Is your LED screen backlight needlessly at 100%?

Just been watching a repair video, guy changing LEDs in an LG set.

https://www.youtube.com/watch?v=Bf5T2wwtydY

His recommendation makes sense, just back it off a titchy bit.

--
Adrian C

Adrian Caspersz wrote:

https://www.youtube.com/watch?v=Bf5T2wwtydY
just back it off a titchy bit.

Mine's on 17/20, I wouldn't count his 25/100 as a titchy bit.

On 24/06/16 11:37, Martin wrote:
On Fri, 24 Jun 2016 11:30:15 +0100, Adrian Caspersz wrote:

Just been watching a repair video, guy changing LEDs in an LG set.

https://www.youtube.com/watch?v=Bf5T2wwtydY

His recommendation makes sense, just back it off a titchy bit.

I have two LED Samsung flat screen displays that are set at 0%.

Brightness setting or Backlight setting?

Any suggestions?
They died within two weeks of each other when they were around 4 years old.


I feel sad, I hope you gave them a proper burial ...

--
Adrian C

On 24/06/2016 11:30, Adrian Caspersz wrote:
Just been watching a repair video, guy changing LEDs in an LG set.

https://www.youtube.com/watch?v=Bf5T2wwtydY

His recommendation makes sense, just back it off a titchy bit.


surely leds last for ages - fluorescent tubes less so.

--
Gareth.
That fly.... Is your magic wand.

the dog from that film you saw wrote:

Adrian Caspersz wrote:

Just been watching a repair video, guy changing LEDs in an LG set.
His recommendation makes sense, just back it off a titchy bit.


surely leds last for ages

They die sooner if driven hard ...

I've just replaced 2 LED strips on a 50" LG less than 2 years old. It seems
that LG set backlight current at maximum by default and it's becoming a
known problem with LG's.

Kenny

"Andy Burns" wrote in message ...

the dog from that film you saw wrote:

Adrian Caspersz wrote:

Just been watching a repair video, guy changing LEDs in an LG set.
His recommendation makes sense, just back it off a titchy bit.


surely leds last for ages

They die sooner if driven hard ...


--- news://freenews.netfront.net/ - complaints: ---

In message , Kenny Cargill
writes
I've just replaced 2 LED strips on a 50" LG less than 2 years old. It
seems that LG set backlight current at maximum by default and it's
becoming a known problem with LG's.

Just as an aside, can anyone briefly explain the concept of 'backlight'?
Why is it necessary, and how does it differ from 'brightness'?
--
Ian

On Sat, 25 Jun 2016 09:19:02 +0100, Ian Jackson
wrote:

I've just replaced 2 LED strips on a 50" LG less than 2 years old. It
seems that LG set backlight current at maximum by default and it's
becoming a known problem with LG's.

Just as an aside, can anyone briefly explain the concept of 'backlight'?
Why is it necessary, and how does it differ from 'brightness'?

Liquid crystal displays don't emit light. They are effectively
transparent filters that can only vary their densities, so that to be
visible they need either a reflective backing or a light behind them.
Those silvery-grey number displays on some electronic devices are
liquid crystals with a reflective backing, and need incident light
from the front to be visible.

TV and computer screens have an evenly distributed diffused light
source (either fluorescent or LED), which without the LCD screen in
front would simply display a white rectangle. The brightness of this
determines the maximum possible brightness of any part of the display
where the LCD is at its minimum density. What adjustments are possible
would depend on what controls are provided and how meaningfully
they're labelled, but I would suggest that what to aim for is to set
the video gain so that peak white corresponds to minimum LCD density
(ideally by checking for the the top levels of a staircase test signal
just beginning to crush), then set the backlight to make that part of
the picture whatever brightness you want. Then you should use only the
video controls to set black levels, because black is determined by the
maximum density of the liquid crystal and backlight won't have any
effect on this without having a much greater effect on the white level
you've just set.

Rod.

I can understand this for the fluorescent kind of back light, but I thought
LED ones were immune.
Brian

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"Adrian Caspersz" wrote in message
...
Just been watching a repair video, guy changing LEDs in an LG set.

https://www.youtube.com/watch?v=Bf5T2wwtydY

His recommendation makes sense, just back it off a titchy bit.

--
Adrian C

"Brian Gaff" Wrote in message:
I can understand this for the fluorescent kind of back light, but I thought
LED ones were immune.
Brian


You would think so wouldn't you?
Perhaps the less well designed sets over-run the LEDs when set
near maximum.
--

%Profound_observation%


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