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1.2 ohm 1w resistor replacement

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    1.2 ohm 1w resistor replacement

    I have a 1.2ohm 1w resistor that seems to need replacement. not sure what the rules are for them when replacing with others of not exact values. I dont have any locally, but I do have a 1.8ohm 3w ... this is next to a mosfet if that makes any difference. Thanks in advance!

    #2
    Re: 1.2 ohm 1w resistor replacement

    i've got one .97ohm 1w would that suffice?

    Comment


      #3
      Re: 1.2 ohm 1w resistor replacement

      Where is this going into? What kind of circuit?

      Why do you think the old one is bad? Measured resistance?
      veritas odium parit

      Comment


        #4
        Re: 1.2 ohm 1w resistor replacement

        If it's next to a mosfet it's likely a current sense resistor. You need that exact value. The old one is probably bad because it exploded as it often happens when the mosfet dies in this kind of circuit.
        Originally posted by PeteS in CA
        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
        A working TV? How boring!

        Comment


          #5
          Re: 1.2 ohm 1w resistor replacement

          it belongs to this thread:

          https://www.badcaps.net/forum/showthread.php?t=14701

          i blew out the Q803(mosfet) by shorting pins 2,3 ... i've replaced the Q803 and removed the R811 and tested it. I get infinite on the resistor while removed on all settings of the DMM. This machine is an elo 1525l monitor. I've got a same/ similar circuit on another elo 1547 that has a bad screen in it with horizontal lines. The parts are almost the same, just diff layouts. The Q803 was a mosfet sss4n60b replaced with an stp4nk60zfp for ok upgrade per plainbill. seems that i thought the resistor was good... i think it poped the R811 and during original testing I had it in circuit. now that its out its for sure bad? not sure of replacement resistors to be exact values... sucks i just got my digikey parts last week heheh. The elo 1547l had a mosfet of stp4nkzfp i was trying, but burned it up during removal somehow... bad luck i guess! replaced it in the donar 1547l (paying peter back), screen is the same but the repair from robbing it worked. Thats what i get from shorting it, then robbing peter to pay paul

          so elo 1525l had 1.2ohm 1w
          elo 1547l has .97ohm 1w ...would steal it since the screen is damaged to try to repair the other monitor.
          Last edited by BlkSmth; 06-12-2011, 12:07 PM.

          Comment


            #6
            Re: 1.2 ohm 1w resistor replacement

            The effect of using the lower value resistor in the sense circuit would be that the overcurrent protection will only kick in at a higher level. It'll work if you don't do dumb things around it.
            Originally posted by PeteS in CA
            Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
            A working TV? How boring!

            Comment


              #7
              Re: 1.2 ohm 1w resistor replacement

              It will take that as a two thumbs up for the lower value resistor .97ohm
              no, no, no more dumb things.........heheh I will post them results

              Comment


                #8
                Re: 1.2 ohm 1w resistor replacement

                Grrr.

                Please don't spread a discussion over multiple threads. Stay in the original post and let those guys handle it. This just wastes time and resources.

                You are correct that brown-red-gold-gold is 1.2Ω - 5%, not the 0.12Ω that was originally stated.

                0.12Ω - 5% would be brown-red-silver-gold
                veritas odium parit

                Comment


                  #9
                  Re: 1.2 ohm 1w resistor replacement

                  update #1:

                  the value of this resistor removed is 1.2 on the 200 setting thats a smile to me. even though its colors indicate .97ohm

                  gonna solder this bad dog in.

                  Comment


                    #10
                    Re: 1.2 ohm 1w resistor replacement

                    solder went ok. screen still the same... and no power to the top half of the board

                    Comment


                      #11
                      Re: 1.2 ohm 1w resistor replacement

                      Originally posted by BlkSmth View Post
                      the value of this resistor removed is 1.2 on the 200 setting thats a smile to me. even though its colors indicate .97ohm
                      That's the resistance of your multimeter probes at play.
                      Originally posted by PeteS in CA
                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                      A working TV? How boring!

                      Comment


                        #12
                        Re: 1.2 ohm 1w resistor replacement

                        Originally posted by Toasty View Post
                        Grrr.

                        Please don't spread a discussion over multiple threads. Stay in the original post and let those guys handle it. This just wastes time and resources.

                        You are correct that brown-red-gold-gold is 1.2Ω - 5%, not the 0.12Ω that was originally stated.

                        0.12Ω - 5% would be brown-red-silver-gold

                        Where did I post that value of 0.12? I dont recall that one.

                        Well the topic isnt off topic... The topic was infact about a hard part. (Resistor to be specific) This post was for (before I was asked questions) was simply to find out rules about resistors when replacing with correct/not correct values/watages. If you dont know, thats ok. I still dont know either. It's perfectly clear I am a noob on that subject. Is there a better spot on this forum that I should be asking this question other than:
                        " Badcaps Forums > Electronics Theory and Troubleshooting > General Electronics "
                        If there is/was a diff location to post this unusual question Toasy, it would be much appreciated if you'd being sharing that one with me. Then I'll oblige. Thanks for your time.

                        Comment


                          #13
                          Re: 1.2 ohm 1w resistor replacement

                          Keep it in the original topic where PlainBill and Retiredcaps were responding to you.

                          >>Where did I post that value of 0.12? I dont recall that one.<<

                          PlainBill did, not you. You later discovered the value correctly.
                          veritas odium parit

                          Comment


                            #14
                            Re: 1.2 ohm 1w resistor replacement

                            Since my meter likes to play (junk one for about 70.00) what would be a good one m8's'? The value of that .97ohm measured at 1.2 and my 1.8ohm measured at 2.2 ...thats .4-.5 off

                            Comment


                              #15
                              Re: 1.2 ohm 1w resistor replacement

                              Short the leads together and see what it reads. Then keep that value in mind and subtract it from any low value resistor you measure.

                              My best meter is currently an Uni-T UT60E. It's good, but there are a few things that would need improvement: The autorange is slow, the capacitance measurement has a high residual which needs to be removed with the relative button, and the backlight only works when the battery is brand new.
                              Originally posted by PeteS in CA
                              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                              A working TV? How boring!

                              Comment

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