Question about Sanyo DP46848 LCD TV

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Cold power up, colored vert lines, (rainbow) audio perfect. When warms up, pix returns, slight black horizontal lines in top forth of screen which go away when warmer.

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Hi,

All Plasma and LCD ts have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them, Good luck in rectifying the problem.....

Posted on May 17, 2011

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