Samsung 65" UE65F6400AF ramdomly power cycles

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  • FerociousBC
    New Member
    • Oct 2025
    • 1
    • USA
    #1

    Samsung 65" UE65F6400AF ramdomly power cycles

    Hello all,

    Samsung 65" TV that randomly power cycles. It could be a few hours or a few minutes and then I hear a click sound and reboots. I have updated the firmware to the latest. I'm suspecting the power supply might have bad caps (hoping 🙏...). Inspected the PSU board and none of the caps have any bulging, leaking, or unusual noises that I can hear. Any suggestions? Thanks

    PSU: L65X1Q_DHS / BN44-00627A
    Model: UE65F6400AFXZA
    Ver No: MH01

    Last edited by FerociousBC; Today, 08:49 AM.
    Tags: bn44-00627a, l65x1q_dhs, power, psu, ue65f6400
    • Diah
      Badcaps Legend
      • Feb 2013
      • 6441
      • Germany
      #2
      bulging caps not the only sign of bad one.. ESR measurement the correct way, if you are not able to measure ESR, i would suggest you to replace all caps at the Cold Area, they are not expensive.

        Comment

        • lotas
          Badcaps Legend
          • Jan 2016
          • 4759
          • Russia
          #3
          Check the cable and its connectors that connect the motherboard to the power supply (burnt contacts, poor contact), a common problem in this chassis.

            Comment

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