Spot the deliberate mistake |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Rather costly 'mistake' if anyone fancies a go. A picture of half an easter egg with teethmarks in it for the first to guess correctly.
Client bought a pair of powered studio monitors off ebay, sold in good order. I might have the details a little in the wrong order or missed out the finer points... but essentially he tried them on an ipad. They worked fine. He then tried them on his iMac desktop studio setup through a USB audio interface. The iMac went up in smoke. Went off for repair, was told the motherboard was 'fried'. Expensive repair. Sent the interface to the manufacturer who gave it a clear bill of health. Here are the mucky pics of one of the monitors. |
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Kevin
North Staffordshire |
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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Easy!!
It looks like the Chips doing power amp duty, bolted to the heatsink, have been "molested", from the way the paste is messy. I would guess their tab carries a voltage, which has not been correctly isolated from heatsink. Heatsink is bolted to PCB, via bolt with red sealing varnish on it, conveying this Tab Voltage to "earth"/0V. 0V on an iPad "floats" or has a DC blocking cap on I/P. MacBook doesn't have DC blocking cap on USB input? Poof!
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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This question is for everyone apart from Matt
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Kevin
North Staffordshire |
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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The giveaway was the paste, looked sloppy. Then you look and can see different "shades" of grey of solder, and you know someone has been in before you.
When you realise that, you are suddenly filled with the dread of having to fix the original fault, and the fault caused by previous "Engineer"... Typical that my first reading of a post on the forum in 4 months was this one!! Sorry, next time I will shut up, and let someone else have a go first. Just feel so out of practice, what with Furlough and stuff.
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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-24V DC coming out of the XLR socket. What gets me is that someone knew enough to change the amp IC but not enough to know the funny little thing that fell on the floor was an insulating washer Edited by kedwardsleisure - 07 April 2021 at 2:25pm |
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Kevin
North Staffordshire |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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caption competition....
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Kevin
North Staffordshire |
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jazomir
Old Croc Joined: 20 November 2006 Location: Sunderland UK Status: Offline Points: 1710 |
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Electrical widow maker.
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For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants.
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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"Sure mate we can have a link up, here's a power lead for your Soundlab rack"
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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njw
Old Croc Joined: 26 March 2010 Location: S. Wales Status: Offline Points: 2572 |
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'Put yer tongue on this....'
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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"NO"--You are not shoving that up my fanny!!!!!!
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Aaah - I see ... you play death metal !
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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That cable has it's uses. Say the power in your house goes down. Plug the Cetac end into a generator, the other into a 13A socket - and voilĂ - your house has power again! |
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Earplugs Are For Wimps!
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