Need a little help troubleshooting a tv

[Mac Cool]

I bought a used Sanyo DS27930 television for a 2nd tv and there are faint
whitish lines running through the screen when I watch [digital] satellite
through the coax, also a steady hum. It doesn't happen on component or
composite. The picture on coax also isn't as good as the other two. I
never noticed the problem on my old 20" TV.

I've had one person suggest it was a bad tuner, while another suggested
it's a ground loop. I'm not sure how to fix a ground loop problem on a
satellite coax but I suspect that would be the easiest to try first.

Rick

 

For the HUM: If u have non-polarized AC plugs on any of the pieces,
try reversing them. If u have more than 2 pieces it could get
confusing. If all are polarized plug them all into the same power
strip or verify the house wiring is correct RE grounds and neutrals.

Are the whitish lines single traces or bands?
Are they horiz or vert?
Are they moving or stationary on the screen?
Horiz Bands could be cause by the same thing as the hum.

Single moving traces (or multiple ones together-but not a band) could
be electrical arcing from a nearby motor or other device.

Vertical lines could be a defect internal to the TV.


On 19 Jun 2010 21:38:46 GMT, Mac Cool <Mac@2cool.com> wrote:

I bought a used Sanyo DS27930 television for a 2nd tv and there are faint
whitish lines running through the screen when I watch [digital] satellite
through the coax, also a steady hum. It doesn't happen on component or
composite. The picture on coax also isn't as good as the other two. I
never noticed the problem on my old 20" TV.

I've had one person suggest it was a bad tuner, while another suggested
it's a ground loop. I'm not sure how to fix a ground loop problem on a
satellite coax but I suspect that would be the easiest to try first.

Rick