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    #1

    Help identifying power ic?

    Good Day,

    I was recently presented with a inexpensive DVR that had a short in its power supply. After searching I was able to isolate the issue to the 5v rail, specifically a 6pin IC with the markings DDAAC. It seems to be some form of power ic or a buck converter or sorts.

    I have been searching but cant seem to find a way to identify these ICs, could you point me in the right direction please. Attached to this post is an image showing a similar circuit on the board that is unaffected.

    Thanks in advance.

    Attached Files
    Last edited by Per Hansson; 02-22-2019, 03:44 PM. Reason: Offsite image uploaded & link fixed
    Tags: None
    #2
    Re: Help identifying power ic?

    I can't see anything but an [X]

    Comment

      #3
      Re: Help identifying power ic?

      Either img tags are not working, or vBulletin is not recognizing the imgur page as an image, https://imgur.com/a/2oQ3LXE .

      I can't see clearly any IC such as berthfield described, but there is an electrolytic cap in the pic that clearly is swollen and vented.
      Last edited by PeteS in CA; 02-22-2019, 12:42 PM.
      PeteS in CA

      Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
      ****************************
      To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
      ****************************

      Comment

        #4
        Re: Help identifying power ic?

        U4 looks like a sot23-6 LDO, Maybe post the model number, maybe there is a schematic around

        Comment

          #5
          Re: Help identifying power ic?

          Originally posted by PeteS in CA View Post
          Either img tags are not working, or vBulletin is not recognizing the imgur page as an image, https://imgur.com/a/2oQ3LXE .
          Well, it's because it's a link to a webpage, not an image...
          I fixed the link now...
          "The one who says it cannot be done should never interrupt the one who is doing it."

          Comment

            #6
            Re: Help identifying power ic?

            Originally posted by PeteS in CA View Post
            Either img tags are not working, or vBulletin is not recognizing the imgur page as an image, https://imgur.com/a/2oQ3LXE .

            I can't see clearly any IC such as berthfield described, but there is an electrolytic cap in the pic that clearly is swollen and vented.
            I changed that cap after taking the picture. The IC turned out to be a LDO as suggested but after searching for a few hours I was unable to find any replacements locally. The only markings on it were DDAAC not sure what that was supposed to signify.

            Edit: Forgot to mention that in the interest of time I removed the offending component and just went with a 7805 mounted to the side for 5v supply. There aren't many SMD suppliers locally and I was not willing to wait.

            Thanks all for your help.
            Last edited by berthfield; 02-22-2019, 11:34 PM.

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              #7
              Re: Help identifying power ic?

              working on the same board at the moment.
              where U5 is fried no voltage for the mouse is the only issue.
              I am suspecting its the same as U4 at the moment can't tell as the top has been burnt off.
              Last edited by Amraks; 10-13-2019, 07:46 PM.

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