Horizontal lines across the top 3 inches of picture
My television, purchased about two years ago has recently developed white lines (sometimes colored) that run along the top three inches of the picture. They can distort words that appear at the top of the screen, but usually don't interfere with picture. What is causing this? Is it repairable?
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This is probably bad/leaky capacitors in the vertical circuit, around the vertical IC, or the power supply that feeds the vertical. Sometimes you can see domed/ bulged caps or what looks like liquid on the circuit board around the leaky ones. The legs on some caps can even corrode to the point the leg is missing. Care must be taken when replacing them because the acid from the caps can eat away foil traces on the circuit board. All acid must be cleaned off board to prevent further corrosion of parts
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.
If the horizontal lines going through the picture are fine white lines, then I would suspect the picture tube as having a heater to cathode short or some other problem. Since some sets have had a 3 year warranty on the picture tube, you may be lucky unless the labor to replace the tube is more than the set is worth. Sanyo is usually not a good name in consumer electronics anymore, so if you're looking for a replacement I would look elsewhere.
It sounds like a vertical deflection problem. You mentioned you had a white HORIZONTAL LINE in the middle of the screen. If this line runs from left to right across the screen it's in Verticla deflection. If it runs from top to bottom, it's in Horizontal deflection. I am assuming the problem is a Vertical deflaecion problem. The repairs necessary are most likley to replace the vertical capacitors or the verticla deflection chip.
NC Electronic Mills, Wyo USA
Those lines sound like "retrace lines" and several things can cause them. The most common are shorts inside the picture tube and shorted semiconductors in the video driver circuits. They can also be seen if the blue screen voltage is too high or if someone has tampered with the screen voltage control.
Your whole problem my freind is dryed up capacitors. You should go, if you have the technical ability to replace these capacitors, to http://servicemanuals.net, download the schematic diagram, and start replacing the waveshaper capacitors in the vertical drive circuit.