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Re: No sound from headphones connected to speaker
I may be too simple of an answer but that would happen if the headphones weren't plugged all the way in. If there is a bend in the connector and it's hitting the speaker they may not be plugged in all the way.
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Normally , you would expect the TV sound to stop when headphones are plugged in. Obviously not in this case. If you have a set of headphones, try them and see if the TV still has speakers on. If it does, then there may be a setting on the setup of the TV to get headphones to work. If the TV speakers stop, then I would think that the Logitech are not compatible with the TV. The only other thing would be is to get into the TV and disconnect the TV,s own speakers. If the wires are soldered on and not terminal connected, carefully cut 1 of the wires off near the speaker. If 1 wire is cut, the speaker wont work. Make sure both the TV and the additional speakers (If they have their own power supply) you are using are unplugged from the power before you go doing this...!
If the head phone jack works its more likely to be the problem, if you use the headphone jack a lot the connections inside it can get worn or bent out of shape--engaging the headphone jack should shut the speakers in the unit off.
Other possible reason is a bad speaker or connections.
The problem is in the earphone jack, when you plug headphones into the jack it dis-connects the internal speaker. Since you can hear the sound through the head gear, it indicates the jack is defective and needs to be replaced, or it needs a good flushing of electronic contact cleaner, attach the supplied straw and aim it in the jack and spray, next take the headphone jack and push it in and out quickly, repeat the process three or four times, If this fails the laptop will need to be dis-assembled for continued repair.
The headphone jack on the TV has switch built-in to kill the TV speakers when headphne jack is used, you need to use powered PC speakers with headphone jack and connect this PC speakers to the Audio line out of the TV set (RED and WHITE RCA audio line out). Basically the powered PC speakers are being used a headphone driver. Or you can get one of those wirless headphone system instead.
Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.
I would say it is because the unit does not have a built in amplifier. The speakers are powered PC speakers of studio monitors I am guessing. Try plugging the headphones into the headphone jack of the speakers if they have a headphone jack or try a set of powered headphones out of the Edirol and see if it helps.