🚀 go-pugleaf

On 26 Jul 2005 21:15:00 -0700, "alitonto" <alitonto@hotmail.com> put
finger to keyboard and composed:

>Problem with grainy picture at TV and via VCR tuner only through RF.
>Lots of tests done as previous posts but no change.
>Anyone familiar with I/C TDA8305a, could you please look at these
>readings and see what you can recommend:
>
>pin 1 at 5.4     AGC take over - okai
>pin 7 at 11.75v  supply voltage - okai
>pin 5 at 7.84v  tuner AGC  (too high) -     should be 3.9 as per tv
>schems
>pin 18 at 11.18  AFC output(too high) - should be 6.28 as per tv schems
>pin 19 at 4.29   AGC detection (too low)-   should be 6.18 as per tv
>schems
>
>Is there some relationship between these pins which could point to the
>problem?
>Thanks very much.
>Al

In a previous post you stated that you were able to watch VCR tapes
through the TV. Was this via the tuner or the AV inputs? If tuner,
then what were the voltages on the AGC and AFC pins? If normal, then
this would point to a weak tuner or weak antenna. Do you have a second
TV to compare?

FWIW, a datasheet for the TDA8305A is here:
 http://www.nteinc.com/specs/7000to7099/pdf/nte7047.pdf


- Franc Zabkar
-- 
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