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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...!
Usually the headphone jack has a contact that's "made" by the 'ring' section of the jack when you push in the plug, which bypasses the speaker circuit (that's what automatically silences the speakers when you plug in the headphones when there are no switches to turn the speakers on/off manually)... if the 'ring' strip got bent somehow so it's pressing against that contact all the time, it won't let the speakers' circuit come out of bypass. Look inside the jack with a flashlight... the sideways Vs that touch the 'ring' sections of the stereo headphone plug should be about in the middle of the opening... if they're pushed over too far it may require disassembly to bend them back to the proper position.
The only way to do it (unless you go inside the TV and modify the TV) is to use a small headphone amplifier (or powered PC speaker system with out headphone jack) and connect it to the AUDIO line out (Red and White RCA jacks) on the back of the TV.
This is likely a bad switch contact in the headphone jack... they are really poor quality in most amps... plastic case and EASILY damaged by side forces on the jack. REplacement is the solution.
If your TV does not have headphone jack outlet, then there is not much you can do, the Audio line level out RED and WHTIE RCA jaks are not made to drive headphone directly, it does not have enough power to drive low impedance load such as headphone which has about 8~32 Ohms impedance, the line out RCA is made to drive high impedance load 20,000 Ohms and higher.
If you want to use headphone, what you can do is to get cheap powered PC speaker system that has headphone out jack, then just connect the powered PC speaker to the audio line out of the TV, but the TV must have an option on the audio setup to turn off the built-in speakers.
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