Help identifying power ic?

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  • berthfield
    New Member
    • Mar 2016
    • 7
    • Jamaica
    #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
    • R_J
      Badcaps Legend
      • Jun 2012
      • 9535
      • Canada
      #2
      Re: Help identifying power ic?

      I can't see anything but an [X]

        Comment

        • PeteS in CA
          Badcaps Legend
          • Aug 2005
          • 3579
          • USA, Unsure of Planet
          #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

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #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

                • Per Hansson
                  Super Moderator
                  • Jul 2005
                  • 5895
                  • Sweden
                  #5
                  Re: Help identifying power ic?

                  Originally posted by PeteS in CA
                  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

                    • berthfield
                      New Member
                      • Mar 2016
                      • 7
                      • Jamaica
                      #6
                      Re: Help identifying power ic?

                      Originally posted by PeteS in CA
                      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.

                        Comment

                        • Amraks
                          Badcaps Veteran
                          • Nov 2011
                          • 725
                          • Australia
                          #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.

                            Comment

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