Black horizontal lines across bottom 1/3 of screen
Model is 27GT271. Shows a band of distortion (scan lines spaced out) about 2" high at about 5/8 down screen, then picture is normal until about 4" from the bottom where distortion re-occurs all the way to the bottom.
Occasional, picture snaps back to normal for a brief period. But always eventually reverts to distortion pattern mentioned above.
This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.
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Based on the symptoms you described, it sounds like there could be an issue with the LCD panel or the T-Con board in your TV. The horizontal lines and distortion may be caused by a faulty connection between the LCD panel and the T-Con board, or it could be a problem with the T-Con board itself.
You may want to try some troubleshooting steps to see if you can resolve the issue before contacting a technician. First, check that all of the cables connecting your TV to your devices are securely plugged in. If the issue persists, try resetting the TV to its factory settings. If that still doesn't fix the problem, it's likely that there is a hardware issue and you may need to contact a technician for repair or replacement of the faulty component.
Not good. You may have a tab failure. A repair shop may be able to diagnose and repair this, but most likely the lcd panel is broken. The panel is the most expensive part of flat tv's. A new panel will cost more than a used tv.
This is either 1 of 2 things, first it could be faulty panel tabs , in this case, there is nothing you can do and is unrepairable....2) you could take the back off the tv and you will see 2 ribbons going from your t-con board to the panel tabs (top center of tv) remove them carefully and reseat them. This is a common problem. Tv repair tech 15 years! Best of luck.
If what you are trying to say is that you have a 1/4 inch horizontal line across your screen, this means that something in your vertical deflection circuit has failed. This could be the vertical oscillator, the vertical output processor, the vertical coupling capacitor, or the vertical section of the yoke transformer.
If what you are talking about is a vertical line from top to bottom then you are possibly talking about a failed horizontal section of the yoke transformer.
Why so little about the horizontal section of the yoke? That is because if the horizontal section fails completely then you would lose high voltage and no line would be present because you would not have raster (screen light).
In any even check the yoke transformer first. Then work back from there.