installing headphone jack
Doesn't the TV have AV output, cause then you could plug in a conversion circuit to use with the earphones.
If you wire up a female jack connector correctly, then when you plug in the male connector, it breaks a switch, this would be used to break the circuit for the speakers.
I wouldn't recommend that you attach earphones directly to the speaker wires, you WILL blow the earphones, and subsequently your ear-drums.
If you give me some time, and hopefully between homework, I may come up with a solution. Perhaps someone else may have an idea, if not better than mine may be.
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