Question about Vizio VW42LF 42 in. LCD HDTV

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2/3 Inch Faint Horizontal Bar through center of screen

The last couple of days I've notice a faint black horizontal bar through the middle of the screen of my television. You can see it better when the screen is bright. It very noticeable when the television has a full blue screen when I'm changing to one of the component screens. Any ideas of what this is? The TV is still under the extended warranty through walmart and I wonder if it will need serviced or someone knows of a quick fix to the issue. Thanks!

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A little WARNING!! .. don't open the TV because if you do that the warranty is gone.

Whenever you see a black horizontal bar on the flat panel screen TV, it usually means that the buffers in one of the Horizontal COF chips is dead, not soldered properly or got damaged mechanically during transport or something like that. COF chips are microchips made on the flat cable that are connected from the board to the LCD panel screen, and they lit up certain sectors of the screen. Every X buffer lits up pixels from specific locations in combination with Y buffers, depending on type of panel used in a device. and when one of the Y buffers die ... then the pixels receive only X buffers information and not Y and then the black bar appears with some weird noise dots on the edges or something like that. It is repairable, what you need is an SMD repair (rework) soldering station and an identical Buffer COF chip. Unfortunately this is not a quick fix if you don't have the appropriate equipment, so I would suggest using that extended warranty and get your TV serviced properly by the LCD repair man :)

http://www.epartshub.com/upload/cmpy/00000166/Img/00000166-COF.jpg

...this is the COF chip.

http://www.hotsolder.com/uploaded_images/iron-726250.jpg

... this is the hot air SMD soldering station

depending on the COF chip type, some of the chips are soldered and some are just connected through the flat connectors without soldering.

A little WARNING!! again .. don't open the TV because if you do that the warranty is gone.

Posted on May 11, 2010

  • John_in_Roch Aug 01, 2011

    Absolutely the BEST, most Definitive, answer across the entire internet concerning this specific LCD display issue. This man knows what he's talking about. . . no question!!!

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