Lab Gruppen E Series 12.2
Printed From: Speakerplans.com
Category: General
Forum Name: Amp Forum
Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=107107
Printed Date: 27 March 2026 at 7:52am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Lab Gruppen E Series 12.2
Posted By: Earplug
Subject: Lab Gruppen E Series 12.2
Date Posted: 23 May 2022 at 8:31am
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Anyone know what these have on the o/p? No markings and I can´t find a service manual. Ta. ------------- Earplugs Are For Wimps! |
Replies:
Posted By: kedwardsleisure
Date Posted: 23 May 2022 at 12:38pm
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phoenix in and out, the outputs are the heavy duty ones with flat blades. ------------- Kevin North Staffordshire |
Posted By: Earplug
Date Posted: 23 May 2022 at 1:15pm
I meant the O/P devices!  Obviously MOSFETS. I'm guessing IRFB4020, or maybe IRFP4227, but it would be good to know for sure.  ------------- Earplugs Are For Wimps! |
kedwardsleisure wrote:Posted By: Earplug
Date Posted: 25 May 2022 at 11:30am
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So no LG technicians on here, then! I'm getting the amp later, so it'll be a bit of plug-in-and-play! ------------- Earplugs Are For Wimps! |
Posted By: kedwardsleisure
Date Posted: 25 May 2022 at 12:56pm
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I've never even seen one let alone fixed one. In the UK that end of the market is occupied by Cloud ------------- Kevin North Staffordshire |
Posted By: Earplug
Date Posted: 25 May 2022 at 1:08pm
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Ok. I'll post some photos later - hopefully without any flames!!  ------------- Earplugs Are For Wimps! |
Posted By: kedwardsleisure
Date Posted: 25 May 2022 at 10:30pm
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FWIW I've only ever seen 2 labs that have gone bang. One had been put on 415V and the other had, at best guess, a bottle of WKD poured into it while it was turned on. Both were repairable. ------------- Kevin North Staffordshire |
Posted By: Earplug
Date Posted: 26 May 2022 at 8:29am
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Yes - Labs are usually quite reliable. Not sure what happened to this one. The O/P MOSFETS are IRFB5615's, but unsurprisingly, the problem goes deeper. I replaced the damaged devices and the thing powers up, but still no output and the damaged channel clips early on the front LEDs. There's a lot of smd's on the underside of the board, so undoubtably the problem is somewhere in there. I'm not sure what I'll do now, as I usually pass on smd-heavy stuff, especially without any schematics. Anyway, some photos:-    ------------- Earplugs Are For Wimps! |
Posted By: AudioSystemsEngineer
Date Posted: 28 March 2025 at 1:28am
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Just to shed a bit of light on these (for anyone who lands here)... The amp board here is the same as what's in an IPD2400 i've got in front of me. The 2400 has 2 of these in bridge mode. Its the same single chip IRS209x amp as many powered speakers, So the board has a standby switching PSU, a Main switching PSU and 2 x class-D chip driving the fets. Now the bad news... although some of the LABs are designed by TC Electronic and are servicable, this one is a behringer 'disposable' amp. Instead of using an off-the-shelf class-D driver such as the IRS2092 or IRS20957S, they've gone for a 'special' IRS20956S which is unavailable. So if the amp goes, its a whole module replacement £300 - from behringer ! kerching !
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