Question about Altec Lansing ADA995 Speaker

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Altec Lansing ADA995 does not work

Came with Dell desktop. Stopped working. Got nothing when checked using the rear panel diagnostic jack. Fuse is good. I need a schematic of the subwoofer assembly. Any ideas? Thank you.

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  • Anonymous Oct 04, 2008

    Might as well kiss these speakers goodbye. I inherited a set and think they are the best sounding speakers around, but, they are poorly made. I mean REALLY BAD. My first set blew with two loud pops. I tried to take the sub-woofer cabinet apart to get to the electronics and it was sealed--forever. These were not intended to be services, but thrown out. I had to take a Roto-Zip to cut the side out of the cabinet and when I got to the electronics I could not tell which caps had blown. Long story short, I threw them out.



    I then found a set on e-bay and thought I had died and gone to heaven. I paid the guy $125, he shipped them, and I was happy for a couple of months, then this new set blew up. Screw it, I'm giving up on these pieces of junk, which, by the way, neither Altec Lansing nor Dell supports (I called both) and, this comes as no surprise, they're made in Japan. Thanks, Altec Lansing, for using your good name to produce junk.



    Ah, I feel better.

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This is my Dell Altec Lansing 5.1 (ADA995) surround sound amplifier for my computer. There is a design flaw where the board gets corroded due to the fact they caulked or glued it togther and left some of the circuit board hanging out. Just thought I would point out my findings in case some of you had the same system. It's a relatively easy fix. I got all the parts from Newark for about $30.00, and it took roughly 2 hours. Original Amplifier Chips below:
Altec Lansing ADA995 does not work - 8_18_2012_3_19_35_am.jpg

Positive Voltage Regulator is blown out:
8_18_2012_3_28_01_am.jpg

Notice the traces where corrosion caused a short:


Another Altec Lansing ADA995 does not work - 8_18_2012_3_30_13_am.jpg:

8_18_2012_3_30_13_am.jpg

This resistor was blown out.
I pAltec Lansing ADA995 does not work - 8_18_2012_3_31_59_am.jpgok the picture I went ahead and replaced all of the 4.7 ohm 1/4 watt resistors:8_18_2012_3_31_59_am.jpg

BlownAltec Lansing ADA995 does not work - 8_18_2012_3_33_48_am.jpgistor:8_18_2012_3_32_37_am.jpgNew goods!8Altec Lansing ADA995 does not work - 8_18_2012_3_35_55_am.jpg class=

Just before surgery on the amp chips:
8_18_2012_3_35_01_am.jpg

Re-jumpered the traces:

Re-jumpered the traces:8_18_2012_3_36_44_am.jpg Boy that "Heat Sink Transfer Paste" is really messy!!!:8_18_2012_3_37_26_amAltec Lansing ADA995 does not work - 8_18_2012_3_39_35_am.jpg><br><span>A
peek at the underside:</span><img src=

8_18_2012_3_38_35_amAltec Lansing ADA995 does not work - 8_18_2012_3_41_02_am.jpg>

<p>New L7815CV Positive Voltage Regulator (Shown here):<br><span>New L7915CV Negative Voltage Regulator is on the
back side:</span><img src=

New amp chips are all nestled down in their new home!:
8_18_2012_3_40_22_am.jpg

Boy that's a big heat-sink:
8_18_2012_3_41_02_am.jpg

Time to try it out. And it works. Boy, going a week with out 5.1 audio on your computer is terrible! Nobody should have to live that way or be subjected to that kind of torture. I guess this would be considered a "first world problem"!

-Jason-

Posted on Aug 18, 2012

  • johnguitar3
    johnguitar3 Sep 10, 2012

    What screws did you have to remove to be able to take out the circuit boards? Did you have to remove the 2 large port tubes? My center channel output and subwoofer aren't working (tested with diagnostic jack on sub), and I'm trying to get to the circuit board to look for any fried components.

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I've managed to fix the amp in the ADA995 when I blew the rear channel amp. There is a design fault with the voltage regulator that causes it to run very hot, which frys the plastic housing glued near it, which corrodes the circuit board trace.

Getting the sub/amp apart is a *****. But doable. You need to not only remove the screws in the back under the flat grills, but ALSO 3 screws behind the top speaker that also hold the amp in place. And getting the power supply out is another rather difficult procedure, which is needed if you want to run the amp on the bench to troubleshoot.

Posted on Apr 22, 2012

  • Travis Chastain Jun 27, 2012

    Alan, do you have any advice on opening the sub? I removed every screw I could see and nothing budged (except something inside when I removed the bottom screws). I'm assuming I need to make an... incision somewhere? I just don't want to ruin it in the quest to replace bad components.

  • Richard Cypher May 20, 2015

    Where can I find those 3 screws behind the top speaker

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Does the unit have a fuse??

If so I would start there, making sure that I replace it with a like fuse.

I don't believe you are going to find a schematic outside of a repair center. Leaving you with a repair center or replacing the speaker system.
Looking quickly on the web, I see a great many refurbs not sure why, but a question.

john




john



Posted on Aug 20, 2008

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Posted on Jan 02, 2017

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