Low
I'm a: Knowledge Seeker
Posts: 161
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Re: LG 49UJ6500 Blue Blacklights
Over voltage causes LEDs to change colors and is permanent.
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11-12-2019, 04:31 PM
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#6 |
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Badcaps Veteran
Join Date: Nov 2015
City & State: BC
My Country: Canada
I'm a: Knowledge Seeker
Posts: 810
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Re: LG 49UJ6500 Blue Blacklights
Got a second LG in with blue backlights 43UJ6300. Popped off the lens this time and it appears there is a yellow filter (see this yellow in all previous LED backlights) that has crumbled away exposing the naturally blue LED underneath.
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11-12-2019, 05:40 PM
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#7 | |
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Badcaps Veteran
Join Date: Jan 2013
City & State: midwest
My Country: U.S.
I'm a: Knowledge Seeker
Posts: 5,444
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Re: LG 49UJ6500 Blue Blacklights
Quote:
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11-12-2019, 05:58 PM
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#8 |
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Badcaps Veteran
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,474
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Re: LG 49UJ6500 Blue Blacklights
They are driven so hard so they fail and LG knows it.
LED failure mode: https://www.dfrsolutions.com/hubfs/R...Mechanisms.pdf
__________________
Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 |
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