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Samsung UN65HU7250 Power Supply Repair

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    Samsung UN65HU7250 Power Supply Repair

    The supply is a BN44-00782A.

    Was told there was a "popping noise" and the set went dead. Upon inspection there was a split ceramic cap C814, a failed mosfet, either Q801 or Q802 I pulled and am replacing as a pair and of course the main fuse.

    I replaced the cap marked 221 1kv with a 221 2kv (which I think will be fine?) and will be getting the other parts today. The switching diodes at D801 and D802 look and test good but the ferrite beads at BB801 and BB802 appear to have taken much current and are discoloured though still test as a short.

    Do the properties of these beads change with heat/overcurrent such that they've become discoloured or are they fine ? I have no schematic and no way to measure them so can't replace with like for like.

    (pic in next post)
    Last edited by mmartell; 07-29-2022, 11:12 AM.

    #2
    Re: Samsung UN65HU7250 Power Supply Repair

    And here is a pic of the beads in question.
    Attached Files

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      #3
      Re: Samsung UN65HU7250 Power Supply Repair

      As long as thier intact and have continuity they should be fine. They are just compressed ferrite
      I assume no responsibility for any stupid suggestions I might post.

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        #4
        Re: Samsung UN65HU7250 Power Supply Repair

        Very good thanks for that.

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          #5
          Re: Samsung UN65HU7250 Power Supply Repair

          Power supply is reinstalled and tv is working. Thanks for the input.

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