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From: barry@hprmokg.HP.COM (Barry Fowler)
Newsgroups: sci.electronics
Subject: Re: Help needed troubleshooting B/W TV
Message-ID: <10040028@hprmokg.HP.COM>
Date: 6 Nov 89 19:32:38 GMT
References: <107@cupcake.sal.wisc.edu>
Organization: HP Networked Computer Mfg. Operation
Lines: 21

cook@stout.ucar.edu (Forrest Cook) writes:                     

In article <107@cupcake.sal.wisc.edu> jwp@larry.sal.wisc.edu (Jeffrey W Percival) writes:
>I have a 22-year old Panasonic TR-205 B/W TV (transistors, no tubes).
...
>Now I have more subtle problems:  mainly, a very
>grainy picture.  Very white-noisy.  Otherwise, stable (no roll, etc.).

That sounds like the first RF amp stage in the tuner is dead.
I would suggest removing the tuner and replacing the transistor that
is nearest to the antenna terminals.  Be prepared for some micro
surgery,  The parts are usually crammed in pretty tight.
One word of caution: be careful not to bend the coils or you
will detune the tuner.


---------------

I agree, check the RF amp.  One other possibility is an IF amp. transistor
or the obvious, any small wires connecting to the tuner (especially the
balun wires).