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Bizarre HD TV problem

post #1 of 3
10/20/10 at 1:39am
Thread Starter 
I upgraded to HD TV 9 months ago. All going fine until about 2 weeks ago when I noticed that vertical white lines & dots appeared on every HD program. The picture underneath is fine, but on top of it there are these white lines & dots. I've tried turning it off, unplugging etc. I have not tried changing the HDMI cable though, and I don't have a component.

It does NOT affect non-HD programs. They all work perfectly. ONLY HD. I've got a Philips LCD TV.

Any ideas? I read somewhere electrical interference could be the problem.

thanks.
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post #2 of 3
10/20/10 at 3:40am
Try everything to make sure it isn't the TV, if you can borrow these from a friend or something: try a different HDMI cable, feed it component, maybe try another cable box or BD player.

If it is indeed the TV you'll probably need to use your manufacturer warranty, I'm not familiar with what Philips is but I'm guessing around 1 year.
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post #3 of 3
10/20/10 at 4:36pm
EDIT: Just noticed you said *vertical* lines. That might be something different from what's described below.

From here: http://www.highdefforum.com/directv-...cd-screen.html

Quote:
What you are seeing is the data for the closed captioning, which is sent in the interscan between TV frames. As other posters have said, this usually indicates you have an overscan/position setting problem on the TV.
Just about all TVs have the ability to adjust the horizontal and vertical center, height and width, although for many TVs these adjustments are in the service menu which you usually can't access without a special key sequence/code. Once you have access, you can use a test pattern to get the positioning and overscan correct. "Overscan" is the amount of the TV picture you lose because the height/width of the picture is adjusted to be slightly too large for the screen. It is possible to have zero overscan, but this usually results in seeing noise including the closed caption data on some channels. The usually recommended overscan setting for a modern flat panel TV is around 4%. Test patterns such as those on the Avia and Video Essentials DVDs, and the one broadcast by HDNet, allow you to check the TV geometry and set the overscan correctly.
If you can't get access to the service menu, or don't want to run the risk of completely screwing up your TV (using the service menu is not recommended for those who do not know what they are doing) you will need a service call for your TV.
I wouldn't recommend the service menu. Just play with different screen settings on your TV (Native/Full/Wide/Etc.) until it goes away, or live with it. There's nothing "wrong" with your TV per se.
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