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Help identifying power resistor value...

Discussion in 'Electronic Components' started by [email protected], May 6, 2006.

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  1. Guest

    Hello; I'm repairing/rebuilding a SMPS section of a TV and I'm a bit
    confused when I found a power sand-block resistor that says 5W 0.68 ohm
    10%; Now does this mean the resistor is 68 ohms OR under 1 Ohm? It is
    in series with the rectifier and supplies the ground (-) to the board,
    could I just bypass it? (use a jumper wire instead). I'm new to this
    electronic stuff.
  2. It is .68 ohm. Thats less than 1 ohm. Its just a ballast type resistor to
    absort power transients.
  3. ehsjr

    ehsjr Guest

    Perhaps not. It very well may be used as a current
    sensing resistor. In any even, he should not jumper
    it out.

  4. Absolutely do not jumper it out. May still work briefly, then zap. I doubt
    it would be a current sensor componet considering where it is in circuit.
    But without any more info as to rest of circuit, who knows.
  5. Being in series with the regulated supply, it might be working with a
    capacitor as a filter. Similar things are done with 1 ohm resistors in
    simple constant current laser drivers, between the regulator and a
    capacitor across the laser diode, to protect against high speed transients.
    That isn't usually done in the ground line, but it would work the same.
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