Samsung UN55TU7000 no picture but have power, backlight, and sound

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  • Pwtzz
    Member
    • Nov 2021
    • 10
    • Usa
    #1

    Samsung UN55TU7000 no picture but have power, backlight, and sound

    Hi all,

    I obtained this Samsung UN55TU7000 and want to save to save from going to the dump. It has backlight when I turn on the TV, it stays lit, and when I click the menu on the remote the backlight blinks and has sound.
    I've search here and looked up pages after pages but I can't find the specific one. I'm only equipped with soldering iron and multimeter for now. I've found plenty of shorted caps in the right side panel (when looking in front of TV) itself since this Samsung has the T-con integrated. No short on the left side. The pattern of the shorted caps is as followed.

    C44,C43,161--C160,C46,C45--C159,C48,C47--C162,C50,C49--C52,C51,C163--and 2 unnamed caps circled. I've marked them all in the pics.

    I haven't tested any voltages as I'm not sure which one's to test. I don't know how to go about from here. Do you guys think this is still fixable? Please advise on how to go about. Thanks in advance.
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    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

      Did you find those shorted caps with the LVDS cable connected ?

        Comment

        • Pwtzz
          Member
          • Nov 2021
          • 10
          • Usa
          #3
          Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

          Originally posted by diif
          Did you find those shorted caps with the LVDS cable connected ?
          Short is there without the LVDS connected. LVDS only connects to the right panel then cable ribbon connects from right panel to left. There's no short caps on the left panel at all.

            Comment

            • Pwtzz
              Member
              • Nov 2021
              • 10
              • Usa
              #4
              Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

              More information from me. I just got around to checking the voltages in the shorted panel. I have no voltages on the dots (VGL,VSS,AVCM,TVCM). I looked up flash memory 25Q32JVSIQ Winbond and measured it as well. I didn't get any VCC voltage but I got 3volts from pin1 (chip select).
              Attached Files

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                • Pwtzz
                  Member
                  • Nov 2021
                  • 10
                  • Usa
                  #5
                  Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

                  Update: i found the short cap and replaced it with same size. No more short as tested but I still have no voltages (VGL,VSS). Any ideas?

                    Comment

                    • chopdre
                      New Member
                      • Jul 2012
                      • 8
                      • barbados
                      #6
                      Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

                      check the pico fuses on your main board, chances are the short blew one of them, located close to the power connection

                        Comment

                        • Pwtzz
                          Member
                          • Nov 2021
                          • 10
                          • Usa
                          #7
                          Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

                          Originally posted by chopdre
                          check the pico fuses on your main board, chances are the short blew one of them, located close to the power connection
                          Thanks you for the tip! I had to remove the heat shroud to locate this one hiding and this might be the culprit. I don't have the exact replacement for this one though. Any suggestions just for testing purposes?
                          Attached Files

                            Comment

                            • Pwtzz
                              Member
                              • Nov 2021
                              • 10
                              • Usa
                              #8
                              Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

                              Update: found a replacement and TV is now working well. Thanks for the tips!

                                Comment

                                • codycowgill
                                  Member
                                  • Aug 2015
                                  • 21
                                  • United States
                                  #9
                                  Re: Samsung UN55TU7000 no picture but have power, backlight, and sound

                                  Originally posted by Pwtzz
                                  Update: found a replacement and TV is now working well. Thanks for the tips!
                                  What cap did you end up replacing?

                                    Comment

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