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Coaxial cable does not carry video signals but rather rf-signals
To use coax you will have to tune like you are searching for a signal from your aerial..
If you prefer to use video then you will have to use a video cable either rca or hdmi. you can then choose video or hdmi from the remote
I had the same problem with my dell tv. It's the exact same one you have. It kept making noise at first, and then the sound just went out. I changed the speaker wires to a slightly stronger, thicker wire and now it works great!! I hope this works for you.
We also have a 32" LCD Dell flat screen tv #W3201C that has no sound. It's about 2/12 yrs old. One speaker started having a problem and we disconnected it. That was a couple weeks ago, now there is no sound at all. Dell should not be let off the hook so easily. Obviously there is a problem with the tv and it should be Dell's responsibility to make it right. Does anyone know if a class action suit has been initiated?
Don't bother with DELL if out of warranty, they can't fix it.
Have the same model and same problem probably It is a bad inverter board, in my case one of the 16 transformers is burnt out on the inverter board. still trying to find a replacement component. if not replacing the board is the only option or getting the inverter board repaired.
by the way, this TV has a Samsung panel: model LTA320W2-L03. so it needs parts for a Samsong not a DELL. DELL does not manufacture or fix them becuase they don't make them