5v standby flickering

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  • Trofazni
    Senior Member
    • Dec 2016
    • 71
    • Serbia
    #1

    5v standby flickering

    Hello, this is my first thread. I have a bad power supply on grunding lcd tv 32LXW 82-8729, psu is Beko LCD PSU-3. I found schematics, i will attach it. I recorded video of a problem on youtube and you have visual of problem. Everything i checked so far is ok.
    On video, first measurement is on hot side, power supply for IC 1002, it is not steady, as you can see. Second measurement is on secondary side, 5vstb rail. TR1002 is buzzing, trying to start, but it has problem holding 5v.. Caps are ok, esr measured, some replaced, still problem persists.
    Can you give me directions of what might be a problem?

    From 1:16 on video, you can see it flickering.. Mobile camera is unable to capture it clearly, but its flickering all the time...
    https://www.youtube.com/watch?v=gGNGFuqYdpM
    Attached Files
    Last edited by Trofazni; 04-08-2017, 06:25 AM. Reason: youtube link
    Tags: None
    • cpt.charlie
      Badcaps Veteran
      • Sep 2013
      • 270
      • Spain
      #2
      Re: 5v standby flickering

      Check the cap that filters the power for the PWM chip.

        Comment

        • Trofazni
          Senior Member
          • Dec 2016
          • 71
          • Serbia
          #3
          Re: 5v standby flickering

          All caps have beeen checked with esr meter...

            Comment

            • cpt.charlie
              Badcaps Veteran
              • Sep 2013
              • 270
              • Spain
              #4
              Re: 5v standby flickering

              Do you have the proper readings at IC1002 as shown in the schematic?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: 5v standby flickering

                  I know you check the ESR of the caps but the capacitance of C1015, C1058 are OK?
                  Same thing for the output filter caps.
                  D1007 good?
                  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

                    • jazzie366
                      Badcaps Veteran
                      • May 2016
                      • 304
                      • United States
                      #6
                      Re: 5v standby flickering

                      Originally posted by Trofazni
                      Hello, this is my first thread. I have a bad power supply on grunding lcd tv 32LXW 82-8729, psu is Beko LCD PSU-3. I found schematics, i will attach it. I recorded video of a problem on youtube and you have visual of problem. Everything i checked so far is ok.
                      On video, first measurement is on hot side, power supply for IC 1002, it is not steady, as you can see. Second measurement is on secondary side, 5vstb rail. TR1002 is buzzing, trying to start, but it has problem holding 5v.. Caps are ok, esr measured, some replaced, still problem persists.
                      Can you give me directions of what might be a problem?

                      From 1:16 on video, you can see it flickering.. Mobile camera is unable to capture it clearly, but its flickering all the time...
                      https://www.youtube.com/watch?v=gGNGFuqYdpM
                      I see shit caps on that board that should be replaced whether or not they're bad. I'd do that and then check everything. If it's still making a buzzing noise, then more troubleshooting is necessary.
                      Popcorn.

                        Comment

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