Strange color code on resistor, Help!

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • double
    New Member
    • Apr 2014
    • 8
    • USA

    #1

    Strange color code on resistor, Help!

    Hello all,

    I am looking to replace a torched resistor, I am repairing a Power supply and replaced the affected transistors already but still have not figured this resistor out. The color code seams to be BROWN, BLACK, SILVER, GOLD, SILVER,.. which does not make sense, even if the 5th was a "reliability" band.. It measures about 6mm so I believe its ¼ Watt. Its marking on the PCB is R301; definitely not a inductor. Any help would be greatly appreciated.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Strange color code on resistor, Help!

    Is the 3rd really silver or Grey?

    https://cdn.badcaps-static.com/pdfs/...2bf2eda94b.pdf
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • double
      New Member
      • Apr 2014
      • 8
      • USA

      #3
      Re: Strange color code on resistor, Help!

      Originally posted by budm
      Take a look at the high res photos. you be the judge..

      The grays im used to tend to have a more flat matte look, in my experience. the brown and black have that matte look as well. the Gold/Silvers usually have more of a foil look. this is the first resistor to really puzzle me.


      is it possible colors were altered when it burned out?

      If the third was gray, the fifth would have to be too (they look identical) and that makes no sense as well because that would make the tolerance gray.

      Whatever color it is, the third and fifth are the same, unless the color got altered, i don't think a manufacturer would make the gray and silver so close in appearance.

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30964
        • Albion

        #4
        Re: Strange color code on resistor, Help!

        i'v seen these before.
        i think - maybe, that the last band indicates the wattage.
        because it's a fuseable safety resistor.

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3900
          • Canada

          #5
          Re: Strange color code on resistor, Help!

          It looks like a 0.1R 5% 1/4W metal film flameproof (pink body) resistor (BRN,BLK,SILVER,GOLD) and the 5th band can denote what kind of resistor it is. A white band usually means fusible (for Panasonic and Yageo). But yours is silver? I guess it's another brand. resistor calculator
          Probably current-sense on the source/emitter of the SMPS power transistor.

          Comment

          • double
            New Member
            • Apr 2014
            • 8
            • USA

            #6
            Re: Strange color code on resistor, Help!

            I was going to say, Iv heard of white bands denoting fusible, but not silver, but that makes the most sense. I just dont want to replace it with the wrong value..

            Comment

            • Andrew F. Ali
              Badcaps Legend
              • Jan 2014
              • 2450
              • Trinidad & Tobago

              #7
              Re: Strange color code on resistor, Help!

              I'll start with a 10 Ohm. Then try a 1 Ohm, then the 0.1 Ohm resistors. Hardly think it would be 10 x 8-0s = 1 exp 9-0s may be stretching a bit. :-)

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Strange color code on resistor, Help!

                Can you show us the board and where the resistor is connected to?
                Last edited by budm; 05-02-2014, 07:38 PM.
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • redwire
                  Badcaps Legend
                  • Dec 2010
                  • 3900
                  • Canada

                  #9
                  Re: Strange color code on resistor, Help!

                  double, yeah a picture of the board helps.
                  That (sense) resistor going open-circuit would damage the IC too, from what I have seen.

                  Comment

                  • double
                    New Member
                    • Apr 2014
                    • 8
                    • USA

                    #10
                    Re: Strange color code on resistor, Help!

                    Sorry for the delay, here is a photo. hard to see because heat-sink is in place, you could see "R304" is where the resistor was pulled form.









                    I was looking for a 10.8 ohm resistor with a .05% Tolerance. No dice at mouser or digikey..Actually digikey has a 10.8, .5% 1/2 Watt, which maybe my safest available bet to start..

                    Let me know what you think.
                    Last edited by double; 05-08-2014, 06:55 PM.

                    Comment

                    • bammbammfran
                      Badcaps Veteran
                      • Apr 2014
                      • 476
                      • USA

                      #11
                      Re: Strange color code on resistor, Help!

                      your last band is silver so it should be 10%
                      digikey does have a 10.8 5% but NOT IN STOCK
                      you're best bet is probably an 11 ohm 5% which they have in several wattages
                      yours is probably 1w based on size, I would go for 2

                      Comment

                      • double
                        New Member
                        • Apr 2014
                        • 8
                        • USA

                        #12
                        Re: Strange color code on resistor, Help!

                        Originally posted by bammbammfran
                        your last band is silver so it should be 10%
                        digikey does have a 10.8 5% but NOT IN STOCK
                        you're best bet is probably an 11 ohm 5% which they have in several wattages
                        yours is probably 1w based on size, I would go for 2
                        If the last band is silver than so is the third, they are undoubtedly the same colors. It measures about 6mm so I believe its ¼ Wattr..I contacted digikey technical support and they are baffled as well..Id buy another power supply if they weren't so much compared to the cost of the resistor : /

                        Comment

                        • bammbammfran
                          Badcaps Veteran
                          • Apr 2014
                          • 476
                          • USA

                          #13
                          Re: Strange color code on resistor, Help!

                          well since the 4th is gold, I do not think that the 3rd band is that critical
                          the 1watts are 6.5 mm in the 11ohm

                          they do have the 10.5 in 1/4watt MFR-25FBF52-10R5
                          and 10.7 in 1/4watt MFR-25FBF52-10R7

                          for .2 ohms difference, ASSUMING yours is a 10.8, I would use the 11 and a higher wattage

                          they are cheap enough at about 10cents ea, get a couple of each ??

                          Comment

                          • bammbammfran
                            Badcaps Veteran
                            • Apr 2014
                            • 476
                            • USA

                            #14
                            Re: Strange color code on resistor, Help!

