In article <6cqdnVUs_tc2bL3VnZ2dnUVZ_jydnZ2d@[EMAIL PROTECTED]
>,
gdunn@[EMAIL PROTECTED]
says...
> Ed Powers wrote:
> > Hi Phil & group,
> >
> > Thank you for the responses. As I tried to explain, sometimes
the
> > bars were more dispursed and didn't affect the picture -- that's how
it was
> > when the cable guy left - but they drew them selves down to about 2"
and
> > were much more pronounced (affecting picture)that afternoon. Today I
tried
> > something - probably the first thing I should have thought of - I
simply
> > disconnected the coax input to the cable box - problem went completely
> > away - nice clean gray screen with absolutely no bars! When I hook
the
> > input from the cable company back to the cable company tuner - bam,
the
> > problem is back (with the tuner turned off ) - green and magenta bars
> > traveling up the screen! Even thought the cable dude brought a
computer
> > and said that the signal was OK - I'm quite certain the interferance
is
> > coming down the line. I suspect when I show them this the next time,
> > they'll realize that it IS coming down the line -- the cable dude saw
the
> > lines (dispursed) on both cable boxes but didn't know what the problem
was.
> >
> >
> >
Thanks
> > again / any thoughts? Ed
>
>
> Two words... ground loop.
>
> There are two different ground circuits being fed to your equipment -
> one to the cable box, the other to the TV - and one of them isn't really
> a ground. When the cable guy fed the signal to his PC, he wasn't
> connected to the same ground your TV is, assuming his PC had any ground
> (which I highly doubt), and the problem didn't present itself to the PC.
>
> Fix the broken ground and the problem will clear up.
>
This is absolutely the correct answer. Been there, done that.
CB
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