Beolab 8000 no sound

39 replies
L(
Offline
larseny (archived2)
Bronze
Posted July 10, 2015 at 11:28 GMT
#2202597

Hi.

I have a pair of Beolab 8000 speakers connected through a Beolab 2 to my Beosound 5 Encore.

One of the speakers suddenly started dropping out, and when doing so the LEd light turned orange. After a few power off and on and disconnecting power, it went back to working, only to next time do the same.

Now however, it only displays red light in standby and green light when turned on, however NO SOUND!

I thought when green light is on, all is OK, but obviously green light can be on and no sound comes out. I have switched back and forth on cables etc, so I know both outputs on the Beolab 2 are OK, so it is definitely the 8000 that's got a problem.

Any syggestions anyone? Fuses or something else.

This part of the world (UAE) is not the best to get these speakers fixed but if push comes to shove I will pack in my car and drive to Dubai to the dealer.

Beobuddy
Offline
Beobuddy
BronzeFounder
Posted July 10, 2015 at 12:15 GMT
#2202598

Foamrot.

Location: Utrecht

Quite a challenge to achieve "Less is More" while having the Beovirus.
S(
Offline
SHEFFIELD (archived2)
Bronze
Posted July 10, 2015 at 18:49 GMT
#2202599

I don't think it will be foam rot. More likely to be power supply or amp module. Will need to go to a service centre though...

L(
Offline
larseny (archived2)
Bronze
Posted July 11, 2015 at 03:41 GMT
#2202600

Agreed, foamrot doesn't behave as this does.

Guess it is a trip to the B&O service center.......

Thanks.

DI
Offline
Dillen
BronzeModeratorFounder
Posted July 11, 2015 at 08:01 GMT
#2202601

I agree on the foamrot.
The foam in question is not the speaker surrounds, though.
In Beolab 8000 foam is used around cables and circuit boards for anti-rattling and sealing purposes.
Unfortunately, airs moisture attacks and breaks down the foam, which turns acidic and eats
away at copper traces on the circuit boards.

Usually repairable.

Martin

L(
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larseny (archived2)
Bronze
Posted July 12, 2015 at 07:58 GMT
#2202602

Thanks all. I ended up getting hold of a B&O service tech, so took it to him last evening and will see what he can do.

I thought however when circuits, transformer or power supply goes, the status light would not go from Red to Green. When however it does this, I cannot actually hear the relay turning the speaker on.

Guess I'll get one fixed and the other will go shortly thereafter. 😁

Let's see.

DA
Offline
Davefarr
Bronze
Posted July 12, 2015 at 10:21 GMT
#2202603
If you can report back to us what the tech says the problem is - it may help others with a similar problem in the future.

Dave.
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larseny (archived2)
Bronze
Posted July 12, 2015 at 10:30 GMT
#2202604

Will do, let's see if he is any good. In this part of the world I don't have the highest expectations as the quality of tech's in general is somewhat dubious, and then again sometimes surprisingly good, it's a toss of the coin.

I'll hopefully get a call in the next few days with the diagnose, and will post the diagnostics.

Beobuddy
Offline
Beobuddy
BronzeFounder
Posted July 12, 2015 at 13:15 GMT
#2202605

larseny wrote:

Agreed, foamrot doesn't behave as this does.

Guess it is a trip to the B&O service center.......

Thanks.

Sorry for the short answer.

Dillen explained it more clearly.

But as I've already had 30+ sets for repair, I recognize the symptoms. I even get the customers who are re-directed (or with highly given posprositions) by B&O service centers..

Depending on the amount of damage caused by the foam, repair is mostly the solution. Replacing the complete amplifier or powersupply section, will result in a pricely invoice.

 

Location: Utrecht

Quite a challenge to achieve "Less is More" while having the Beovirus.
AR
Offline
argentas
Bronze
Posted July 12, 2015 at 13:37 GMT
#2202606

I'm curious, did B&O change the foam they used at some stage to prevent this issue or is it simply a matter of time before any BL8000 is affected? I dismantled one of my BL8000s last year and the foam seals all looked to be in good condition but perhaps that was just because they are not as old as some.

If this issue is innevitable with time, I'm just wondering whether it might be worth me applying a laquer to the PCBs to help protect them from ths issue in the future?

Martin.

Location: Exeter, UK

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