Do you miss some details in black parts?

If that is the case, that cannot be solved beause that is limited to the contrast ratio of the used panel.

I think BeoLab means it's too dark... 😕

It's entirely possible there's something wrong with the set. I've seen a BeoVision 7-32 which is intermittently dark, possible yours is suffering from the same issue except it's constant?

Either that, or you haven't yet got used to 'that B&O picture', which is sometimes darker than other sets, but usually more natural...

I also find the picture dark especially when I first turn the set on, seems it needs sometime to adapt to the room.

The sets at the dealers have brightness/contrast and colour at mid settings, which on mine is too dark and too much colour, I set brightness/contrast +3-4 levels and colour down 3-4 and it helps, though looking at the picture from the side it is bright compared to head-on.

The dealer brought another set and picture seemed fine on Narnia dvd (battle scene), then returned to my set and picture was the same - so we live with it and I find I often adjust picture during the evening or dependant on program. We have NTL oops I mean Virgin cable and usually use analog 1-5, as digital channels often need format 3 to see complete text on commercials etc.

As Alex says - perhaps I need to get use to B&O picture. - or is plasma better ? 

Plasma is definitely better, but it's not as 'smart' as LCD, it's MUCH more fragile.

LCD panels take time to warm up, as you say. It's only a few minutes, and the same thing can be seen on all LCDs.

The sad thing is that you pay $10000 for a TV set that has worse pic quality than sets that cost $2000...

I had mine for a week, and sold it as fast as possible. 

After you power on it  takes 15 min. before the back lights is on 90% light, don't know have long it's takes before it's at 100%.

but for the first 15 min it will be very dark in daylight, and if the room light doesn't hit the TV light sensor.

Beolab:

Does anyone have some info how i can increase the lightning on the BV 7-40:s service menu? I have tuned up the brightness and contrast, but i feel its to dark anyways...!

If you think your BV7-40 is dark, you should see my old MK-1 BV7-32! Some DVDs, for example, are so bad that they are almost unviewable (The Da Vinci Code is a good example).

It's definitely the panel. My dealer kindly lent me a MK-III BV7-32 when my TV was in for long-term repair, over Xmas. It was much brighter, better contrast and the screen was less 'gloomy' in appearance. As soon as I received my old MK-1 BV7-32 back from repair, I noticed a huge difference.

Apparently the new BV7-40, launched in the US this month, is significantly better and nearly on a par with the BV9. If that's the case, I'm certainly upgrading my old BV7-32 when the new BV7 is launched here in the UK, later this year.

To answer your question - there's little you can do to change your current TV. It's the LCD panel, sadly. I'm assuming you have one of the first revision BV7-40's?
 

HEHE i purchased my BV 7-40 MK II Last week and it is the latest firmware: TYPE No: 9361 = AP SW 7.5

Does anyone have the pin-code to the real service menu for the BV 7-40?????????????????????????????????????????????????????

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Ha! After 3 hours watching my BV 7-40( MK II) are much brighter in every part in the picture! I noticed it when i looked at a Lost episode (DVD) and the scene where dark and had poor colors and like a bright  filter layed on top of that.  But now when i rewind after 3 hours the picture is much more magnificent and brighter over all ! Not far away from perfect "HDlike" picture with DVD i think..=)

(Note: The TV have just been turned on for about 5 hours total)