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Line moving up screen?

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Old 10-01-2008, 10:20 PM   #1
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Default Line moving up screen?

Hey all, I recently purchased a 32" Viewsonic LCD HDTV. The TV displays great HD cable content from the HD channels, however I have a very faint "line" or "bar" moving up the screen very slowly towards the top, and it loops around and starts back from the bottom. The cable box is hooked up to the TV with component cables. Is there some setting I missed or do I need to calibrate the TV or something? Thanks!
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Old 10-01-2008, 10:44 PM   #2
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Try moving around the component cables to see if it changes the bar at all. It very well could be interference from running parallel to a power cable which could be causing the issue. Video & audio analog cables should NEVER be run along side a power cable for this reason.

Hope this helps!
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Old 10-02-2008, 10:33 AM   #3
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Also, do you have grounded electrical outlets in your house? Is the TV connected to a surge protector?
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Old 10-02-2008, 03:37 PM   #4
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Quote:
Originally Posted by Loves2Watch View Post
Also, do you have grounded electrical outlets in your house? Is the TV connected to a surge protector?
Good point!

The OP should also make sure all connected devices are plugged into the same outlet as this could also be a sign of the ground loop issue too.
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Old 10-05-2008, 02:31 PM   #5
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Quote:
Originally Posted by Loves2Watch View Post
Also, do you have grounded electrical outlets in your house? Is the TV connected to a surge protector?
The TV is connected to the same surge protector as the cable box and all of the other electronic devices. The component cables are running somewhat near the power cable, but the way everything's wired up I'll have to rearrange the wires and report back. Thanks!
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Old 10-06-2008, 09:28 AM   #6
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Still sounds like a ground loop issue. Even though all your devices are grounded together, it's possible that it's the coax cable is what is giving you trouble. I would think that the cable box would ground it, but perhaps not. Does the bar moving bar appear no matter what the input is (tv, dvd player, game system, etc). If sop, then it is almost definately the coax cable.

Disconnect it and see if the bar from other sources disappears. If it is, then you need to ground the coax before it enters the cable box. Many surge protectors have coax grounding capability, so just pass it through that. Alternatively, hook the tv up to the cable box via hdmi, which would also elimitate the scrolling bars.
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Old 10-06-2008, 10:04 PM   #7
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Still sounds like a ground loop issue. Even though all your devices are grounded together, it's possible that it's the coax cable is what is giving you trouble. I would think that the cable box would ground it, but perhaps not. Does the bar moving bar appear no matter what the input is (tv, dvd player, game system, etc). If sop, then it is almost definately the coax cable.

Disconnect it and see if the bar from other sources disappears. If it is, then you need to ground the coax before it enters the cable box. Many surge protectors have coax grounding capability, so just pass it through that. Alternatively, hook the tv up to the cable box via hdmi, which would also elimitate the scrolling bars.
A good point about it possibly being the 75ohm cable from the cable coming into the house. I have heard that many cable systems didn't properly ground the cable coming into the house so removing the connection to the display AND unplugging the cable box could show that this is the cause.

If so, the solution is to have the cable company fix the issue.
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Old 10-06-2008, 10:12 PM   #8
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I had the same problem with my component cables coming from my cable box. It was only on the sd channels. Turned out to be the component output on the box. Charter brought a new box and the line went away. Changing the cables worked for a while for me at 1st , but the line came back until I had the box switched out.
L2W and PFC5, This is what the cable tech told me. Could it have been the original installation was done wrong?
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Old 10-06-2008, 10:29 PM   #9
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Did they just replace the cable box and not any cables? If so it is unlikely that the install was done wrong and it was just a faulty box. If they replaced the cables also, then it could have been either was the cause.
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Klipsch RP-5 Pwred Towers (mains) (525 watts peak each 12"Subs)
All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
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For SACD/DVD-A Samsung HD-841
Panny 50pz80u plasma
SETTINGS
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SA 3250HD
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Harmony 680 + (2) 670s (amazing remote/support)
Game room with Onkyo receiver & B&W Speakers
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Old 10-06-2008, 10:31 PM   #10
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Quote:
Originally Posted by PFC5 View Post
Did they just replace the cable box and not any cables? If so it is unlikely that the install was done wrong and it was just a faulty box. If they replaced the cables also, then it could have been either was the cause.
Sorry. The Box and Component cables were replaced.
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Old 10-07-2008, 01:56 AM   #11
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Quote:
Originally Posted by mytime View Post
Sorry. The Box and Component cables were replaced.
So they didn't replace the cable coming into the box? If they did not, then it was just a faulty STB most likely.
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All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
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Old 10-07-2008, 10:15 AM   #12
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Quote:
Originally Posted by CaddyMatt View Post
Hey all, I recently purchased a 32" Viewsonic LCD HDTV. The TV displays great HD cable content from the HD channels, however I have a very faint "line" or "bar" moving up the screen very slowly towards the top, and it loops around and starts back from the bottom. The cable box is hooked up to the TV with component cables. Is there some setting I missed or do I need to calibrate the TV or something? Thanks!
Make sure all power cables, coax, video cables are not touching each other. Also try placing the set away from any power transformers that are nearby but on the other side of the house. Some sets pick these up more than others. Also Check the coax cables see if the copper is not shiny you can use a knife to make it shine again.

But you might have a bad connection some where or the set has a faulty PBC.
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Old 10-07-2008, 03:22 PM   #13
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Are you sure that it is a Surge Protector and not just a 6 outlet power strip? (there is a difference). What I would reccommend would be a Monster Surge protector for AV hardware, not only is it a real surge protector, but it also has an input for Coax cable and that effectively "normalizes" the signal coming through the Coax Cable taking out the peaks and dips in the signal wavelength and it SHOULD get rid of your travelling bar (it did in my case, and even gave me better reception on my panel).
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Old 10-07-2008, 07:25 PM   #14
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Monster surge protectors are overpriced for what they do just like all their products. It reminds me of BOSE with their pricing and how they overcharge and have been sold as a premier product that deserves a premium price.

Cyberpower makes excellent surge protectors and they sell for less than half the money with higher joule count AND the same signal filtering.
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Klipsch RP-5 Pwred Towers (mains) (525 watts peak each 12"Subs)
All Klipsch RC-25(ctr),(2)SS1(surr),(2)SS1(rearSurr)
Toshiba (2)HD-A20,PS3,BD35
For SACD/DVD-A Samsung HD-841
Panny 50pz80u plasma
SETTINGS
RCA HD50LPW162 50"DLP w/HD2+
SA 3250HD
47" LCD+Yamaha5790+HD-A1(bedroom)
Harmony 680 + (2) 670s (amazing remote/support)
Game room with Onkyo receiver & B&W Speakers
The_Cable_Game
Take the high ground and be happier
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Old 10-07-2008, 09:53 PM   #15
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Quote:
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Monster surge protectors are overpriced for what they do just like all their products. It reminds me of BOSE with their pricing and how they overcharge and have been sold as a premier product that deserves a premium price.

Cyberpower makes excellent surge protectors and they sell for less than half the money with higher joule count AND the same signal filtering.
Woods and Belkin do also and they don't cost and arm or leg. Once these go bad just replacement. I usually buy things devices on clearance red tag. I don't feel like spending so much money socket extender with surge/ground protection.
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