No sound from tv when connected via laptop

I have an acer travelmate TM8371G-944G32n configured with windows 7. I have connected the laptop to my lg lcd tv via a vga? connection, the sound is connected via a lead with red and white plugs one end and a single plug the other the red and white lead is connected to the sound on the tv and the sinle plug to the headphone jack on the laptop. I have a picture from laptop to tv but no sound. What am I doing wrong?

Ps forgot to mention I have a yamaha soundbar connected to the tv could this affect it?

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More about sound connected laptop
  1. It depends on the TV. On some models you have to select the audio input in the menu. And try to unplug the soundbar for a test and use the use the build-in speakers. If that doesn't work, post the TV model, so we can download the manual.
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