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On our Sharp LCD this happened when the picture format was changed. We have a stretch function which caused this issue. If you go into your TV menu you may have the same type of settings depending on your TV. It happened to us mostly during commercials when the signal changed. We simply adjusted the screen sizing and it went away.
It is due to the higher video level from your set top box. It may have a higher video level than the tv can accept. Try to reduce the level by capacitor resistor[R-C] network in series with video input cable.
Set the screen format using your TV's menu. Do not set the format of the screen using your provider's receiver. I had this prob with a few channels with a dish provider when I set the format with the remote from the dish provider. I picked up the TV's remote, went into the menu, set the format, problem fixed.
This is a frame collapse. If it sorts itself & then goes like this intermittantly then you will have a poor soldered connection either on the frame IC or surrounding components. If the white line is permanent then most likely the frame IC has failed & would need replaced.
Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.
A white like across the screen means that the vertical circuit has stopped working. Look for a small fuse that looks like a resistor near the vertical output IC, replace that fuse if open and resolder the pins on the vertical output IC.