if u unplugged one of the speakers may be sound back. or u removed the Dell speakers altogether and routed the sound out of the tv and through stereo. There is and audio out on the back of the tv that should connect with connector cables into any stereo/mixer.
may be the head phone jack just plug in some headphones into the TV, and try if sound come out.
Check Sound and Audio Devices Properties in Audio tab,and make some change their
the problem is with the capacitor inside the tv the power is not being transferred from the wall to...
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the problem is with the capacitor inside the tv the power is not being transferred from the wall to the relay and to the capacitor and its too weak to power up the tv they need to be replaced and will cost up to 100 dollars to change them out the part itself is only about 7 dollars but has to be soldered into the board of the tv or something