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Shorting DC power supplies together

Discussion in 'Electronic Repair' started by Salman, Mar 9, 2007.

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  1. Salman

    Salman Guest

    I connected an 9.4Vdc 400mA power supply for external pc speakers to a
    12V power supply line from the back of my Dell 20" FP LCD monitor
    intended for an optional "speaker bar" that Dell sells. Suffice to
    say, neither the monitor nor the dc power supply are working. Anyone
    know what to look for to repair the monitor? Is it salvageable?
    Possible just some components near the power supply outputs needing
  2. Larry P

    Larry P Guest

    I can only assume that the Dell people were smart enough to assume someone
    would short out the power output line as you just did. And I can assume that
    they probably put a fuse in their internal Power supply that would protect
    that Power line. Open her up and check for a fuse.
    If your lucky, you blew it out. If your not lucky, you took out the Monitor

  3. Arfa Daily

    Arfa Daily Guest

    I would start by looking for fuses / circuit protectors / safety resistors.
    These may not be too obvious, as they likely will not look like something
    that you would traditionally identify as a fuse - ie a glass or ceramic tube
    with end caps. Many fuses in this type of equipment, are about the size of a
    1/4 watt resistor, and are wire ended. Circuit board silk screening may call
    them "F", "CP" or "ICP" and there might be a rating also silk screened on.
    Other types look like a little cylinder, and have a rating written on their
    flat top. Still others, are surface mount, and are usually about the size of
    the surface mount decoupling caps that you see scattered all over boards
    these days. Finally, if a safety resistor type, then it will actually look
    like a resistor.

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