[garibaldi70]

As an update- I had a quote to repair of A$1200 each amp plus shipping so it’s probably beyond a price where it’s worth it so I’m attempting to really find the faulty components .
had a look with a thermal camera but nothing overly hot – maybe because the bass aren’t working so that part of the circuit associated with them aren’t showing their faults . Wondering if there’s an inbuilt protection mode that shuts down just the bass etc ???

there’s so many capacitors in the amp – electrolytic , ceramic and blue poly ones . Wondering if I should start by ordering and replacing the electrolytic ones and see if that does anything but to be honest – they don’t show any signs of age as I was hoping I’d simply see .
It’s really hard as there just isn’t much info out there and haven’t found any B and O elec diagrams or heard from anybody that can say where most probable place is to look .

At the moment these speakers are just a rather chunky pair of coat hangers !

[garibaldi70]

I took a photo of these a couple of weeks ago when mine flew off too. I put it back on a took a photo of which way around it was but exact location may be slightly further to the end

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[garibaldi70]

Thanks for advice guys.

dismantled the pcb’s and with help of a new set of headband magnifiers, inspected the board closely and cleaned with isopropyl alcohol. The only slightly abnormal capacitor I could see was a tiny SMD 3mm x 1.5mm one with some blackening on the top so not sure this could cause such a catastrophic failure but you never know as could mean the chip next to it is faulty .All other capacitors seemed to look fine and ones I could access I performed some simple continuity tests with a multimeter. Haven’t been to trouble of taking any off for full test . Was hoping it would have been simple capacitor problem and easy to see but that’s next step.

ive ordered a cheap thermal camera to see if any chips show signs of shorting/ excessive heat  and that’s probably as far as i can take it myself as it’s been 30 years since my physics degree when I last really played with electronics !

trying to repair these as cheaply as possible – running on fumes here due to a long ongoing legal dispute with major tech companies over patent infringement but that’s another story altogether !

I did see a pair of Beolab 1’s with a Beolab 2 for sale for A$500 and advert was only 5 hours old but as Aus is a large country it would have cost me $1k to ship it by time appropriate packaging had been made. By time I figured could be cheap to just use the boards they were gone . Damn

Will see if can find fault myself in meantime- sent a few emails out but nobody really responding. Spoke to B and O a few years back who gave me a guys number but he wasn’t really interested in a pcb fix- just said best to replace whole amp board .

wont give up yet !

 

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[garibaldi70]

Just adding a few photos of pcb’s prior to cleaning .

any experienced guys think this qualifies as potential causes of faults or more likely components damaged ?

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