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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...!
Normally, when headphones are plugged in, the TV speaker is automatically muted. To use the headphones, leave the TV volume at a normal level, and the speaker sound should stop when the headphones are plugged in.
What kind of headphones and TV are you trying to make work as an combined pair? It sounds to me as though you have your head phones plugged into the speaker location on the TV which could be a small hole that shows a pic of speakers. Look on the TV for an 'mic' or 'pic of headphones' holes. If there is an plug in hole with either it states mic or shows a pic of headphones plug the headphones into that hole instead of where you have them plugged into now.
Another suggestion is to use MDI cords in which you may already be using aka white, red, yellow colored plugs. If those plugs are assembled in the slots incorrect that also could be the reason as to why the headphones turn down when you turn the volume to the TV down; which also would influence the TV volume its self to also disengage to go either louder or quieter. MDI cords should be plugged in the following pattern to be categorized as the following with each color following the next color; yellow, white, red. Now if you are using MDI cords presently do you have them plugged in front or back of the TV?
If the TV has hole ports in both front and back for MDI cords then reverse your plug ins. Example: If you have them plugged in the front instead switch all three to the back of the TV or vise versa.
Also another thing; since you are wanting to use headphones for your TV speakers instead of the TV speakers themselves usually plugging headphones in are controlled by TV volume buttons; however I am assuming that you are trying to state that when you plug headphones into the TV you still hear the volume in your ears and anyone in the TV room is also still hearing the TV even though headphones are plugged in, am I right?
With you wanting to cancel the speakers on the TV out only attempted to use TV volume for speakers and without it working means you have the MDI cord plugged into the audio which would cause the TV to power the volume for the headphones anyways. May I ask this; since I am a bit confused, alright are you wishing for the headphones to be able to be loud enough so the TV only powers them for volume when you use the TV?
I know that headphones being plugged into an TV should only keep their volume within the ear buds. Therefore I have never heard of headphones being able to be loud enough to power out room sound. Instead they power internal volume which would be within your ears. Headphones were meant to keep noise and volume from surrounding a room to block room noise out and to keep the sound for your/ an own persons only listening capability. So because of this I am confused as to how ear phones would have the ability to sound the room with audio.
I can understand that if what you are trying to say is that the speakers on the TV still output volume even with head phones plugged in which would be an issue, since head phones are to capture the volume and noise from the unit in which plays aloud- to actually silence it instead- for the individual whom requires or presumes to have themselves to be the only listener.
Most televisions have a setting that controls whether the TV uses its internal speakers or sends the sound to the audio out jacks for an external amplifier or speakers.
Try going through the settings menu and follow through the audio/speaker selections and confirm that the TV is set to use external speakers.
if you have a stereo unit(am+fm reciever) that has output to speakers, connect the out jack of the tv to input on back of stereo unit(aux in or cd input) then you can have output to headphone and speakers also.