ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
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.
Foamrot.
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...
Agreed, foamrot doesn't behave as this does.
Guess it is a trip to the B&O service center.......
Thanks.
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 eatsaway at copper traces on the circuit boards.Usually repairable.Martin
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.
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.
larseny: 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.
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.
Beobuddy: ... I even get the customers who are re-directed (or with highly given posprositions) by B&O service centers..
... I even get the customers who are re-directed (or with highly given posprositions) by B&O service centers..
I don't know if they changed the foam during production, I don't think so, but I can tell you, thatthere's a mess inside your speakers now. Particularly in the lower areas where the amplifier, power supply, relais etc. lives andwhere cables come in.It's all a black and sticky mess. I use disposable rubber gloves...
Martin
Sounds like a good old "oops" from B&O's design department............would have thought they had fixed it by now, but mine are older speakers so I am expecting the worst (but hoping the best) and as I said earlier, assume once one is fixed the second will go shortly thereafter.
Hi, I have got a pair of Beolab 8000, One is dead, the LED does not come on. After opening it I found the foam as you described, sticky and very dirty. I have cleaned it and started to check what could be wrong. Anyway my question is can the foam be purchased anywhere? for replacement? and do I need it?
Thanks
OK, speaker fixed by local tech, solder points corroded and IC board shorted out (obviously due to age and possible foam rot deposited on board). Not cheap, but not too bad. About $150 and it is back in business.
Thanks for your reply. I cleaned all the mess and found out that everything is in good shape. The wires, Circuit Board, Components all look nice.But still no LED goes on. Have found the Service manual and trying to figure out where to messure. I am not sure how its trigged on. But the LED shoud be red when the speaker is off I think. Have also checked the fuses and all are good. Maybe i should leave it to the B&O service shop...:-)
There is a small Standby transformer. It supplies the standby current for the Relais and the LED.
Whatever done, the red LED must work. If not, the transformer or the fuse or the rectifier etc is dead.
Thanks for reply. I checked the small transformer, there is 240V inn but nothing out. So this thing is dead. Any suggestion where to get hold of a New one?
The standby transformer has the part number 8013473
I dont know the exact Rating, the standby Transformator has around 2x 18V or 2 x 24V
Maybe 100mA
Hi DillenThanks for your explanation, I suspected a problem related to the control standby of my BL8000, with your post I have directly repaired them. -> command relay, thermistor feed, and some future cracks on a feeder.Now, I have to change the foam... what kind of replacement can I use ?
Beobuddy:Sorry for the short answer.
For Dillen & Beobuddy, Is it possible to buy genuine parts ?RegardsBruno
Many Vintages
For me , it is.
Should I translate you by "not for me in Paris" ? If it's possible, buy genuine parts is the simpliest way but it's not really relevant for the foam, is it possible to replace it by an equivalent (which is ?) I will be happy to have a good solution RegardsBruno
Does anyone have pictures or instructions on how to clean or fix? Pictures?
The other question is if this happened to one of your speaker, are you pro active and just do the other speaker also or wait for that to go bad first?
I guess if there is foam rot short circuiting the IC board and solder post deterioration, it is a matter of whether you want to drag one speaker at a time for repair, or get them both done and over with. I chose the latter, better to be safe than sorry and sitting and listening to your just fixed speaker and then have the other go out. I have an even bigger problem which is maybe why do it now is better than later. I have two pairs of Beolab 5000 active flat panel speakers (the oldie but goodies and beautiful wall art). One has no problems soundwise but displays are dodgy. The others I believe the relays or circuit boards have gone, because they show the light and go click when plugged in, but do not turn on the amps when input is turned on, whether using BEO cables or RCA cables. So, in effect I have a pair of beautiful speakers that will not play (unless I use an outside amp and connect to the bypass inputs for this) and when I took them to the repair shop, first of all the guys could find no documents or schematics for them, so I downloaded them off the net and gave them to them. Secondly and more importantly, and I got this answer from a lady in DK too who is the B&O service manager, "we do not stock parts for speakers older than 13 years", so fu.. me, I am stuck. Anyone have parts - IC boards and/or switching relays for a pair of Beolab 5000's?
You're welcome to send the amps over.
I've overhauled several sets, even some already defective.
I would recommend to send both amplifiers.
I had the same problem a few weeks ago,'
When red and green LED work and no sound, the relais that powers the amp is not working, on 2 occasions the print traces on the bottom of the supply print where corroded of the print due to foamrot, soldered 2 wires to the relais instead of the traces and all was well!
(and replaced the foam!!!!)
marc:(and replaced the foam!!!!)
Hi Marc,What kind of foam do you use for this remplacement ?genuine parts or equivalent with some cut ?Regardsnono
just bog standard acoustic foam.
There are many standard ;-)I presume you take same kind of grey foam acoustic ?or is there an acoustic equivalent without risk of degradation ?
Regards
nono
well, the simple gray stuff works fine for me, i do not expect it to liquefy within 20 years, so....
I would love to, but unfortunately I am currently working in Abu Dhabi in the United Arab Emirates so that would be cost prohibitive to send them.
The local Dubai B&O guys just ran away scared, but one of them suggested it was not the amps, it is either something simple as a fuse or the relay.
Good tip from Marc, had the same problem; orange light for a while, so cleaned out the foam. Light went back to red, but no sound, so checked the relay and one track was looking ropey - quick check with a meter confirmed that the track running around the edge of the board was corroded as I was getting no connection between the relay and the connector.
Quick solder of a wire and job done!
frog:Light went back to red, but no sound, so checked the relay and one track was looking ropey - quick check with a meter confirmed that the track running around the edge of the board was corroded as I was getting no connection between the relay and the connector.
Mine had exactly the same problem. The track didn't look corroded though, but the coating of the PCB appeared to have a small scratch near the corner. Perhaps the protective laqcuer had a small imperfection from new, and that was the spot first attacked by the decaying foam.
You should hear the relay click when you plug the speaker into mains.
--mika
Hi I'm awaiting my BL8000s and one of the speakers has had this repair done already however I want to be pro active for the 2nd one and do it myself - what did you use to actually clean out the sticky mess and where can I find out to open the casing?
Thank you in advance!!
:)
new to the game - awaiting my first BL 8000s MK1
the foam in the speakers can be vacuumed out with a hoover.
the sticky mess wil disolve in methyl alcohol, dirty job but someone's got to do it!☺☺☺
My beolab 8000 is purchased in Japan and shipped to Vietnam. It uses 100vol electricity but I plugged wrongly into 220vol. now it is no sound even though the signal light is still turning green when playing music. How to fix it? please help me
tôiI want to buy
Man oh man, I am in this total fiasco. I have a pair of 8000s that have had a B&O service center voltage conversion - 220 to 110. They were shipped to me and wouldn't play a sound. Both lights were orange. Then I shipped them to a service center who "swore they were working". Then they're mailed back to me and they're both totally dead. Nothing. No red light at all on either. Nothing. Totally dead. The supplier who sent them originally said they worked. Then they get to me and they dont work. Then the repair man said they worked and they again dont work. Not even the red light! What's going on?!? All parties involved have been very professional, but I am getting frustrated. Any suggestions?