BV Avant 75 bleeding

Dear friends of beoworld

At the moment I am suffering from a new frustration with my Avant 75; bought in 2015 the first problem was solved within guarantee - I was very happy;

My current problem: backlight - as you can see on the pictures there is a major bleeding at the bottom of the picture and one can the different sections of the backlight panel.

I got in contact with my official dealer and he wrote to Denmark where B&O said this problem is "within range"; so I am very frustrated - whats your opinion?

thanks and best regards

Elmar 

 

original answer from B&O

***** Question *****

Symptom:
On 25% gray test picture it is possible to see the uniformity of the backlight (visible as vertical blocks)

Root cause:
The transparency of the different filters/diffusers/LED in the LCD display varies a bit across the screen. See the official explanation/letter under answer


***** Answer *****

Workaround:
None this is a normal behaviour on LCD displays

Resolution:
This is an official explanation/letter that can be used for the client. You must translate the text to the local language before sending it and adapt the answer for the client if necessary.

"
Dear customer,

We have received and understood your remarks about uniformity of the BeoVision Avant 75/85 LCD screen, observed in certain (moving) scenes.
We would like to explain some of our technology choices made for this TV model.
The LCD module used in BeoVision Avant 75/85 is of the direct-LED backlight type with an array of many LEDs positioned behind the LCD screen. These LEDs can be controlled in small groups, making it possible to reduce backlight intensity locally, depending on scene content.
This technique is called local dimming and it improves the local picture contrast drastically, while reducing the energy consumption of the TV significantly for the majority of TV material.
A minor drawback of this technique is that it can be more difficult to achieve a fully even uniformity in bright scenes, an effect pointed out by you.
LCD modules with edge-LED backlight type (such as in the BeoVision Avant 55) do not have this minor drawback, but they do not benefit in the same way from the better dynamic contrast and the reduced energy consumption.
We would like to point out that the advantages and disadvantages of edge-LED and direct-LED type backlight systems are well known among the different TV set makers in the industry.
You will see that different TV set makers have made different technology choices.
Bang & Olufsen have decided to opt for the direct-LED backlight type with local dimming for our largest screen size (75/85") flagship product, because this in our opinion gives the best trade-off between advantages and disadvantages for our customers.

We hope that this has helped to explain the observations you have made.

 

 

pictures

second pic

 

That looms really bad. Also the tradeoff they are talkong about is in my voew the wrong way around. Edge backlight is prone to bleeding but direct-led should not have that mich bleeding. The picture you have looks like a faulty display. Did Beocare even look at the picture?

Sorry for the typo’s but i’m unable to edit from my phone.

f5434964:

second pic

Looks to me like there is a fault in the Avant's construction, leading to pressure on the panel that causes the backlight bleed.

Notice how the bleed is located at the bottom of the screen exactly where the motorized speaker mechanism is housed.

I'd say a faulty construction of the TV is to blame for the light bleed. Maybe they put a few screws too tight!

Such prominent light bleed is unacceptable for any top-of-the-line TV, let alone the very expensive Avant 75".

very poor answer from B&O.

Fix the issue, avoid bad publicity, happy client!

we bought a cheap Samsung Fridge, 2 years out of warranty and an electrical component died, they fixed it at no charge, within 2 days. i cant complain about that!

This seems like an obviosly faulty product for what ever reason. If the screen is too tight, they should fix it. If the screen is faulty, they should fix it. I doubt if this is “in range” that anybody would’ve bought this tv in the first place. Iam sorry, i feel bad for you for the product and care given.

Agree with Mikipedia - I would get the dealer to have a look at it, as I believe there were some TV's with cables mounted wrong (pinched) etc. On a grey test screen or a typical "YouTube start-up image" you may see vertical lines with this LCD tech, but on the sets I have seen it is impossible to notice when watching tv (ie moving pictures).

Roger

This is a known fault, and you have received the standard answer - which is rubbish (in my opinion).

My own Avant 75 had the exact same issue, and I too had the same response. A few photos of the clouding on a grey background, and also green, of it looking truly awful (and unwatchable, frankly) then B&O eventually admitted it wasn't right and replaced the panel.

The new panel has a few areas of very light clouding, which I can accept as 'within tolerance'.

I'd push for a new panel. What you have isn't right, and shouldn't be accepted on such an expensive TV.

Lee

Thanks a lot for all your thought and hints!

I have written to Beocare on my own - if the answer is kind of interesting I will let you know!

Best Regards Elmar 

Thanks to B&O I have got a new TV -> BV Avant 75 NG (new TV - new problems )

Elmar 

I’ve got the Avant 75 NG and have been very happy so far. I think the problems at first release have been resolved. Hope you have the same experience I have - so far, so good.