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Amp Internals 2 |
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Earplug 
Old Croc 
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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 Posted: 08 June 2023 at 5:26pm |
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Gordian Knot. Get out the angle grinder!  |
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Earplugs Are For Wimps!
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ceharden
The 10,000 Points Club 
Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Posted: 09 June 2023 at 12:01am |
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Once I got in by removing one of the latches, I was greeted by another wonderful piece of design. The remains of the (under-rated) integrated SMPS controller/MOSFET soldered to what can loosely be described as a heatsink (bit of bent tinned copper sheet). The top of the IC had in fact fallen out of the chassis at the customers house but by some miracle they managed to find it, photograph it and I've been able to determine the part number. I had to remove the two electrolytic capacitors in front to get access and it was a good thing that I did because one of the capacitor legs was broken and had either been arcing or had melted when the IC blew. I'm not giving the repair a high chance of long term success but I have managed to remove the old IC and order a new one. Given the price of a new board it's worth a go! 
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 10 June 2023 at 9:22am |
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Got a couple of these in for repair a few days ago:-  I'm not sure how long they'd been in storage, but given the dust (& cobwebs  ), quite a while. Anyway, the guy would like to get them up & running. Just cracked open the first one and found this "improvement":-  Oh man.... Funnily enough, the rest of the board looked (& tested) ok.  In the end, the problem was the 12" driver - totally cooked. Got the thing running ok now. Will tackle the other asap. |
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Earplugs Are For Wimps!
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EmPro
Young Croc 
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 10 June 2023 at 10:38am |
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,,I'm not giving the repair a high chance of long term success but I have managed to remove the old IC and order a new one. Given the price of a new board it's worth a go!''
The main reason i hate SMPS....good only for low power aplications,smps should be banned from AF aplications
 and insteed of makeing 20kw power amplifiers...maybe they should focus to make god damn efficient speakers that don't require 10kw of power for 130db of sound pressure....Edited by EmPro - 10 June 2023 at 10:44am |
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EmPro Audio
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 10 June 2023 at 10:43am |
Never liked any of the BOSE's craps...except the ones BGW made for them the 1800 series,those are proper power amps,basically BGW under the hood
Edited by EmPro - 10 June 2023 at 10:49am |
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EmPro Audio
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 10 June 2023 at 11:39am |
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Yes - Bose is/was more about BS than reality - but some people love them. I do believe that their noise-canceling headphones are quite good. What I call ironic!! |
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Earplugs Are For Wimps!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 10 June 2023 at 11:45am |
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indeed they do good headphones
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EmPro Audio
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jbl_man
Moderator Group 
Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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Posted: 10 June 2023 at 1:33pm |
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We have a winner! Well done Earplug, congratulations on posting the worst, and ugliest speaker ever made. What on earth were Bose thinking when they made these things? They look like the back-end of a 1980's Cathode ray tube TV.
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Be seeing you.
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Earplug
Old Croc
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 10 June 2023 at 1:45pm |
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Thank You! It's called Innovation! |
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Earplugs Are For Wimps!
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EmPro
Young Croc
Joined: 26 June 2020 Status: Offline Points: 766 |
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Posted: 10 June 2023 at 1:51pm |
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looks more like a 1930's valve radio
 Edited by EmPro - 10 June 2023 at 4:51pm |
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EmPro Audio
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madboffin
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Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1539 |
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Posted: 11 June 2023 at 8:41pm |
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That radio looks (and probably sounds) much better than the Bose...
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EmPro
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Posted: 11 June 2023 at 8:42pm |
That's for sure
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EmPro Audio
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Earplug wrote: