Sanyo DP50749 50inch plasma tv picture issues

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • gillisfire
    Member
    • Nov 2013
    • 16
    • USA

    #1

    Sanyo DP50749 50inch plasma tv picture issues

    I have had this tv for about 3 yrs now. The picture started acting up and going dark. I found that if I put a fan (and eventually an a/c duct) blowing up towards the main board, the tv would work with no issues. So because of this I thought the main board was going bad. I eventually got lucky and found the correct board on line and replaced it.

    Well it turns out the main board wasn't the problem. The tv still works ok for a little bit, but eventually the picture starts getting dark again. So now I am back to square one. What is the next thing I should look for that may cause the picture to go dark. I am open to any suggestions since I am a newbie at this.
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: Sanyo DP50749 50inch plasma tv picture issues

    probably need a little more info and a picture of the display when it's normal and one when it dims.

    Looks like this model could be panasonic,LG or Samsung based which may also help in working out what's wrong especially if it's a common issue based on the panel it may have.

    If I was to have a guess, I'm expecting it won't be a panasonic panel and maybe Samsung?

    A bad Xmain if Samsung or Zsus if LG could cause a dim picture. Some voltage checks may give a clue but really need to know what the boards are that in it to maybe find another model's service manual to get some specs.

    I know some of the panasonic stuff, not real knowledgable on the LG/Samsung but good chance someone else has experienced a similar issue.

    A photo of the layout of the boards may be handy for everyone too.

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia

      #3
      Re: Sanyo DP50749 50inch plasma tv picture issues

      Is this the same Tv that you first posted back in november with the samsung parts?

      https://www.badcaps.net/forum/showth...hlight=dp50749

      If so, you'd be better off adding to that post so all the previous history can be read plus there's photos already uploaded for that one.

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: Sanyo DP50749 50inch plasma tv picture issues

        You could try disconnecting the Vs cable from the Xmain and if the display is the same as when it has these dim issues, that may give a clue it could be Xmain related. I don't know if this will cause a shutdown but might be worth a shot for isolating the cause.

        Comment

        • gillisfire
          Member
          • Nov 2013
          • 16
          • USA

          #5
          Re: Sanyo DP50749 50inch plasma tv picture issues

          Tw2005, sorry that was my thread with the Samsung based unit. I thought posting a newer thread would be better but I went ahead and updated the older one. When I get a chance this weekend I will try and disconnect the Xmain and post some updated pictures.

          Comment

          Related Topics

          Collapse

          • JJAAMM
            SAMSUNG UN55KS9000F picture fades then distorts into vertical lines after 20 seconds
            by JJAAMM
            This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.

            Problem
            TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode...
            07-06-2023, 06:01 AM
          • homerging
            Sony trinitron Wega KV-HR36 picture issues
            by homerging
            Hello,
            could anyone please tell me what is likely to be causing the CRT picture quality issues as shown in the attachments and what it'd take to fix it if that is possible?

            The picture has a greenish tinge, colour scan lines are separated and there can be shimmering and the bottom can be missing at first. It has slowly gotten worse over time.

            It is worst when first turned on and slowly improves but not resolves over a period of approximately 90 minutes. Warmer room temperatures possibly have a positive influence....
            08-05-2022, 07:06 AM
          • TR103
            Samsung TV model UE50TU: rebooting, backlight, sound, but no picture
            by TR103
            Hi, I have a Samsung UE50TU with:
            - sound and backlight, but no picture
            - when it arrived, it had a picture for a few seconds
            - it keeps rebooting
            - without ribbon cable between the two panel boards, it does not reboot but I have no picture
            - without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
            - when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.

            - without cable between mainboard and lcd panel and with a jumpered...
            01-22-2025, 04:12 PM
          • Mgiffune
            Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
            by Mgiffune
            I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

            I ordered a supposedly ‘new' Tcon board this time, and
            ...
            06-09-2024, 10:28 AM
          • CyberPhoenix
            Issue with picture quality of Sony bravia TV
            by CyberPhoenix
            Hello, Last week I bought the 50" Sony X80j tv everything was working fine, untill I plugged the tv in a ups power supply 650va the tv remote control became unresponsive and the TV became laggy after a while the picture quality isn't the same as before the tv seems less brighter and the picture is somehow blurry, people's faces don't look as natural as before, there is a mini orange-pink tint to the edge of people's faces especially in NETFLIX Dolby Vision like in One Piece ep1 Alvida skin tone, my intention was to protect the tv but something went wrong I checked the ups with a multimeter,...
            01-22-2024, 02:08 AM
          • Loading...
          • No more items.
          Working...