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    #1

    Sharp E50E41NKFMBXNNX white screen

    I'm trying to fix this TV that I got from a friend. It displays a white screen only. What is weird though is that when I first turned it on it appeared to work for a few minutes but then got the white screen and I haven't got the picture back even for a second after that initial time. If I plug in an HDMI device, the audio is played through the TV speakers, and the power button turns the TV on and off.
    I've tested the caps on the power supply with an ESR meter while in circuit they seemed within spec.
    Tried wiggling the LVDS while on and no change to the white screen. Have removed the two cables going to the panel from Tcon one at a time, still white screen.
    I've done quite a bit of reading and I suspect the Tcon but I'm not 100% sure. Here's the information I have.

    Tcon:
    F01 fuse 12v
    avdd 15.6v
    vcom 6.4v
    vgs -6
    vref 15.3
    vgh 30v
    Found 3.3v and 1.8v on RT9183.
    VGM 17 to 1 are all there in descending order
    Attached Files
    Tags: None
    #2
    Re: Sharp E50E41NKFMBXNNX white screen

    You seem to have voltages. I would check if I had signal coming into the t-con on the pads with the dual lines at center of connector. Should be about 1.2v.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

      #3
      Re: Sharp E50E41NKFMBXNNX white screen

      Thanks for that idea, (pasted the results below) those voltages appear too low or inconsistent right? Based on those readings I went back to the logic board and got the same readings from the test points by the lvds connector. I desoldered the metal shield over the processor to get a better look at it. (2nd time I've gotten to use my hot air station!). I have the service manual so took a look at the pinout on the MSD8220LB-S9. Grasping at straws but figured I should at least check that it's getting power. I found 4 "vddc" lines on the schematic and verified that they all have voltage which is 1.16v (not sure if that is the voltage it should have though). It does have a good ground as well.
      At this point perhaps the processor has failed? It's weird that it's decoding hdmi audio though.


      1st block pins left to right then top to bottom
      1.45v
      1.5v
      0
      10mv
      .2v
      .2v

      2nd block
      .78v
      10mv
      1.9v
      1.56v
      0
      .39v

      3rd block
      2.1v
      11mv
      2v
      .3v
      0v
      .3v

      4th block
      1.4v
      10mv
      2.1v
      1.45v
      0v
      .23v

      5th block
      .79v
      10mv
      1.94v
      1.54v
      0v
      .4v

      6th block
      2.1v
      10mv
      2v
      .3v
      0
      .3v

      Comment

        #4
        Re: Sharp E50E41NKFMBXNNX white screen

        These are probably ok if you are reading across top ans then across bottom. My first guess would be t-con. I have a tv with basically same problem. I found data went into chip on t-con but wasn't coming out. I verified with my mainboard tester which showed a picture.
        I assume no responsibility for any stupid suggestions I might post.

        Comment

          #5
          Re: Sharp E50E41NKFMBXNNX white screen

          That mainboard tester sounds like a sweet tool, can you tell us more about it? thanks.

          Comment

            #6
            Re: Sharp E50E41NKFMBXNNX white screen

            This is older version. https://www.aliexpress.com/item/1005...7e7e4c4dfTVkk7
            Won't test 2K etc. but is about 1/4 price of new version.
            I assume no responsibility for any stupid suggestions I might post.

            Comment

              #7
              Re: Sharp E50E41NKFMBXNNX white screen

              That is a cool tool, thanks Dskall.

              Comment

                #8
                Re: Sharp E50E41NKFMBXNNX white screen

                Very cool tool. I managed to find the tcon and mainboard for cheap on ebay so I bought them both, I'll update and let you know what the issue turned out to be once I get them. Thank you for the help!

                Comment

                  #9
                  Re: Sharp E50E41NKFMBXNNX white screen

                  Just an update - The tcon was the issue, replacing it fixed the tv. thanks for all your help

                  Comment

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