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Flashing white lines top of screen - correctable?

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Old 06-28-2007, 08:34 AM   #1
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Default Flashing white lines top of screen - correctable?

I've searched many AV/DTV forums trying to discover if these lines are a common condition, the correct terminology of the problem, or a correction/calibration solution.

These lines occur on both my Sony 50" and Phillips 42" plasma HDTVs on a few digital non-hd channels. I have cable service with Cox.

The symptoms are consistent on both sets on the same channels, so I suspect maybe a calibration of the HD receiver may be in order and not an adjustment on my HDTVs.

The STB is a SA 8300HD. Cox techs are clueless.

Thanks for any feedback.

Tom
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Old 06-28-2007, 09:08 AM   #2
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Originally Posted by t_hart View Post
I've searched many AV/DTV forums trying to discover if these lines are a common condition, the correct terminology of the problem, or a correction/calibration solution.

These lines occur on both my Sony 50" and Phillips 42" plasma HDTVs on a few digital non-hd channels. I have cable service with Cox.

The symptoms are consistent on both sets on the same channels, so I suspect maybe a calibration of the HD receiver may be in order and not an adjustment on my HDTVs.

The STB is a SA 8300HD. Cox techs are clueless.

Thanks for any feedback.

Tom
Hi and welcome to HDF

What you are seeing are the housekeeping lines on the programming (you are not supposed to see these) - they don't have the overscan set properly. Did you adjust your overscan to 0%?

http://en.wikipedia.org/wiki/Overscan
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Old 06-28-2007, 09:50 AM   #3
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Thank you, Lee.

Should I seek to calibrate the HD box or my HDTVs for overscan?

TIA
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Old 06-28-2007, 10:04 AM   #4
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Thank you, Lee.

Should I seek to calibrate the HD box or my HDTVs for overscan?

TIA
No can do on the box and if it only happens on certain channels but not others - it is their fault (cable co.) for not adding enough overscan to the signal before it is sent to you.

If your HDTV has an adjustment for Overscan I would set it at 3%.

If this adjustment is not readily available to you then there is nothing you can do.
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Old 06-28-2007, 10:34 AM   #5
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On my LCD panel there is an overscan fix button that when pressed it will add what looks like about 5% overscan. The problem with it, as would be for all fixed pixel displays, the overscan is accomplished by a scaling of 1.05 (for 5%) which make the picture not quite as clear. On mine the noise only happens on a few channels and even then not all the time, so I just ignore the noise in favor of a better picture.

Last night, for example, I was watching Jay and on the left side of the screen was this green stripe. The overscan fixed it, but the picture was fuzzier, so again I put up with the green stripe. With the overscan turned off when network commercials came on the noise stripe at the top of the 4:3 commercials would be there, but when the local commercials and any HD commercials, the picture filled the screen with no noise.

Last edited by rbinck; 06-28-2007 at 10:38 AM.
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Old 06-28-2007, 11:35 AM   #6
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Quote:
Originally Posted by t_hart View Post
I've searched many AV/DTV forums trying to discover if these lines are a common condition, the correct terminology of the problem, or a correction/calibration solution.

These lines occur on both my Sony 50" and Phillips 42" plasma HDTVs on a few digital non-hd channels. I have cable service with Cox.

The symptoms are consistent on both sets on the same channels, so I suspect maybe a calibration of the HD receiver may be in order and not an adjustment on my HDTVs.

The STB is a SA 8300HD. Cox techs are clueless.

Thanks for any feedback.

Tom

Tom, it is a very common problem on SD digital channels when viewed in an aspect ratio other than 4:3. I usually just live with it -- but as suggested you can adjust the overscan-- or try changing the aspect ratio on the TV -- I have 3 HD TVs and none use the same name-- but, if you are trying to "fill the screen" with an SD signal -- change the aspect/view ie. Zoom, Full, 16:9, Justified, etc. to find one that gives a satisfactory (or at least "better") result. This usually get rid of the lines at the top.

A very slight adjustment to the tv's overscan may fix this forever-- but on many sets you need to enter the "service menu" (and you can do more harm than good, if you are not sure about what you are doing . . . as I said: "I just live with it . . " myself
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