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Old 05-20-2011, 03:56 AM   #1
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Wavy Lines in TV

I recently had Newmar change out my analog TVs to digital in my 2004 gas Mountain Aire. I've always had very faint verticle wavy lines (like an oscilleoscope sp???) on the analog tvs, but now they are very apparent. They only show up when I'm useing Direct TV, not when I'm receiving standard broadcast signals. All power for the TV, Direct TV receiver and switch box come through a small inverter. I think my problem is related to the inverter and the direct tv receiver is getting a "dirty" signal from the inverter. Does this make sense? Is there some kind of AC Filter I can get to clean up the signal? Like I said, when I receive only broadcast / over the air channels, I don't have the problem, even when I'm still getting the power from the inverter.

Thank in advance

Jack
2004 Mountain Aire 3651
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Old 05-20-2011, 06:58 AM   #2
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How is the tv connected to the Direct TV box? I would replace that cable first. If it is coax I would try a 3 plug RCA if posible.
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Old 05-20-2011, 07:04 AM   #3
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"Small inverter" May I assume it's an MSW type?

(No, I may not assume it is an MSW type,, It's not an assumption, it IS an MSW type)

How do I know this? Experience of course.

Visit the Xantrex upport pages, for the X-Power line (MSW) and you will find a document with a title like "Things that may now work well on MSW" or some such.

Try the Prosine support pages (True sine wave) No such document.

The problem is the filters in the TV power supply are not up to smoothing out the hash from the MSW inverter... With a True Sine wave.. No hash, so no problem.
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Old 05-20-2011, 07:30 AM   #4
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I have had a problem in the past, with fluorescent lights. They send out a signal that picks up on the TV. Try turning off all the fluorescent lights.
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Old 05-20-2011, 09:29 AM   #5
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If the symptom is isolated to Direct TV channels I'd start there. Is it possible to connect the receiver directly to 120VAC, shore power?
I wonder if your receiver is unable to filter out noise from the inverter. You didn't mention what type Satellite antenna you're using.
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Old 05-20-2011, 11:45 AM   #6
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Thanks to everyone for the responses. I contacted the company that makes the inverter and they were positive that it was the problem because it is not a true sine wave inverter. Their only solution was to change the inverter.

Jack
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Old 05-20-2011, 01:06 PM   #7
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Hi jfwandrn,
Before you go to the expense of replacing the inverter, try the cable solution mentioned in an earlier post. Before you try the cable solution, have a helper watching the TV and wiggle the cable connections that would affect Direct TV. See if anything changes. For whatever reason I've had cable connections go bad. They were not loose or corroded, but the wavy lines disappeared when the cable was replaced. It's a cheap and easy step and might save you some $s.
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Old 05-20-2011, 05:20 PM   #8
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Quote:
Originally Posted by jfwandrn View Post
Thanks to everyone for the responses. I contacted the company that makes the inverter and they were positive that it was the problem because it is not a true sine wave inverter. Their only solution was to change the inverter.

Jack
One thing, if it is the inverter, Try it on shore power to see if that "Fixes" it, THEN change the inverter.
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