vizio tv e420vo No audio

[ealequi]

Re: vizio tv e420vo No audio

i am getting no reading on 7

[tom66]

Re: vizio tv e420vo No audio

Other readings?
Measuring using a scope, of course? You are tracing audio, not DC voltage.

[ealequi]

Re: vizio tv e420vo No audio

there is no voltage on 8 or out put on 7

[tom66]

Re: vizio tv e420vo No audio

Just to be sure what settings are your scope set to.
Lack of voltage on pin 8 is not good, as that should be the opamp power supply.

[ealequi]

Re: vizio tv e420vo No audio

I use the multimiter on vdc

[tom66]

Re: vizio tv e420vo No audio

But you said you had a scope?? I am lost. You must measure those pins again with scope to determine if there is a signal or not.

[ealequi]

Re: vizio tv e420vo No audio

i am trying to make sure that the scope is working.

[tom66]

Re: vizio tv e420vo No audio

Use the probe comp or probe cal output to test the scope. Hook probe to it and look for square waveform.

[ealequi]

Re: vizio tv e420vo No audio

ok, i am getting voltage with the scope, i just dont know how much.

[tom66]

Re: vizio tv e420vo No audio

Please watch this video to understand how to use an oscilloscope.
It applies for analog and digital scopes.
https://www.youtube.com/watch?v=hUIgAu3QQWQ

[ealequi]

Re: vizio tv e420vo No audio

i got voltage on pin 8

[tom66]

Re: vizio tv e420vo No audio

How many volts?

[ealequi]

Re: vizio tv e420vo No audio

.8v

[ealequi]

Re: vizio tv e420vo No audio

4.6v on 7 pin

[tom66]

Re: vizio tv e420vo No audio

.8V is not enough, double check that is good.
Then you need to repeat all previous readings with scope, looking for the audio signal on 100mV/div at 10ms/div, of course TV should be playing signal.

[ealequi]

Re: vizio tv e420vo No audio

i set the square to 5v and went i tested it it go 2 1/2 square wish is 12v if i'm not mistaking. Like i said i has never used it until now

[tom66]

Re: vizio tv e420vo No audio

Can I see a picture?

[ealequi]

Re: vizio tv e420vo No audio

[tom66]

Re: vizio tv e420vo No audio

Connect probe to PROBE ADJUST.
Volts DC to 0.1V/div
Time to 1ms/div
Select CH1 only

Show me what you see.

[ealequi]

Re: vizio tv e420vo No audio