LG Flatron L1933TR

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  • hardwareguy
    Badcaps Veteran
    • Jun 2006
    • 405
    • USA
    #1

    LG Flatron L1933TR

    My friends monitor is going under the soldering iron tonight. It made weird squealing noises about a month before it died outright.

    Its got two bulged Samxon GF series caps, no surprise there. There is no pi filter on the +12V rail! There's a spot for an inductor, but its just jumpered! The 5V rail has a pi filter.

    Due to this lack of a pi filter, Im going to order some high ripple caps...probably some Nichicon HV.

    Values are as follows:
    C202: 25V 1000uF
    C203: 25V 680uF
    C204: 16V 1000uF
    C205: 16V 1000uF
    C206: 25V 1000uF
    C207: 25V 470uF

    C103 is also a GF, 50V 33uF. This looks like a pull up cap for the SMPS controller which is an FAN7601. The inverter output stage is weird. Each xfmr is driven by a 4511GD MOSFET in a strange 8 pin DIP package. These things get HOT; the board is discolored! TO220 would have been a better choice.
    Tags: None
    • EGuevarae
      Badcaps Legend
      • Nov 2008
      • 1336
      • USA
      #2
      Re: LG Flatron L1933TR

      Originally posted by hardwareguy
      My friends monitor is going under the soldering iron tonight. It made weird squealing noises about a month before it died outright.

      Its got two bulged Samxon GF series caps, no surprise there. There is no pi filter on the +12V rail! There's a spot for an inductor, but its just jumpered! The 5V rail has a pi filter.

      Due to this lack of a pi filter, Im going to order some high ripple caps...probably some Nichicon HV.

      Values are as follows:
      C202: 25V 1000uF
      C203: 25V 680uF
      C204: 16V 1000uF
      C205: 16V 1000uF
      C206: 25V 1000uF
      C207: 25V 470uF

      C103 is also a GF, 50V 33uF. This looks like a pull up cap for the SMPS controller which is an FAN7601. The inverter output stage is weird. Each xfmr is driven by a 4511GD MOSFET in a strange 8 pin DIP package. These things get HOT; the board is discolored! TO220 would have been a better choice.
      I've worked with that units in the past: be sure to replace that little guy (C103), as it has given me trouble more than once.
      Eduardo
      There are 10 kind of people in this world: those that understand binary, and those who don't.
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        Comment

        • hardwareguy
          Badcaps Veteran
          • Jun 2006
          • 405
          • USA
          #3
          Re: LG Flatron L1933TR

          The little one got changed as well...since I had to order in caps, not ordering a $0.20 capacitor for a $200 display would have been stupid.

          I ended up using a mixture of Nichicon HV and HM (new stock of course!) due to supply issues with the HV series.

          The 50V cap was a UCC KY series IIRC.....any low ESR will work.

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