Check to see if it is properly hooked up to the player, and if it is, then either the amplifier's LFE(Low Frequency Emitter/Subwoofer) channel has failed, or the CPU is not beginning to forward frequencies 200Hz and below to the subwoofer. At 200Hz, the subwoofer adds to the satellite speakers, an then at 110Hz and below, only the subwoofer is playing.
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Definitely need more info - such as type of amplifier or receiver, how many speakers you are running, whether the subwoofer is powered or not.
As a simple test procedure: Disconnect all speakers and plug in a pair of headphones. Get a strong audio signal? Good, move on. No signal or week signal, you have an amplifier issue before the audio even gets to the speakers.
Next: Disconnect all speakers, turn the volume down, and connect one speaker to the left output channel. Slowly increase the volume. If that works, do the same on the right channel. Everything OK? You're putting out enough gain on both channels. Sometimes one channel goes bad. You can still listen to your sound in mono moder, or drive two speakers from the single working output. Not stereo, but dual mono. Move on.
Connect left and right speakers but not the subwoofer. Repeat the test. Whatever is left is probably the problem. If the subwoofer is powered, check the power supply or incoming voltage. If the other speakers are driven off the subwoofer or powered from there, that's likely the problem.
Hello First check whether sound control has been muted or not. If muted, as you know, there will be no output from the speakers. If not muted, and still no sound, there are two possibilities. The first one is of speaker, and the second one is with the audio output IC inside the circuit Check its speaker first. you can check the speakers with the help of a multimeter, of with a torch cell. If speakers are found OK, and still there is no sound output, the audio output IC is faulty and shoul be replaced with same number . The number of the audio output IC for your tV is [TA8265K]. This IC can be located at the main board of your tV. If you have eneough knoledge and tools to do the job, you can replace it at home. If you want anymore assistance from me, inform me by FixYa comment box. I've all the repair details about your tV with me. OK.
Check its wpeaker. If speaker voice coil has splitted inside [ which cannot be detctable]; this kind of fault will occur. Give the output of the Sub to an other known good speaker to confirm. You have to open the Sub and connect the Sub speaker wires to an other one to do this check. OK.
There is tow leads for every speaker. Out of which, one will be marked [+ve] and the other will be negative. The negative terminal of the speaker should coincide with the negative terminal of the respective output terminal from the amp. For the other speaker also, this must be the same with respect to connection. If any one connection in one speaker has been reversed, the sound effect will be effecteed. When we connect in phase, that is [+ve] and [-ve] correctly to both speakers the sound effect will be great. If one among them is reversed, the effect of one speaker will neutralise the other, and the sound spectrum also will be neutralised. Checking this connection whether it has give in correct way is calle "check phase'. OK.
Your burned subwoofer speaker is [16cm] one, magnetically shelded type. If it ahs burned out, before replacing an other speaker, throughly check if there ahs some short to its output circuit. If there is a short, the speaker you replace will also will burn out within seconds after switch ON the set. speaker have a 6Ohm impedence and rated at 60 Watts. Frequency response is 20 to 150Hz. Whe buying one these specifications must be noted. You can open its back cover after unscrewing the fixing screws. Do it very carefully and peacefully. OK.
If you meant that the subwoofer amplifier has the power in then we need to check the amplifier.If your subwoofer speaker is ok after testing with an 1.5 volt cell then you concentrate if the amplifer has packed up., After testing for fuse, speaker connection, speaker wires. you will have to check if your power amplifier output has failed. Since you have not mentioned the make/model i am not able to pin point but you may open and test for damaged output transistors, components and replace accordingly only if you are competant. Hope I could help. Good day
It's possible the sub is defective or isn't getting power from the amp.
Connect the sub to another output temporarily to determine which is causing the problem. If the sub workd on another output, look at the amp. Check that it is powering up properly. Check the onboard fuses and speaker wiring.