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Newbie potentially fried a circuit on AKAI MPK25

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    Newbie potentially fried a circuit on AKAI MPK25

    So I picked up an AKAI MPK25 (a controller for music) and got a great deal because the usb was ripped out of it, but i was able to power it up and figured since I was starting soldering around the same time this would be a great test to repair and profit if I didn't really get into it as I have a number of other hobbies.

    So I ordered some type b usb female connectors to replace the broken one. I used flux because the type b usb has small holes that i was having trouble clearing out, but eventually got through it all and was able to mount (poorly) the usb to the board. In a rush of excitement plugged in the usb cable to the device and to my pc that powers it up without wiping or cleaning off the flux, and it worked for 10 seconds just fine, until it didn't. It still show signs that power is getting to it when plugged in, but it's not operating correctly, as if it it is only receiving a very small or minimal amount to show any activity and my computer does not recognize it. This happens when I use the power cable as well. So, it's worse off than when I started working on it today....

    Basically I want to know if I fried this thing or if I can somehow save this and have one successful project...

    It can be powered via usb or a 9v DC connection. Both of those power inputs show signs of life and I wasn't sure what was going on at first until i heard a sizzling sound and I have yet to plug it in since.

    I am new to all of this and view it as a valuable skill and fun hobby, but today has been nothing but failure on all 3 of my soldering projects sadly. So please help if you can, though I think I fucked this poor guy up...
    Attached Files

    #2
    Re: Newbie potentially fried a circuit on AKAI MPK25

    I mistyped when I said I used a 9v DC, I used the correct voltage of a 6v DC. Just so everything is clear.

    Comment


      #3
      Re: Newbie potentially fried a circuit on AKAI MPK25

      It is best to perfect your soldering skills on on working boards that have been scraped.

      Comment


        #4
        Re: Newbie potentially fried a circuit on AKAI MPK25

        clean Q2 and C5 and get better foto's

        Comment


          #5
          Re: Newbie potentially fried a circuit on AKAI MPK25

          Originally posted by keeney123 View Post
          It is best to perfect your soldering skills on on working boards that have been scraped.
          well i suppose i am creating those scraped boards. home grown

          Originally posted by stj View Post
          clean Q2 and C5 and get better foto's
          will do.

          thanks
          -cart

          Comment


            #6
            Re: Newbie potentially fried a circuit on AKAI MPK25

            Originally posted by stj View Post
            clean Q2 and C5 and get better foto's
            Photos attached.

            Am I missing a pad?
            Do Q2 and C5 still look damaged?

            Thank you for any assistance.

            -Cart
            Attached Files

            Comment


              #7
              Re: Newbie potentially fried a circuit on AKAI MPK25

              the original foto's made them look burned!

              Comment


                #8
                Re: Newbie potentially fried a circuit on AKAI MPK25

                Originally posted by stj View Post
                the original foto's made them look burned!
                something was wrong with them, and the solder was crispy. but i scrubbed them down with rubbing alc and they cleaned up nicely enough and the ICs seem undamaged. so that's good.

                question: That stuffed that looked burned was what was "sizzling" when i powered it on using either the usb or the 6v DC connection. should i attempt to power it on with the 6v DC connection to test that this can power on normally even if not by using the USB which was obviously my intent of this project? doesn't seem like i can do any further damage using the DC right now.

                q2: how do i deal with that missing pad so that i can do the original repair of adding a working usb connector?

                thank you for any assistance

                -Cart
                Last edited by cart; 03-19-2016, 12:20 PM.

                Comment


                  #9
                  Re: Newbie potentially fried a circuit on AKAI MPK25

                  The USB and DC power it up just fine and the usb won't be moving around anytime soon. Powered on via USB all night with various settings that would inform me if it shut down at all and it went just fine. It is fixed for all intensive purposes, and learned a lot along the way and still have a lot to learn ahead of me. The missing pad is a mounting pad and it is in their pretty firmly.
                  Wish I started this hobby/skill years ago.

                  These skills will certainly pay for themselves even if I just repair my own gear. One fixed laptop or DC connection and I've saved myself at minimum a $100 repair bill.

                  Great skills to have during this day and age.

                  Thanks again.
                  Attached Files

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