What component controls sound on this main board

[mattstolte]

ok this main board is out a vizio lcd it would turn on but no sound so I replaced main and got it to work but id like to fix this and sell it on ebay, but what component can I change to get sound to work? im pretty sure the connector in top right was for speakers

[tom66]

Re: What component controls sound on this main board

Top right is the audio amplifier. There are a few other places where the audio could fail. Usually the audio has a separate power supply, 8V or 9V is pretty typical. That can go missing causing other faults...

[mattstolte]

Re: What component controls sound on this main board

so is there nothing I can replace to fix the sound? I don't have the tv anymore but would like to fix board if I could and sell it

[tom66]

Re: What component controls sound on this main board

Your question is akin to asking how to repair a car that doesn't start. You've replaced some expensive part and it now works, but since selling it, you have no way to test/debug the old part, or confirm that you have fixed it. I don't know what else you expect? Unless someone knows of a common fault, I think you are SOL on this one for now.

[mattstolte]

Re: What component controls sound on this main board

What component is audio amplifier

[budm]

Re: What component controls sound on this main board

That IC are the stereo amplifiers (in this case they are Class D amplifiers) that drive the speakers. You have power amplifiers that drive speakers, and the n you will also have pre amplifiers which drive the input of the power amplifiers, so it is not simple.

[mattstolte]

Re: What component controls sound on this main board

that ic are the stereo amplifiers (in this case they are class d amplifiers) that drive the speakers. You have power amplifiers that drive speakers, and the n you will also have pre amplifiers which drive the input of the power amplifiers, so it is not simple.

so your saying this doesnt have just one ic amp?

[tom66]

Re: What component controls sound on this main board

Very few TVs do.

[mattstolte]

Re: What component controls sound on this main board

and what am I looking for? should I have this on dc volts?

[tom66]

Re: What component controls sound on this main board

Ideally, you'd use a scope to trace the audio signal through the set, which goes to the amplifier IC. It may for example pass through an op-amp or filter stage.