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Testing the Inverter on Samsung PSU BN44-00150A

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    Testing the Inverter on Samsung PSU BN44-00150A

    Hi all, looking for tips on how to test the on board inverter on power supplies for the larger (50") Samsung power supplies. I'm getting more & more of these in lately , mainly the caps/relay clicking issue but now had a few where there's possible inverter problems i.e the complaint is Sound is ok but no display .

    Obviously i can't have an inverter board/panel in stock for every different PSU that comes in so i need a way of testing just the inverter circuitry built into the PSU. I understand that the PSU connects to Inverter balance boards that distribute the high voltage equally along to the tubes but i need to be able to just check the onboard circuitry. also, although i have the service manual for the receiver (LE52M87BDX) the circuit diagrams do not show any of the inverter circuitry , just the normal standby & DC outputs. Anyone know:

    (a) where there is a circuit showing the inverter circuitry ona 50-52" set

    (B), Whats the output voltage from the transformer that connects to the inverter balance boards.

    (c) should i be able to connect normal CCFL inverter tubes directly to this transformer output or do i need these balance boards. I dont want to overdrive the onboard inverter by caoonecting a couple of tunes up directly. I know the output will be over 1KV so need a reliable way of safely testing without the inverter circuit shutting off.


    Thanks in advance

    Graham
    Last edited by nogger; 09-25-2012, 09:42 AM.

    #2
    Re: Testing the Inverter on Samsung PSU BN44-00150A

    A. Here's one for the 40" models: It should give you a start.

    B. The output voltage is around 3-4kV with an ~8kV starting pulse.

    C. No if you connect ordinary tubes they will melt/burn/smoke. Ordinary tubes ignite with around 1-2kV, then run at 600-1000V.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      #3
      Re: Testing the Inverter on Samsung PSU BN44-00150A

      Tom66 , many thanks for the drawing .

      I actually have a cracked samsung panel lying around but it doesn't have the inverter board with it. Taking your point on board of not using ordinary CCFL tubes from a small monitor, if i find a way of connecting a couple of these tubes to the PSU inverter output will that work do you think or does the balance board reduce the 3-4kv downwards.
      Graham

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        #4
        Re: Testing the Inverter on Samsung PSU BN44-00150A

        The balance board does the voltage dropping; I'm not at all sure how, but it's also involved in making sure each bulb gets the same current (hence balancing...)
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment


          #5
          Re: Testing the Inverter on Samsung PSU BN44-00150A

          IF you look at the LCD panel spec, it should give you the Voltage/current requirement of the T-CON, LAMPS, etc.
          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


            #6
            Re: Testing the Inverter on Samsung PSU BN44-00150A

            Thatsagood idea budm, why didnt i think of that :-)

            Graham

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