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Re: altec lansing xa2021 computer speakers
Bad board, inside of your speaker system, time to RMS or use the warranty, if you register your product, this could be easy.
Some boards , depending on energy at home voltage, etc, can be damage, and sometimes fried the board, for a energy fluctuation. Consider to use warranty, or RMS, in this case.
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check the volume adjustment first, if ok tried to hooked up a powered pc speaker at the earphone jack of the tv. if you get sound there it could be the speaker is worn out. if can get sound from the earphone jack, the amplifier circuit or the amplifier ic was defective.
if their is a sound from the internal speaker then the problem is with in only in the earphone jack or in the connection. to access the internal part of the tv you need to remove the rear cover. locate the earphone jack terminal re soldered and check the connection at the board ( PCB). you can check also the continuity, attached powered pc speaker then use an analog tester and check weather their is a connection coming from the stereo input jack going to the terminal of the earphone jack of the tv. if no connection replace with new earphone jack. good luck hope this can helped.
if they are usb powered, a light should come on on the spkr box with the controls on it, if it is powered by AC, make sure the wall wart is plugged in. If you are getting power to the speakers, try plugging in your mp3 player or some other device with headphone out jack. If the speaker work when you try that, the problem is in your computer and you should go to the sound section of control panel and open the "mixer" to see if sound is "muted", if it is, unmute it
Try this first before we conclude that you're Output ic faulty.
1. Check if mute is on.
2. If it has an earphone jack, hook up your headset to confirm if there sound coming out. If you hear a sound on your headset, the fault is in the earphone jack.
3. Check if the speaker selector is on (if it has).
If you've already try the above steps and the symptomn still there then it has a high chance that you're output IC is the caused of the problem.
You need to send it to repair shop to isolate the problem because pre-amplifier stage is also going to be check.
Hope it may help you.
Have a nice day!
If it has an earphone jack try to hook up your headset just to get hint if your problem is in the sound output ic. Listen carefully to your headset if there is a sound or none. If you hear a sound then you the trouble is in between the earphone jack or to your speaker. Just test the speaker and you will isolate the problem. How to test the speaker if good, simple got a battery (either AAA,AA,C,D size) then tap the speaker across the battery when you hear a crackling sound then it is good. If you confirm that the speaker is good then the faulty parts is your earphone jack, replacing it will cure the problem.
If you don't hear a sound then through your earphone then the trouble is in the output I.C. or some parts around it and you need a technician to isolate the problem.
If you don't have an earphone jack then I've advice you to look for a qualified technician to look for a defective parts on the sound section.
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Check the wires.
One wire should end with a thin green pin.
Connect the green pin to the green socket on your computer.
If there is a black pin, you have a sub-woofer, and the black pin
connects to the black socket on one of the speakers.
Connect the wire with the 2-prong silver plug to AC power, e.g., to a power-bar.
make sure that the speakers are plugged into the GREEN circle on the back of the machine, and make sure the volume controls in windows are turned all the way up, and mute is NOT checked. If that still does not work, hook the speakers up to an ipod, walkman, boombox, or anything with an earphone jack, and see if they play. If they work, then its a pc issue.