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Samsung LN46A850 - Displays image that degrades, then reboots

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    Samsung LN46A850 - Displays image that degrades, then reboots

    Samsung LN46A850. Purchased new like 150 years ago.

    This unit recently started doing this.

    Power the TV on, it powers up and displays picture. Picture will display fine for about 5-10 mins, then the image degrades with static-like horizontal lines until the set turns off, then the set will turn back on and the process repeats. When the horizontal static lines appear, they push and stretch the remaining image below the static off of the viewable portion of the screen.

    While this feels like potential bad caps, I don't have a clue where to focus my efforts. Would a PSU fault cause this, or should I be focusing on the mainboard /TCON timing components?

    I took a video, and am currently in the process of taking the TV off the wall. I'll post some pictures of the boards as soon as that gets done.

    Here's the video of a particularly bad episode:
    https://youtu.be/Zt-sK__flIk

    #2
    Re: Samsung LN46A850 - Displays image that degrades, then reboots

    Pics attached.
    Attached Files

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      #3
      Re: Samsung LN46A850 - Displays image that degrades, then reboots

      don't know what you have tried but easy stuff first, try another hdmi port, try another hdmi cable, does it do the same on antenna or rca inputs?

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        #4
        Re: Samsung LN46A850 - Displays image that degrades, then reboots

        some testing there, see if your expected voltages are there and steady, not fluctuating: https://www.youtube.com/watch?v=ocqnqmBxiqY

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          #5
          Re: Samsung LN46A850 - Displays image that degrades, then reboots

          It's definitely not input related, as the same thing happens in the TV settings menu.

          I was expecting to see some bulged caps, but everything appears visually normal, apart from some light heat discoloration. I checked the 2 fans as well and they still spin freely after 10+ years!

          I'll check those voltages in the morning and report back.

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            #6
            Re: Samsung LN46A850 - Displays image that degrades, then reboots

            Possibly bad C102 on main board. https://www.badcaps.net/forum/showthread.php?t=45913

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