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QN55Q60RAFXZA constant reboot

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    #1

    QN55Q60RAFXZA constant reboot

    I have a QLED, QN55QR60 it constantly reboot after a few seconds. The only thing I found abnormal is on the left panel driver. C005 SMD capacitor gets super hot to the touch when the TV boots. I did a Diode and continuity test. It showed up fine on my Fluke 115. Can anyone explain why it's hot? When the TV goes off, it cools down.
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    #2
    Re: QN55Q60RAFXZA constant reboot

    1)Issue resolved. I removed the capacitor C005
    2)Then C006 got hot.
    3)I removed C006, then felt D001 was burning up.
    4) I turned off the TV, add back C005 and C006 then removed D001.
    5) The TV is working now.
    I'm not entirely sure if it is fine for my client to use the TV without D001. I know LG models when the capacitor shorts. I remove the SMD cap and it resolves the issue. So far I haven't heard an LG client calling me back that their panel failed again. But I am unsure about the QLED.

    *EDIT* Do not remove any of parts while the TV is on.
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      #3
      Re: QN55Q60RAFXZA constant reboot

      Can you test C005/6? I'm in doubt they're in short but disconncted after disconnection of shorted diodes. Anyway it is highly suggested that you replace diodes because them are surely there for a purpose, and that would be spike reduction.. The next surge will destroy gate drivers so tv in the bin..

      try search uClamp6514P (UCLAMP6514P.TNT) or maybe alternative uClamp4014P (UCLAMP4014P.TNT) by Semtech
      --
      Last edited by Davi.p; 09-09-2021, 05:01 AM.

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        #4
        Re: QN55Q60RAFXZA constant reboot

        Originally posted by Davi.p View Post
        Can you test C005/6? I'm in doubt they're in short but disconncted after disconnection of shorted diodes. Anyway it is highly suggested that you replace diodes because them are surely there for a purpose, and that would be spike reduction.. The next surge will destroy gate drivers so tv in the bin..

        try search uClamp6514P (UCLAMP6514P.TNT) or maybe alternative uClamp4014P (UCLAMP4014P.TNT) by Semtech
        --
        https://cdn.badcaps-static.com/pdfs/...6e3d0cfe12.pdf Thank you very much!

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          #5
          Re: QN55Q60RAFXZA constant reboot

          There's a complexity to replacing that part especially it is close to the COF. Have you attempted to replace that diode with a soldering tip? I do have a 45 degree pointed tip. My concern is soldering the diode that's facing the SMD capacitors. It is not gonna be a walk in the park.

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            #6
            Re: QN55Q60RAFXZA constant reboot

            I have never had in hand this type of model with this fault but i think that a soldering stylus with 0,5mm tip is enough to do the job, no hot air, it's dangerous, or it can be done with aluminum mask. It's a problem due to size of tv. With iron: clean pads, put a tiny drop of tin on outer pin, put flux, place the component, warm pin with solder and move in place, put some tin on the tip then scroll the tip on the other side with clean pins, repeat with first side.

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