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multi-layered circuit boards

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Top 75 Contributor
Durban, South Africa
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BenSA posted on Wed, Jan 23 2019 8:56 AM

I was chatting to an electronic engineer friend of mine and he mentioned that electronic companies are using more and more multilayered boards and components that are too small to identify without a circuit diagram. Layered are very difficult to repair. 

Not being an electronic guru, clearly most of the B&O products that are being produced now aren't repairable? Once B&O ceases to make the boards the units are worthless, throw them in bin. 

Will that be the end of collecting and future vintage B&O? 

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Top 25 Contributor
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Evan replied on Wed, Jan 23 2019 10:58 AM

I'm not sure it is the end, but multi-layerd boards do complicate things. 

Components aren't going in between layers yet, still only traces. Usually the inner layers are ground or power planes for the various circuits. For example, separate, dedicated ground planes for digital circuits and audio circuits respectively.

Components, while tiny, still need to go on the top or bottom layers.

Beo4 'til I die!

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Utrecht, The Netherlands
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Beobuddy replied on Wed, Jan 23 2019 11:26 AM

It indeed becomes harder to get boards fixed without diagrams. It would make life/repair much easier..

Sometimes you need 2 boards (1 defective and 1 functioning) to measure differences to get the culpritt.

On the other hand, (smd)components nowadays are much smaller than years ago and more difficult to replace.

Multilayering is already used for at least more than 20 years at B&O boards Broken traces between vias are one of the more difficult culprits to find

Until now I get 80-90% back in working order again (BL1, 3, etc.). I've hoped for the past many years they might release some more diagrams of obsolete parts. boards and devices.

I get a lot of owners of vintage B&O that left the B&O dealer disappointed as they were told that their beloved BS9000, BL1 or other couldn't be fixed any more. The challenge then is to make them still enthousiastic about the newer products (they often never have seen before, M5, Essence remote, Moment, etc) they see here. I've had several occasions where the owners did buy new products to combine them again with their speakers they bought years ago for a lot of money and aren't eager to spend that amount of money again, with the thought of degraded support nowadays..

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Durban, South Africa
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BenSA replied on Wed, Jan 23 2019 12:15 PM

I am glad there is still hope but clearly its only people who are really well versed in electronics that can do such repairs. I would imagine the time it takes to effect a repair must be quite long. 

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marexy replied on Wed, Jan 23 2019 12:15 PM
Great respect for you Beobady... and  like.. to enable us to re-use top-level units that were top-notch.
As you say newer units in the in most cases can't be fix.
Spare parts are abnormally expensive.
New chassis for beolab 3 is with the price of 1000 € ... used BL3 are  600 € pair complete speakers!
I have 5x BL4 that i am looking for power amp. board..and hope i find it soon.
If any of you have spare it i would love to buy it.


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