Re: How to confirm a TV tuner is at fault?

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#521

From: alitonto
Date: Tue, 19 Jul 2005 01:05

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Thanks Phil
Although your suggestion sounds interesting, are you suggesting that
tuners should have a voltage adjustements in place?
I am sorry but I am confused as to what is there to gain from trying
your suggestion.
I guess what I am trying to establish is if the higher voltage
appearing at the AGC pin could be caused by another circuit part or IC
etc.
Thanks.

Phil Allison wrote:
> "alitonto"
> >
> > re Teac TV ctm687 This is further to my previous post 17/7/2005.
> > After performing many tests on the circuit I find the AGC voltage to be
> > higher (7.84) than it is required at I/C TDA8305A (3.9).
> > I am not sure what other things to try before actually desoldering the
> > tuner.
>
>
>  **  Try pulling that AGC voltage down to 3.9 volts or so.
>
>  Use a suitably chosen resistor to ground or maybe a 3.9 volt zener.
> 
>  See what happens.
> 
> 
> 
> 
> ........    Phil

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From: "alitonto" <alitonto@hotmail.com>
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Subject: Re: How to confirm a TV tuner is at fault?
Date: 18 Jul 2005 18:05:13 -0700
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