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Burned track from a notebook's mother, tin enough or should I add wire?

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    #1

    Burned track from a notebook's mother, tin enough or should I add wire?

    Hi, I have a notebook that doesn't want to turn on. At first it showed some signs it made me think it was a bad capacitor. I was wrong. There is a small track that blew, it's attached to a tiny transistor I think. On top of it there are only two letters: OP. I thought it was a bad cap because it turned on for a few seconds every day, but that was due to the carbonization, it completed the circuit untill it got hot...

    I think it is just the track that has gone bad. So my plan is to solder it back. I'm pretty sure I can solder it with just tin and flux. But, given that the copper track blew, I don't know if the tin alone will withstand the current / temperature.

    Do you guys think I just use tin to fill the 2 mm gap? Or should I try to solder a small piece of wire / cable to complete the track? (i think i will need some assistance or a better helping hands for the latter...) Also I was thinking it would be easier to re-solder it if I could strip a larger part of the track, but as it is so small I'm scared on breaking it. Any ideas on a safe stripping method? (like using nail polisher or some chemical to dissolve the enamel (if that is what is covering the track))

    Also any chance to identify the part? I was thinking to test it if it was a transistor, but I'm not sure. I couldn't find a diagram for this particular motherboard. The notebook is a sony vaio vpcz130gl btw. The eight white and red cables come directly from the psu.

    I usually just try, but this is the smallest part I've ever had to fix. I couldn't actually measure it, but it is a bit smaller than the common small resistors. I'm scared. I'll probably wait a few days to gain enough courage and patience to do it.

    Thanks in advance!
    Attached Files
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    #2
    Re: Burned track from a notebook's mother, tin enough or should I add wire?

    Definitely use some wire. I usually use a cut off capacitor lead (no shortage of those )
    I either scrape off some of the solder mask with an xacto knife, or I'll run a wire between 2 other components on either side of the break if they exist.
    Last edited by smason; 01-16-2013, 10:43 PM.
    36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

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      #3
      Re: Burned track from a notebook's mother, tin enough or should I add wire?

      Originally posted by smason View Post
      Definitely use some wire. I usually use a cut off capacitor lead (no shortage of those )
      I either scrape off some of the solder mask with an xacto knife, or I'll run a wire between 2 other components on either side of the break if they exist.
      A cut off capacitor lead would be easier to place than wire, its a nice idea, i just need to get one big enough to go from the track to the component and cut it

      I guess I'm gonna have to scrape it, the other end of the track goes under a component and I can't hook the other side of the wire there.

      Thanks!

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        #4
        Re: Burned track from a notebook's mother, tin enough or should I add wire?

        Cant just tell what you mean - is it just the grey area between the two six legged components. Was it just board trace or are you asking what component was on it?

        On the six legged component there is something very very small underneath
        the "OP" can you see what it is - is it a phillips logo?
        I am only guessing but as the other six legged component has DQ on it I believe that the one you say has OP on it may have DP on it.

        If you look on this page
        http://iwenzo.de/wiki/SMD_Transistor...n_Code_Liste_1
        There are items listed DP and DQ they are six legged so perhaps that is what they are?
        Please upload pictures using attachment function when ask for help on the repair
        http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

          #5
          Re: Burned track from a notebook's mother, tin enough or should I add wire?

          Originally posted by selldoor View Post
          Cant just tell what you mean - is it just the grey area between the two six legged components. Was it just board trace or are you asking what component was on it?

          On the six legged component there is something very very small underneath
          the "OP" can you see what it is - is it a phillips logo?
          I am only guessing but as the other six legged component has DQ on it I believe that the one you say has OP on it may have DP on it.

          If you look on this page
          http://iwenzo.de/wiki/SMD_Transistor...n_Code_Liste_1
          There are items listed DP and DQ they are six legged so perhaps that is what they are?
          No, it's three legged, it may say DP, it is not easy to read it. I think it was just the board trace, I have not fix it yet, but I would like to know what component is on it as well. I attach an edited picture marking the component to be clear which one it is. It is on top of another identical one that says MU or MV, I'm not quite sure.

          I've just tried to read on the six legged component that says VD, but as far as my eyes, my helping hands lens and my camera can tell it is just a dot, i wished i bought that usb microscope a month ago...

          I've checked the page, it doesn't resemblance to any one that says dp in shape. Though they are all npn transistors, and given the track attached to it blew it could very well be one. If I could identify the collector, emiter and base I could test if it is still working with a multimeter.
          Attached Files

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            #6
            Re: Burned track from a notebook's mother, tin enough or should I add wire?

            Sorry, I was looking at much larger components on another part of your picture.

            Looking at this page

            http://iwenzo.de/wiki/SMD_Transistor...n_Code_Liste_D

            DP could be a switching diode?

            perhaps like this

            http://html.alldatasheet.com/html-pd...MBD2000T1.html
            Last edited by selldoor; 01-17-2013, 05:16 PM.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

              #7
              Re: Burned track from a notebook's mother, tin enough or should I add wire?

              It definately looks like the ones you mention. Thanks! I can just do a diode test then

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                #8
                Re: Burned track from a notebook's mother, tin enough or should I add wire?

                Well I couldn't make it completely pass the diode test, but I don't think I can make a great contact with the multimeter ends, i do get to transfer a bit of current from pins 1 and 2 to pin 3, so I'll assume it is working, thanks again for the help identifying the part!

                Btw I looked for switching diodes on the market in case of the worst, I'm glad I don't have to order them, minimum quantity I found was 100 for diodes of that size, and that was just for a particular switching diode, others where arround 3000...

                Comment

                  #9
                  Re: Burned track from a notebook's mother, tin enough or should I add wire?

                  Scrape off the trace and tin it, just make sure is thick enough and don't forget to add some solder mask paint if you have any. Also get one of these it will help you identify components like that.
                  http://www.ebay.com/itm/NEWEST-Trans...item35c04c41d5
                  Last edited by opamp; 01-18-2013, 02:14 PM.

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