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Resistor value & visible condition?

Discussion in 'Electronic Repair' started by Mark, Jun 25, 2005.

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  1. Mark

    Mark Guest

    I have just opened an Enermax PC power supply that has very reduced power
    output (<2v on 5v & 12v connectors). Upon visual inspection I see
    encrustation on one resistor which has dripped down onto a capacitor(?).
    This I am assuming is only adhesive that was dropped on it and subsequently
    burned during operation but am not positive as the very small puddle at the
    bottom is reminiscent of what I have seen from leaking capacitors.

    Anyhow, just for the heck of it I removed the resistor for inspection and
    notice a value of 15.62kohm. If I am correct in reading my bands it should
    be a 25kohm +/-5%. If so this leaves me skeptical and wanting to replace it
    even though I do not at all believe it is the cause of my PSU failure. What
    I'm not sure of is the exact value of the resistor? Pretty positive that I'm
    correct in reading it as a 25kohm unit but what wattage is it? Sure looks
    like no resistor that my local Radio Shack stocks which are mainly 1/4 & 1/2
    watt units.

    Here are links to pictures of the resistor in question:
    http://home.comcast.net/~mig317/temp/resistor_mounted.jpg
    http://home.comcast.net/~mig317/temp/resistor_unmounted.jpg

    Any info or advice regarding this resistor would be greatly appreciated.

    Best Regards,
    Kj
     
  2. Ken Weitzel

    Ken Weitzel Guest

    Hi...

    Perhaps the colours in the picture don't come out quite
    right.... but if they do looks like 7500 ohms to me :)
    (violet-green-red?)

    Ken
     
  3. NSM

    NSM Guest

    I'm seeing red-green-orange!

    N
     
  4. Ken Weitzel

    Ken Weitzel Guest

    Hi...

    Oops. Not on my monitor :)

    Even looked again - same thing :)

    I guess that kinda means maybe we oughtn't depend on
    digital pictures for this kinda stuff, eh?

    Ken
     
  5. Guest

  6. Mark

    Mark Guest

    Wow! You guys are quick to reply!

    Maarten could be correct. I have been reading it as red/green/orange but my
    red is quite dull/muddy and could be brown. Fwiw, I do much video editing
    therefore calibrate my monitors often. On my end the colors display as true
    as the part in front of me. Ken is right though as I understand the problems
    with monitor calibration of the masses...no two are exactly the same and a
    question like this could be quite confusing. ;-)

    Now that I'm not even sure of my ohms value (lol) which I thought I was,
    anyone have an opinion on the possible origin of the encrustation? Errant
    adhesive put through heat cycles...or leakage? Plus, does the body color
    gray give me any additional information about the resistor? Watts, material,
    type, etc?

    Thanks again guys for the very swift responses!
     
  7. NSM

    NSM Guest

    Even the resistors themselves are getting harder to ID. Why they would make
    the body red I will never know.

    N
     
  8. Jamie

    Jamie Guest

    brown/green/org gold

    15k 5%
     
  9. Looks like Brown-Green, but the third is tough. If RED (hundreds) if
    Orange (Thousands) so 1.5K or 15K Gold=5%
     
  10. http://www.aikenamps.com/ResistorColorCode.htm
     
  11. Guest

    Almost certainly the brown stuff is glue. I guess the resistor is of a
    wirewound, non-flammable type, at least 1W.
     
  12. Pierre

    Pierre Guest

    I agree: with +-5% Tolerance, it can't be 25 K nor 75 K
    Nprmalized values within the E12 series are:
    1 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.7 5.6 6.8 8.2
     
  13. Mark

    Mark Guest

    Thanks Maarten. That is the info I was looking for.

    Assuming Br/Gr/Or the ohms test is spot on at 15.3k meaning that there
    really is no need for replacement now. Much appreciate your informative
    replies. ;-)

    Cheers!
     
  14. Mark

    Mark Guest

    I believe we have a consensus on the br/gr/or. Appreciate the input!

    Cheers!
     
  15. Mark

    Mark Guest

    Appreciate the reply and link John. Pretty positive on the orange and now
    going to go with the groups advice and agree with Br/Gr.

    I Thank you and everybody else that replied to my query. :)))

    Cheers!
     
  16. quietguy

    quietguy Guest

    And on my monitor it looks like a 15k - brown/green/orange

    David
     
  17. Ross Herbert

    Ross Herbert Guest

    Looks more like a 1 or 2W metal oxide power resistor to me. Certainly
    not wire wound.
     
  18. Guest

    You are probably right, it is much too small to fit 15k worth of wire
    on...
     
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