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Lab Gruppen E Series 12.2
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Earplug View Drop Down
Old Croc
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Joined: 03 January 2012
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    Posted: 23 May 2022 at 8:31am
Anyone know what these have on the o/p?

No markings and I can´t find a service manual.

Ta.
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kedwardsleisure View Drop Down
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Points: 5157 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2022 at 12:38pm
phoenix in and out, the outputs are the heavy duty ones with flat blades.
Kevin

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Old Croc
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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2022 at 1:15pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

phoenix in and out, the outputs are the heavy duty ones with flat blades.


I meant the O/P devices!  LOL

Obviously MOSFETS. I'm guessing IRFB4020, or maybe IRFP4227, but it would be good to know for sure.  Big smile
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Old Croc
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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 11:30am
So no LG technicians on here, then!  LOL

I'm getting the amp later, so it'll be a bit of plug-in-and-play! 



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kedwardsleisure View Drop Down
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Points: 5157 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 12:56pm
I've never even seen one let alone fixed one. In the UK that end of the market is occupied by Cloud
Kevin

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Ok. I'll post some photos later - hopefully without any flames!!   LOL LOL Shocked LOL LOL
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kedwardsleisure View Drop Down
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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

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Points: 7752 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2022 at 8:29am
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:-















 
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Points: 145 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AudioSystemsEngineer Quote  Post ReplyReply Direct Link To This Post Posted: 28 March 2025 at 1:28am
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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