Hi satisfy_2liv,
The fault was came from the headphone jack itself, when you connect the headset to this jack, it will open the internal contact to the speaker of the TV and you will hear the sound only in the headset. But the problem is, it will not get back to contact once you pull-out the headset to return the audio signal to the speakers. This may probably has a dirty contact or totally faulty. Bad solder joints is also to consider in that area. First you may spray contact cleaner to the jack while inserting and pulling the headset plug. If symptom still persist, check the board for bad solder joints. If the joints isn't the problem,replaced the earphone jack and your unit will back to normal again.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
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