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Another SAMSUNG 2493HM !

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    #81
    Re: Another SAMSUNG 2493HM !

    Good, now we know what your AC line voltage is. Then you need to have that rectangular blue cap checked out.
    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

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      #82
      Re: Another SAMSUNG 2493HM !

      Originally posted by budm View Post
      Good, now we know what your AC line voltage is. Then you need to have that rectangular blue cap checked out.
      It was measured, out of circuit, and returned a value of 12 nF.

      Comment

        #83
        Re: Another SAMSUNG 2493HM !

        That is OK, as far as the ESR is good. Also check CM802 and CM809.

        Just a wilde guess, but as long as you have been soldering there, try continuity test between +5,4/+24 V and GND, if there is not some short.
        Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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          #84
          Re: Another SAMSUNG 2493HM !

          On the subject of 2493HMs, can anyone tell me what IC107 on the logic board was? That part is bubbled up and the legend unreadable. The logic board number is BN41-00962A. The IC in question is adjacent to the smaller of the two cables that connects between the power supply and the logic board. I can make out "7..26" on the top row and '321{3 or 5}D' in the bottom row.

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            #85
            Re: Another SAMSUNG 2493HM !

            Drop me a PM in 12-20 hours from now, I will have a look. Otherwise I'll forget…
            Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

            Exclusive caps, meters and more!
            Hardware Insights - power supply reviews and more!

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              #86
              Re: Another SAMSUNG 2493HM !

              Another 2493HM saved by this thread...

              - Only 5.3V standby voltage present
              - Both FQPF9N50C FETs shorted and RM801 open
              - One FQPF9N50C drive transformer secondary open due to glue dissolving wire in a bobbin groove above the mounting pin.

              - Scraped glue off everything!
              - Replaced RM801, both FQPF9N50C FETs, diodes and zeners in the FQPF9N50C circuit.
              - Repaired the transformer by digging glue out of bobbin groove to expose a mm of wire, and adding a piece of 30 AWG wire wrap wire to extend it out to rhe mouting pin. Wow, that 30 AWG wire looked huge under a microscope compared to the original transformer lead!
              - As one 5V output cap was bulging, replaced all electrolytic caps except the main 82uf one.

              Another monitor saved from the recycler thanks to the deep knowledge shared by the Badcaps.net community.

              Thanks all!

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