Question about Altec Lansing VS4121 Speaker

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No Power (LED off) in the Altec Lansing VS4121

I have an Altec Lansing VS4121 Speaker system. Recently, possibly due to some voltage fluctuation, something has gone wrong with the Speakers and they dont power on anymore. LED light remains off. I tried looking into the circuit to see if a fuse was blown and I managed to open up the woofer, and see the internal circuit, trying to trace the flow of electricity. It seems that there is voltage flowing into the right Satellite speaker. But I cannot manage to figure out how to open up/disassemble the Satellite speaker. Does anyone know if there is a fuse built into the Speakers which may have blown. Or anybody ever managed to disassemble the Satellite without damaging it?

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  • sunnys3 Apr 17, 2008

    Thanx for the suggestion.

    But I actually already checked the fuse on the power supply board inside the subwoofer case.

    The circuit inside the Subwoofer case seems fine to me.. I actually checked it out with a multimeter borrowed from a friend :D

    I see voltage flowing into the right satellite speaker... which houses the controls and on/off switch, so I thought there must be some minor circuitry in there as well...and want to check that out.

    But I cannot manage to figure out how to open up the right Satellite speaker without damaging it... cant see any screws :(

    and I dint apply too much pressure..

    The problem is I dont have an authorized Altec Lansing dealer around here... and I would much rather check out the basics myself before handing it over to another technician.

    Appreciate if anybody can help me out with this.


  • Anonymous May 06, 2008

    Where are the four screws securing the power supply board? No visible screws on the control unit. The main speaker has one 8 screw panel into which all cords go and four screws which don't seem to gain access to anything inside.

  • czcmd_cuarts Sep 08, 2008

    thank u very much for this column , iahve the same problem something had happened on my vs 4121 there is no power kindly help cause i believed altec lansing speaker is a good speaker and i believed that you and altec people can help me a lot.
    thank u much awaiting for your response


  • Anonymous Dec 23, 2016

    It is actually attached by adhesive,it has no you need a thin metal then dismantle from a side by penetrating the metal slowly to the whole round and it will open very easily



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There is no way to open the satellite speaker without destroying it. I tried and found that the whole thing was glued together. Mine is now destroyed

Posted on Jan 10, 2014

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  • Mir Faisal
    Mir Faisal Apr 18, 2014

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  • Mir Faisal
    Mir Faisal Apr 18, 2014

    To open the main sub woofer u need to open the front grill and then open the speaker screws first. To open the sattellite speakers just slide in a sharp tool from the side.

  • Tej Raghav
    Tej Raghav Apr 21, 2014

    Opened mine today. It's so stupid to glue the satellite speakers atleast. The mids are too low in thse, want to do some mod. lets see


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If your VS4121 units have lost power, then why not convert them to unpowered small speakers. The small cable speaker has a red/black that when spliced creates your Pos/Neg to use. Now the large DIN cabled speaker, once spliced has 10 wires to chose from. I found that the GREEN (Pos) and the silver BARE wire is the Neg. Bingo! New life for these little units...

Posted on Mar 31, 2015


There is a fuse on the power supply board which is held in place with 4 screws. Yiu will have to unplug the sub-woofer connector to remove it.

Posted on Apr 15, 2008

  • Chris Rodrigues Jun 17, 2012

    Hey Sunnys3, did you manage to open up the satellite speakers?


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