If you have parallel horizontal black lines on a white background, you can see the separation between the lines when it is viewed at close range (Figure 1). As you view the lines from further and further away,the image gets smaller, you eventually get to the point where you can no longer see the separation between the lines, and it looks like one line. Losing the ability to see separation in the lines is exactly what happens when you sit too far back from an HDTV set. If we apply the same principle to an HDTV, a 1080p resolution HDTV has to fit 1920 vertical and 1080 and horizontal black lines separated by the white space on the screen, (that is the pixel grid of a 1080p HDTV display). Furthermore the spaces between each cell of the grid need to be very small in relation to the area each cell occupies, or you will get a screen door type effect. A bigger HDTV can increase the size of the cells and the separation between the cells, so everything doesn't run together when you sit further back.
Performance chip
SOURCE: phillips plasma tv MDL 42PF9966 Black Line across screen
The ribbon cable to the drive has either came loose of the drive itself went bad. You can open up the back if you are confident and see if adjusting the cable gets the line back. If not you will need to replace the Upper Y Drive.
Thanks
Josh
SOURCE: screen blacks out on HD channels
Saying that the problem is with your TV doesn't make any sense since your TV is fed from the cable box. Your TV doesn't know one channel from the next. If it had a problem it would effect all channels. You may not have enough signal to the INPUT of your cable box due to a problem on the pole or at your house or both. Insufficient signal can cause some digital channels to not get decoded properly by the cable box. The lower channels will show noise symptoms such as what you describe but they won't crap out altogether like the digital ones. Have a cable tech come out and measure the signals. Do you have splitters in line with the cable anywhere? If there's any way to beef up the amount of signal getting to the cable box try it.
SOURCE: Phillips 42in plasma lines ocross screen
Are the solid horizontal black lines or colored lines. If colored lines there is a posibility that your Y-main, and upper and lower Y-buffers are bad. If black you have a bad plasma panel.
SOURCE: Hitachi 50" hd TV displaying black lines on screen
Sounds like your YBL-Y Buffer lower board is going out. There are 3 boards here. The Y buffer upper which controls the top half of the display, The Y buffer lower controls the bottom half and the Y-SUS main control those two boards. They work in unison. Usually if one goes out you have to replace all. You can also get lucky and just repalce the YBL and all may be well. Now if they are vertical lines up and down the OSD-On screen display, then this is indicitive on dry solder joints on the D, G E, F boards. Hope this helps...
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