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Mistakenly Pull off a part :(

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    Mistakenly Pull off a part :(

    I mistakenly pulled off a port of MK908, i will try to re-solder it but its too small. But when i tried to boot it worked. What can be the problem when its working? Why it worked?

    www.sacvideolari.com www.babatorik.com

    #2
    that's a surfacemount resistor it helps regulate voltage and current flow its probably for the USB/Wifi chip judging by its
    size I advise attempting to replace or repair it if its functional if you short it out you are liable to kill it
    there should be a number on the top of the part along with the color should tell you what the resistor was rated for
    current devices(rockchip sucks)
    Hardkernel ODROID C1 running android kitkat
    Hardkernel ODROID XU3-L Running Linux/openelec (primary media server)
    rPi model B+ running nothing ... bricked

    Comment


      #3
      Yeah, good luck soldering back a surfacemount component - so tiny. Everything may still appear to work OK but that resistor is there for a reason. If you can find out the resistance it may be possible to replace it with a conventional resistor, I guess (bigger and easier to handle), but it's still going to be a fiddly job.

      Comment


        #4
        You have two choices.
        Either you can take to a electronics / tv repair shop. Call them ahead of time tell them you only need a surface mount resister soldered. And they may only charge you a few lira's if you are lucky.

        The other choice you will need a variable power soldiering iron. Here is one on amazon.


        Yes you will need one. But you can do it with a regular one also. Apply to much heat and it will burn the pc board. And it will ruin your device. What I do if I absolutely don't have one. Is wait until the regular soldiering iron starts melting the soldier on the board and then unplug the soldering iron. Do what I need to do quickly. If it cools off to fast I plug it back in rinse and repeat. Be vary careful you may cause a cold soldering joint. Plenty of videos on youtube or else where to learn how to soldier correctly.

        It's imperative that it must be replaced.

        To add to Legitsu statement.
        A small thought of what a resister is: Think of kinking a garden hose. The kink "resists" the flow of water.
        And if that "garden hose" isn't there. It will put a lot of voltage/current across the rest of that circuit. Or worse cut that circuit off completly. Which is something you don't want.

        Comment


          #5
          Originally posted by spifey View Post
          You have two choices.
          Either you can take to a electronics / tv repair shop. Call them ahead of time tell them you only need a surface mount resister soldered. And they may only charge you a few lira's if you are lucky.

          The other choice you will need a variable power soldiering iron. Here is one on amazon.


          Yes you will need one. But you can do it with a regular one also. Apply to much heat and it will burn the pc board. And it will ruin your device. What I do if I absolutely don't have one. Is wait until the regular soldiering iron starts melting the soldier on the board and then unplug the soldering iron. Do what I need to do quickly. If it cools off to fast I plug it back in rinse and repeat. Be vary careful you may cause a cold soldering joint. Plenty of videos on youtube or else where to learn how to soldier correctly.

          It's imperative that it must be replaced.

          To add to Legitsu statement.
          A small thought of what a resister is: Think of kinking a garden hose. The kink "resists" the flow of water.
          And if that "garden hose" isn't there. It will put a lot of voltage/current across the rest of that circuit. Or worse cut that circuit off completely. Which is something you don't want.
          my concern is his ability todo it stuff that small is generally very finiky
          if he contiunes to run it might very well burn up you are right at that point but given his slicon and superglue job there I question his ablity
          current devices(rockchip sucks)
          Hardkernel ODROID C1 running android kitkat
          Hardkernel ODROID XU3-L Running Linux/openelec (primary media server)
          rPi model B+ running nothing ... bricked

          Comment


            #6
            Originally posted by Legitsu View Post
            my concern is his ability todo it stuff that small is generally very finiky
            if he contiunes to run it might very well burn up you are right at that point but given his slicon and superglue job there I question his ablity
            Yeah.. NO OFFENSE intended to OP.. but that glue job there is quite scary.
            Question Reality: Find Your Own Truth!

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            Comment


              #7
              Originally posted by Legitsu View Post
              my concern is his ability todo it stuff that small is generally very finiky
              if he contiunes to run it might very well burn up you are right at that point but given his slicon and superglue job there I question his ablity
              OMG. Does he have any idea what happens if a soldiering iron is introduced to superglue?
              Shield your eyes and nose and make sure you don't breath that stuff in. Or you will be hurting for days.

              Am I the only one who never heard of Cyanoacrylate?
              Also I could of sworn heat sinks came with a clip for a reason

              Another factor. They should only be used with semiconductors.

              Come on guys you can hack saw those heat sinks to fit and cut your clip and soldier it to a earth ground like you are suppose to.

              Comment


                #8
                Wow... no offense to the OP but you do not use silicon to apply heatsinks! Silicon is a isolator not a conductor of heat! You probably made your cooling worse.

                As for surface mount repair. It can be done by hand but not with a 2x4 sized soldering iron!
                You have to get the correct equipment!
                Temp controlled small tipped soldering iron (not cheap).
                Proper tools to hold the part in place and proper solder.
                Steady hands and a good desk magnifying glass.

                Bob
                "Pzebacz im, bo nie wiedzą, co czynią"
                "Прости им, они не ведают, что творят"
                "Perdona loro perché non sanno quello che fanno"
                "Vergib ihnen, denn sie wissen nicht, was sie tun"
                "Vergeef hen want ze weten niet wat ze doen"
                "Pardonne-leur car ils ne savent pas ce qu'ils font"
                "Perdónalos porque no saben que lo que hacen"
                "Oprosti im, jer ne znaju što čine"
                "Forgive them as they know not what they do"





                Comment


                  #9
                  you can't not simply install heatsinks with paste and glue you won't ever get enough pressure on them to be effective and whats worse you will end up with airpockets
                  current devices(rockchip sucks)
                  Hardkernel ODROID C1 running android kitkat
                  Hardkernel ODROID XU3-L Running Linux/openelec (primary media server)
                  rPi model B+ running nothing ... bricked

                  Comment


                    #10
                    Thanks for a good laugh. Solder flux is your friend when it comes to small soldering jobs like these. Here is a tip, pre tint the ends before you solder the resistor back to the board. While you at it, take that goop off your stick.

                    Comment


                      #11
                      Yup, silicone was just there for sticking heatsinks to chip. But didnt work because heat too much and its melted the silicone. between the chip and heatsinks, there was thermal paste. But i have take all away and cleaned up the chips and heatsinks.

                      First i will give it to our technical department tomorrow, they will re-solder the resistor back, and i will stick heatsinks with thermal band to the chips;

                      www.sacvideolari.com www.babatorik.com

                      Comment


                        #12
                        Originally posted by EzerchE View Post
                        Yup, silicone was just there for sticking heatsinks to chip. But didnt work because heat too much and its melted the silicone. between the chip and heatsinks, there was thermal paste. But i have take all away and cleaned up the chips and heatsinks.

                        First i will give it to our technical department tomorrow, they will re-solder the resistor back, and i will stick heatsinks with thermal band to the chips;

                        http://solutions.3m.com/wps/portal/3...BC31gv%29&rt=d
                        Thermal tape IF for whatever reason the job remains too small, you can always solder the resistor to a 28 gauge wire and attach it back to the board. Speaking from experience here. LOL

                        Comment


                          #13
                          Originally posted by creationsh View Post
                          Thermal tape IF for whatever reason the job remains too small, you can always solder the resistor to a 28 gauge wire and attach it back to the board. Speaking from experience here. LOL
                          I have resoldered it myself its working but i need to find thermal bands to buy urgently!
                          www.sacvideolari.com www.babatorik.com

                          Comment

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