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Lab Gruppen E Series 12.2 |
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Earplug 
Old Croc 
Joined: 03 January 2012 Location: Europe Status: Offline Points: 6765 |
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 Topic: Lab Gruppen E Series 12.2Posted: 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. |
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Earplugs Are For Wimps!
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4670 |
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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.
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Kevin
North Staffordshire |
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 6765 |
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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.  |
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Earplugs Are For Wimps!
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 6765 |
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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! |
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Earplugs Are For Wimps!
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kedwardsleisure
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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
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Kevin
North Staffordshire |
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 6765 |
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Posted: 25 May 2022 at 1:08pm |
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Ok. I'll post some photos later - hopefully without any flames!!  |
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Earplugs Are For Wimps!
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kedwardsleisure
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Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4670 |
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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.
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Kevin
North Staffordshire |
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 6765 |
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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:-    |
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kedwardsleisure wrote: