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Samsung P2270HD/LS22EMDKU - 2s To Black

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    #1

    Samsung P2270HD/LS22EMDKU - 2s To Black

    Sammy has a 2s to black condition, stays switched on, has image (flash light test) Capacitors are Sam Young of which I have not yet replaced. Have read about the 2s to black condition in the previous thread. Am I correct in thinking that even though the power supply board appears to be operating i.e stays switched on etc, it could still have some faulty capacitors?
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    #2
    Re: Samsung P2270HD/LS22EMDKU - 2s To Black

    Yes the power supply is working but the inverter portion is not.

    2 sec to black can also be bad inverter transformer, diodes, transistors or caps.

    Those caps though look relatively new but wouldn't be a bad thing to check them.

    Did you look at this sticky?
    https://www.badcaps.net/forum/showthread.php?t=10419

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      #3
      Re: Samsung P2270HD/LS22EMDKU - 2s To Black

      2 seconds to black can be

      a) bad caps
      b) bad ccfls
      c) bad ccfl wiring (especially the return wiring)
      d) bad secondary windings on the inverter transformer

      More details starting with post #19 at

      https://www.badcaps.net/forum/showthread.php?t=10419

      Also, see budm's Inverter tester using old CFL

      https://www.badcaps.net/forum/showthread.php?t=19987

      PS. Your transformer should read around 1K according to

      http://lcdparts.net/TransformerDetai...ProductID=3722

      PPS. I love the fighter jets avatar.
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        #4
        Re: Samsung P2270HD/LS22EMDKU - 2s To Black

        Re-checked component values once again. There are two identical value resistors close to T301 which are R301 and R302. The bands are brown/white/yellow which I read as being 190K. The actual reading on R301 = 0.377M ohms and R302 = 0.384M ohms.

        If I'm checking T301 correctly, I have 000.2 ohms between primary windings, 0.761M ohms between one secondary winding and 1.073 ohms between the other secondary winding (as per photo)
        Attached Files

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          #5
          Re: Samsung P2270HD/LS22EMDKU - 2s To Black

          Do you perhaps mean 1.073k ohms between secondary readings? Very few multimeters measure down to milliohms. In which case, if one secondary measures 761k and one 1.073k, you have found the open secondary, it's the 761k one.
          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

            #6
            Re: Samsung P2270HD/LS22EMDKU - 2s To Black

            Re-checked again and yes you are correct, should be 761K on one secondary and 1.073K on the other. Think my 'grey matter' is finally going!

            Have to way up the costs of parts against buying a second hand board?

            Comment

              #7
              Re: Samsung P2270HD/LS22EMDKU - 2s To Black

              Well, a transformer is pretty cheap IF you can acquire it, as they aren't always available.
              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

                #8
                Re: Samsung P2270HD/LS22EMDKU - 2s To Black

                http://www.chsinteractive.co.uk/elec...80-general.htm

                Comment

                  #9
                  Re: Samsung P2270HD/LS22EMDKU - 2s To Black

                  Thanks for the link!

                  Comment

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