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I just bought a used Samsung LCD TV , model : LNT4671F. When we bought it, the picture and everything was perfect and working fine. When I brought it home and turned it on, there was severe color distortion in the middle of the screen. After leaving it on for a while and/or tapping the back of the tv a couple times, the color distortion in the middle of the screen disappears and only the top right corner of the screen's colors become distorted. Eventually a single vertical black line appears on the right side of the screen and stays there. This pattern varies everytime we turn the tv on and off. We took it to a repair man who says that it is the "signal bulb" or "signal board" (he has a strong accent, i'm not sure which he said) . Any idea what the problem is and would I be able to purchase and install the replacement parts myself? He is asking $385 for parts and labor. Any help would be greatly appreciated!

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In the first placce buying a used LCD is not a good buy unless you have got additional warranty on the set since the change in the technology and spares are at a faster pace which might not give you value ffor money in case of a failure.
But not to worry I have few suggestions which you can look into only if you are familiar with electronics.
Check the main board after removing the rear panel for DRY SOLDERING which happens in most sets in a perriod of time due to constant heating and cooling of the solder joints. These joints are a major trouble and as you mentioned tapping brought back to life some complaints this is an area of doubt.
SO using a good soldering iron and ONLY if experienced attempt to solder the sections suspected of dry joints in the main board.please take care not to bridge connections to end up with a tampered set.
Look into the sections of the convergence IC, the powerr panel and drive panel, solder and correct.Since the set worked fine this can be the only reason.

Posted on Aug 30, 2010

  • Donald DCruz
    Donald DCruz Aug 30, 2010

    The last part , If the set worked at the place of purchase then why such a failure? So check this out and see .As I said repairing an old set is without guarantee.So before any more money is spend take another opinion and do the checks that I had reccommended.



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