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Sanyo DP42848 with almost completly white picture

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    Sanyo DP42848 with almost completly white picture

    Im working on a sanyo dp42848 which you can make out whats on the screen but theres no color / low contrast. As far as i know this is a tcon error, so im probably gonna pick one up from a badcap member who's tv was incapacitated during a backlight repair. (Plan to sell the set right after its working, cause looks like these sanyos fail all the time from backlight issues)

    I wanted to check Budm's guide to tcon faults first before buying it, but i cant find it from searching here, maybe hes one of those people who call them LCD controllers

    Checked all the PSU voltages and theyre great, doesnt shut off (so no backlight issues), and checked for 12v at test point on TCON and i get it. Problem affects all inputs and menus.

    I have a feeling when tcons do this type of fault, its due to them no longer producing sufficient voltage to fully turn on the pixels, but i suppose the problem could be related to something in the panel / but it seems logically that a disconected connection would leave some areas not functioning at all (sort of similar to sonys with bad tab bonding only having half some of the screen too bright / slow to change), and not produce a even affect over the whole screen.
    Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

    #2
    Re: Sanyo DP42848 with almost completly white picture

    https://www.badcaps.net/forum/showthread.php?t=25810
    post 12. Sound like failed voltage for Gamma.
    Last edited by budm; 02-14-2013, 10:51 PM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment


      #3
      Re: Sanyo DP42848 with almost completly white picture

      Direct link to post:
      https://www.badcaps.net/forum/showpo...4&postcount=12
      I actually found it a second before you replied

      This type of failure isnt listed, how often do you run into the almost no contrast issue in your repairs? and is it usually the tcon?

      A picture is attached below of the set while on. Obviously have tried a factory reset, and adjusting all picture settings.
      Attached Files
      Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

      Comment


        #4
        Re: Sanyo DP42848 with almost completly white picture

        That does look like the lost or low voltage for turning off the LCD, that voltage is geneared by the IC on the T-CON board..
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment


          #5
          Re: Sanyo DP42848 with almost completly white picture

          I tested the 1 large regulator on the tcon, and it had a little over 1 volt on the tab , and no voltage on the lower / outer 2 pins. Which seemed odd, but i dont have my diode testing multimeter at home so didnt test it further. Not sure if that is used to drive the chips vcc on the tcon, or what.

          Are all the other voltages created within the main chip on a tcon?
          Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

          Comment


            #6
            Re: Sanyo DP42848 with almost completly white picture

            You may want to read this and see if your T-CON has this IC AS15G (EC5575).
            https://www.badcaps.net/forum/showth...mma#post304275
            Attached Files
            Last edited by budm; 02-14-2013, 11:35 PM.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment


              #7
              Re: Sanyo DP42848 with almost completly white picture

              Mine has AS15-F, clearly no relation

              Looks like ill go ahead and get that tcon for $30, even if that chip was 10 cents, im not waisting my time / or limited patience soldering a 48 pin IC with a 3mm bevel iron
              Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

              Comment


                #8
                Re: Sanyo DP42848 with almost completly white picture

                You got it. It looks like bad news if a lot of T-con boards use this AS-15 IC (EC5575).
                Last edited by budm; 02-14-2013, 11:32 PM.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment


                  #9
                  Re: Sanyo DP42848 with almost completly white picture

                  I got the new t-con, popped it in, and has worked flawlessly for the last 6 hours. Time to sell it. 42 inchers move like hotcakes on craigslist.
                  Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                  Comment

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