Question about Labtec LCS 1040 Computer Speakers

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Wiring internal board of labtec computer speakers

Having trouble figureing out how to re-wire internal board of Labtec LCS-1070 computer speakers.

The speakers still powered on, but lost sound, so I took it apart and the wire leading from the internal board and the on/off volume knob came apart (separated from another wire). The other wire it was hand taped together to was the wire that gets plugged into the computer. It led to the source (the computer output sending the sound to the speakers).

Now I can't figure out how the wires should be attached back together.

Stipped down, the wire from the board or the volume on/off knob contains a green, yellow and main shield wire. These were attached to a source wire which gets plugged into the computer and it contains a red, white and shielded wire.

How do I properly reconnect the power knob wire (the green, yellow and shielded wire) to the wire that leads to the source (the red, white and shielded wire)? I know these two go together somehow because I took them apart myself and they were not connected to anything else. Just to each other.

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The shielded wires are for ground, so they get connected together. Plug the wire into the PC and run some music. Then touch each wire to the others. You only have a couple of combinations to and white-to-yellow, or red-to-yellow and white-to-green, . You can do this while the PC is one and music playing until you get sound thru the speakers. There virtually no current running thru the wires and you can't hurt the PC by doing this.
If the speakers use an external power supply, have it plugged in and working when trying these connection options.

Posted on Sep 07, 2009

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I connected like this didnot working wiring internal board of labtec computer speakers - 882aed92-be83-4b40-a0c0-6f92b94dde51.jpg

Posted on Oct 14, 2014


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Red is always the positive (+) terminal and black the negative, ground, (-) terminal. FYI-though people use the term ground it is not correct.

Another thing you should know is red and black are relative. Inother words, when red to red and black to black it will cause an outward motion of the speaker. If you happen to reverse them, red to black, it just causes an inward motion of the speaker. Sometimes this is refered to as the "phasing" of the speaker.

Speakers are usually marked at their connection points with a red dot or a (+) for the positve and a black dot or (-) for the "negative" side.

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Hope this helps.


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Good day!
First things first:
1) you only can find those schematics on,CRID=3
but have to call or email support.
hope they can send the info.
Open Sky

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