Question about Altec Lansing AVS 500 Computer Speakers

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Rippling vibration in sub woofer seems to be transformer related

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The power supply outputs DC voltage so there is a 2200uF cap inside it.  If this goes bad you get a humming out (usually from the base speaker) even at minimum volume.  Inside the base there are 3 TDA2007a 6 + 6W stereo amplifier 9 pin inline ICs, one voltage regulator IC, 5 other ICs, 2 more tiny transistors, 1 2200 UF capacitor, plus a bunch of small caps. Usually one of the TDA2007a amp ICs has gone bad (in my case it was the one that drives the base so the popping sound was coming out the subwoofer).   The TDA2007a seems to be a faily common audio power amp IC.  The main problem with the Altec Lansing AVS500 is that there are no screws to be able to take apart the base so you have to brute force pry it apart and then the jacks and controls are also glued onto the front plastic face of the subwoofer so that must be carefully pryed apart also to get the small circuit board out to be able to work on it.  It's all too easy to break something if you're not carefull, but what the heck, if the speakers aren't workiing you don't have anything to lose and if you are proficient with a soldering iron and have or can get a TDA2007a audio power amp IC you might be able to repair it.   My own speaker problem was easy to determine as one of the TDA2007a was overheating super quickly after plugging in the power.   Good luck to anyone else attemping a repair.

Posted on Jun 26, 2009

  • guruMarkB Jun 26, 2009

    If you are only experiencing a humming out of the base then just replace the power supply.

  • Cat_in_aShop Sep 30, 2010

    The humming sound starts when the IC gets overheated. I would not say for sure that the IC is bad because the sound is Ok you just have to keep it cool. Put a wet napkin on the heat sink ( make sure that water does not touch body of IC ot it will crack it and probably kill the IC). Mine works fine long time whis way. I suspect that some component on the board, probably a capasitor goes bad takin the IC off proper mode. It's hard to say without osciloscope, but presence of sound and not burned speaker means that final IC amplifier's pair of transistors is not dead or burned, it's just off ballance.


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How to connect headphone with computer pc to use for video call

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i had same problem with my magaworks 5.1 thx550.
i have tried to find solution in web but it was only one which voltage sense resistor 2Mohm track in PCboard was damaged.
after check PCboard in my megaworks thx 550 i found that tracks are quite well and voltage sense resistor is well too.

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3_12_2013_8_48_15_am.gif7- now it is time to re assemble electronic parts very carefully and prepare for test. it is better to use isolated transformer and put a lamp in serial to protect PCboard against short circuit. if green LED (POWER LED) is on it means that every thing is O.K.
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after replacing damaged parts my THX 550 is working well maybe for next 10 years.
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Please rate if this helpful

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