                            well
                            I did a bunch of searching and reading datasheets and I found 4 resistors that had a 5th band that was not for tolerance
                            but non were silver
                            I found a white (flameproof), black (flameproof noninductive) and violet (high power) on Yageos
                            and a blue (flameproof) on a TT electronics
                            A few companies do not even mention color codes on their datasheets which didn't help

                            I guess go with your note
                            "I'll start with a 10 Ohm. Then try a 1 Ohm, then the 0.1 Ohm resistors"

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Strange color code on resistor, Help!

                              Can you tell me if one end of the resistor is connected to the + leg of the main filter cap? If it is, then it is fusible resistor for feeding the B+ to the circuit. And because it is blown open, then you may have shorted circuit some where so the components such as diodes, MOSFETs should be checked before installing the new resistor.
                              Last edited by budm; 05-09-2014, 08:50 AM.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • bammbammfran
                                Badcaps Veteran
                                • Apr 2014
                                • 476
                                • USA

                                #16
                                Re: Strange color code on resistor, Help!

                                looks like we can add green to a fifth unknown band
                                I have several of these pink bodied ones with X-X-silver Gold-green

                                and I found an even more odd one
                                green bodied- red-red-silver-black-GOLD from an apple G4 supply

                                My tester isn't good under .5 and all these read under .4

                                So I guess that yours might just be a .1 - 5% with an unknown silver band

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Strange color code on resistor, Help!

                                  BTW, this power supply board, what is it used in? Any P/N? I can see it is made by DELTA.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • stj
                                    Great Sage 齊天大聖
                                    • Dec 2009
                                    • 30964
                                    • Albion

                                    #18
                                    Re: Strange color code on resistor, Help!

                                    green final band = 0.5%

                                    maybe when we see stuff like this, we should meter them to get a bit of info built-up.
                                    i'll keep an eye out from now on and make checks on strange parts.
                                    Attached Files

                                    Comment

                                    • bammbammfran
                                      Badcaps Veteran
                                      • Apr 2014
                                      • 476
                                      • USA

                                      #19
                                      Re: Strange color code on resistor, Help!

                                      Originally posted by stj
                                      green final band = 0.5%

                                      maybe when we see stuff like this, we should meter them to get a bit of info built-up.
                                      i'll keep an eye out from now on and make checks on strange parts.
                                      that would be true with the green if the silver and gold were not 3rd and 4th
                                      and I did meter them to below .4ohms which I did mention

                                      Comment

                                      • ben7
                                        Capaholic
                                        • Jan 2011
                                        • 4059
                                        • USA

                                        #20
                                        Re: Strange color code on resistor, Help!

                                        The last one might be the temp coefficient. Some manufacturers mark that on there as an extra band.
                                        Muh-soggy-knee

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Document Archive
                                          LCD LED TV Service Menu Codes
                                          by Document Archive
                                          ALL LCD LED TV SERVICE MENU CODES

                                          Service Menu Code with Board Name

                                          China Universal Board / Jumper Board Service Menu Code
                                          Changhong Ruba Service Menu Code
                                          Ecostar LED TV Service Menu Code
                                          Orient LED TV Service Menu Code
                                          Haier LED TV Service Menu Code
                                          TCL LED TV Service Menu Code
                                          Samsung LED TV Service Menu Code
                                          LG LED TV Service Menu Code
                                          Videocon LED TV Service Menu Code
                                          Supra LED TV Service Menu Code
                                          Toshiba LED TV Service Menu Code
                                          Symphony LED TV Service Menu Code
                                          Veste/ LED TV Service Menu Code...
                                          10-31-2024, 03:58 AM
                                        • jinu_j
                                          Dell 2209WA - power supply - Fusible Resistor replacement
                                          by jinu_j
                                          Hi

                                          I am trying to repair an ancient Dell 2209WA Monitor which suddenly shut off with a pop sound. On investigation found that one of the fusible resistors had blown. Further investigation identified multiple components as faulty because of which the fusible resistor blew. Please refer the attached circuit diagram showing the components that were found to be damaged.

                                          1. FR950 - blown fusible resistor - 0.2 Ohm 1W
                                          2. Q950 - shorted Q950 MOSFET - 650V 10A N Channel Mosfet
                                          3. R835 - Blown Resistor - 20KOhm SMD resistor
                                          4. D930 - Shorted Schottkey Diode...
                                          05-03-2025, 10:51 PM
                                        • MidnightRoller
                                          Can a resistor lose resistance after hot air?
                                          by MidnightRoller
                                          I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.

                                          I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors...
                                          02-02-2022, 11:46 PM
                                        • Askic
                                          Reading resistor value by color band
                                          by Askic
                                          Hello,

                                          attached is a picture with two resistors. I wonder what values are based on color of the band.
                                          I have used this as a reference:
                                          https://www.electronics-tutorials.ws...tor/res_2.html

                                          Since there are 5 bands, the question is from where to start counting (what is the first band).
                                          Based on this info, I can conclude that thick band is the last one.
                                          Therefore the values are:
                                          Left resistor - red(2) yellow(4) black(0) black (x1) brown (1% tol) = 240 ohm, 1% tolerance
                                          Right resistor - brown(1) black(0) black(0) gold(x0.1)...
                                          02-10-2022, 12:26 AM
                                        • artvandalai
                                          What resistor ohm will work better to repair this waterpik?
                                          by artvandalai
                                          The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor https://www.youtube.com/watch?v=_J7_rV7ui1Y
                                          01-05-2025, 04:10 PM
                                        • Loading...
                                        • No more items.
                                        Working...