In the socket where you plug in the external earphone are bending contacts, which also switch of the speaker when you are using an earphone. Try either putting in the jack and wobbling and twisting it, or tapping the corner with your knuckle.
IN EITHER CASE - BE GENTLE
That will knock of the dirt and the switch will work again
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The jack where the headphone plugs in is probably damaged. When the headphone is plugged in the internal speaker is disconnected. The switch is part of the jack and does not reconnect the internal speaker when the headset is unplugged.
Most of the Sony TVs have a sound output less that 4W or so. If you connect an external speaker directly, sthe speaker shoud match both in impedence and watts, to the internal speaker fitted inside the tv, otherwise the audio output ic inside the tv can get damaged.
You can connect the earphone output of the tv, if any provided on your tv, to the aux; input of your stereo. There is no trouble.
Plugging-in the earphones physically DISABLES the built-in speakers. Unplug the earphone, to ACTIVATE the built-in speakers. Hopefully, the action of unplugging will move the MECHANICAL contacts -- if that mechanism is broken,
then it's like trying a broken light-switch -- you can flip the switch,
but nothing happens.
HI, THIS IS VISHU HERE, IT SEEMS THAT THERE IS SOME PROBLEM IN YOUR AUDIO SOCKET.THE SOCKET WHERE WE CONNECT THE EAR PHONE , BCOZ NORMALLY WHEN WE CONNECT THE EAR PHONE ON A GOOD WORKING DEVICE IT CUTS THE AUDIO FROM MAIN SPEAKERS/MIC AND ROUTE IT TO EARPHONES , THIS FUNCTION IS PERFORMED BY METALIC CONTACTS PRESENT WITHIN THE SOCKET THE PROBLEM IS WITH THESE CONTACTS MEANS THESE CONTACTS ARE REMAINING IN CUT OFF POSITION EVEN AFTER REMOVING THE EARPHONE . TRY TO GET UR SOCKET REPLACED , HOPE IT WILL SOLVE UR PROBLEM.