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Try switching the external/internal speaker switch on the back of the tv to internal. This way you should at least get sound (from the TV not the sound system) when you change the volume of the TV itself.
Explain your set up if you need more help. By that I mean what do you have hooked to the TV and sound system, Satellite or digital cable box DVD ?
Make a note of where all the inputs to the sound system come from.
Hi, I can help. It sounds like the TV internal speakers were turned off so that the only speakers to have sound were the external ones. Go to your menu and find the sound area. There you can tell the TV to send sound to the internal speakers once again and not to external.
On the back of your set there are 2 switches that tell the tv whether you are using the internal speakers or the external speakers.
Make sure the switches are set to internal so the speakers in the TV receive the sound signals. If they're set to internal maybe the internal speakers are bad. Set the switches to external and hook up external speakers to the speaker terminals on the back of the TV. If neither setup works then it sounds like an output transistor or related parts.
Check your TV menu and see if the internal speakers are turned off. Sony opts to cut sound to the internal speakers when you have an external audio amp hooked up for sound, hopefully for obvious reasons. Most audio amp problems inside the TV will result in 9 blinks of the red power light and the TV failing to turn on. If that doesn't help, you may need to have the set repaired.