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noob need help identifyng resistor

Discussion in 'Troubleshooting and Repair' started by cresstt, Apr 14, 2012.

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  1. cresstt

    cresstt

    2
    0
    Apr 14, 2012
    hi all,

    I've a water damaged PCB board. I'm trying to replace burnt components but got confused on these 2 resistors. I've goggled (http://www.hobby-hour.com/electronics/resistor_color_code.php) and found reference on how to interpret resistor color bands.
    [​IMG]

    Can somebody please confirm that it is a 0.5 ohm for r34 and 160 ohm resistor for r36.

    I cant measure the value using a multimeter as both the resistors are burnt being recognition.
     
    Last edited: Apr 14, 2012
  2. KJ6EAD

    KJ6EAD

    1,114
    159
    Aug 13, 2011
    You're correct on the values. That last black band on the 160 Ohm resistor indicates a 250ppm temperature coefficient. Obviously the photo is not of the damaged board, just one like it.
     
    Last edited: Apr 14, 2012
  3. davenn

    davenn Moderator

    13,901
    1,970
    Sep 5, 2009
    and if it is the water damaged board, why do you think these 2 resistors are burnt ?

    until told otherwise, I will side with KJ6EAD's assumption :)

    Dave
     
  4. cresstt

    cresstt

    2
    0
    Apr 14, 2012
    thanks Kj6EAD and dave

    to answer Dave's question; water was dripping on Vr1 and somehow shorted Vr1, R34 and r36. All three components were burnt and black in color due to water shorting Vr1.

    R35 looks okay but I opted to change it anyway.

    The picture was from 2008, before I installed the PCB.

    Although VR1 is burnt but I can make out the first 4 letters which are LM31
    so I believe its a LM317T voltage regulator.

    Thanks!
     
  5. davenn

    davenn Moderator

    13,901
    1,970
    Sep 5, 2009
    ok no probs :)

    did you actually try measuring the values of R34 and 36 ?
    I have, over the years, seen some pretty charred resistors that are still very close to their nominal value. Tis always a good backup on their values when it comes to replacement :)

    Dave
     
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