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if their is a sound from the internal speaker then the problem is with in only in the earphone jack or in the connection. to access the internal part of the tv you need to remove the rear cover. locate the earphone jack terminal re soldered and check the connection at the board ( PCB). you can check also the continuity, attached powered pc speaker then use an analog tester and check weather their is a connection coming from the stereo input jack going to the terminal of the earphone jack of the tv. if no connection replace with new earphone jack. good luck hope this can helped.
It's probably _not_ the soundcard (chipset), but the teeny little crummy speakers built into the T42. On a thin, light laptop the manufacturers have to make some compromises, and one of them is that they give you miniature speakers that aren't much good for music reproduction.
The fix: either uses earphones or plug in external speakers into the earphone jack. You can get pretty good, pretty cheap external speakers that give you fine sound.