Help with Capacitor Selection

Discussion in 'The Projects Forum' started by newtonium, Mar 2, 2011.

  1. newtonium

    Thread Starter New Member

    Jun 5, 2010
    3
    0
    My Samsung Monitor (320P) is flashing about 100 times during power up. I have isolated the problem to 3 bad Capacitors in the main power supply just by their appearance (Domed Tops). This is a typical problem facing Samsung Monitors.

    The Capacitor Values are:

    1000uf/35v/105 deg.C/Radial/Through Hole/12mm(D) x 23mm(L)

    2200uf/35v/105 deg.C/Radial/Through Hole/16mm(D) x 30mm(L)

    The unknown Values are Tolerance and ESR. Would 10% be okay, or should I look for a lower Tolerance? I have no idea what would be a good ESR Value.

    Any suggestions would be helpfull

    Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    10% should be fine. Make sure to get 105°C specified caps, and at least the specified voltage. Don't worry too much about ESR.
     
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  3. newtonium

    Thread Starter New Member

    Jun 5, 2010
    3
    0
    ESR- milliOhms or MegaOhms.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    MilliOhms.
    You'll likely see specs in the ~20m Ohm to 80m Ohm range. Lower is better; less heat build-up.
     
  5. newtonium

    Thread Starter New Member

    Jun 5, 2010
    3
    0
    Excellent. Now I can pick what I need from thousands.
     
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