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Mini split PFC baord repair assistance.

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    #1

    Mini split PFC baord repair assistance.

    Hello! I just acquired a new project! It is a Grunair mini split(off brand junk)
    I was hoping that i can get the board repaired.
    So far i have taken photos of and identified two burned parts.
    They are as follows
    https://www.digikey.com/product-deta...23-5-ND/865299
    http://www.digikey.com/product-detai...F%29-ND/871322
    My plan is too replace these two parts as well as test the three large caps on the board. I was wondering if anyone had any advice on whether i should replace anything else? (or how to test them.)
    No burn marks or anything obvious on the other board.
    Here is the manual
    http://www.digikey.com/product-detai...F%29-ND/871322
    Here are the photos.
    http://imgur.com/yUVnOEx,BY7Powa,TN03yEO,UhN23OB
    there are four images in this link, you can cycle through them at the top.



    Thanks,
    Milkman
    Tags: None
    #2
    Re: Mini split PFC baord repair assistance.

    on photo 1 there is another burnt component to the left of the white square part is a black cylinder with 3 prongs. It is burnt up. Cant identify it.

    Comment

      #3
      Re: Mini split PFC baord repair assistance.

      That 3-leg device can be either Transistor or more likely to Programmable shunt regulator IC such as xx431.


      There should be printing on the flat side of the body.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

      Comment

        #4
        Re: Mini split PFC baord repair assistance.

        Originally posted by budm View Post
        That 3-leg device can be either Transistor or more likely to Programmable shunt regulator IC such as xx431.


        There should be printing on the flat side of the body.
        i found out it was a transistor(first in circuit Q1)

        I attempted to de-solder it. ended up breaking it!! The face reads br9013 h r07t
        Last edited by milkman6453; 08-15-2015, 12:32 PM.

        Comment

          #5
          Re: Mini split PFC baord repair assistance.

          ive got the other components out and the transistors legs without damaging the board. Im going to wait a bit for more input until i make the purchase on new components.

          Im still not sure what transistor to buy, any help is greatly appreciated!!

          this is the closest info on the transistor i can find
          http://www.datasheetcatalog.com/data...1/3/9013.shtml
          Last edited by milkman6453; 08-15-2015, 01:19 PM.

          Comment

            #6
            Re: Mini split PFC baord repair assistance.

            do you have to use image hosting para-sites!

            upload the image here.
            also, give full details of what it's from - maybe a schematic exists.

            Comment

              #7
              Re: Mini split PFC baord repair assistance.

              the schematic is in the manual on page 13/14 so is the model number of the mini split..

              Unfortunately i couldn't upload my images here as they were WAY to big and good quality. Thats why i used imgur, which is a fairly respectable site.

              Comment

                #8
                Re: Mini split PFC baord repair assistance.

                here are the photos on badcaps!
                Attached Files

                Comment

                  #9
                  Re: Mini split PFC baord repair assistance.

                  also the reason i think it blew is a lizard was on the "IC OFFLINE SWIT" part. http://www.digikey.com/scripts/DkSea...52480985888806

                  I cant see any fuses so it might have just blown other stuff up.

                  Comment

                    #10
                    Re: Mini split PFC baord repair assistance.

                    in that first foto, the track on the smd resistor R106 is missing!!!

                    Comment

                      #11
                      Re: Mini split PFC baord repair assistance.

                      here is a picture of the rear of that track.
                      Attached Files

                      Comment

                        #12
                        Re: Mini split PFC baord repair assistance.

                        not the blue bit, the red bit!
                        Attached Files

                        Comment

                          #13
                          Re: Mini split PFC baord repair assistance.

                          Ah! i see that, perhaps this board is for more than one unit. This model has units that can run 1 2 3 or 4 heads. Perhaps the boards were roughly the same minus some small stuff like that? or bad QA?

                          Comment

                            #14
                            Re: Mini split PFC baord repair assistance.

                            looks removed to me!

                            Comment

                              #15
                              Re: Mini split PFC baord repair assistance.

                              how do i go about repairing it? Would a small electrical fire/explosion tear it off? Thats what happened on the top of the board and by the transistor i removed.

                              Comment

                                #16
                                Re: Mini split PFC baord repair assistance.

                                https://www.acwholesalers.com/Grunai...HXB-3/34381.ac

                                that is the best photo i can find of a "new" board.

                                The only differenc ei can see is the large caps on this one are silver on the bottom/top.
                                Last edited by milkman6453; 08-15-2015, 08:18 PM.

                                Comment

                                  #17
                                  Re: Mini split PFC baord repair assistance.

                                  If you check the 2nd photo in badcaps, resistors R20 and R40 look like there is a bit missing on top. Check those as well for correct resistance.
                                  Also above R20 and on R21 label is there a cut on the track or just dirt?

                                  Comment

                                    #18
                                    Re: Mini split PFC baord repair assistance.

                                    the material on the resistors came off revealing the numbers beneath.

                                    Attempted checking resistance, failed. I assume i have to remove from circuit.

                                    Thank you for your input!!

                                    Comment

                                      #19
                                      Re: Mini split PFC baord repair assistance.

                                      If you cannot measure any resistance on circuit, then they are definitely open. Usually material breaks due to temperature when they burn..

                                      Comment

                                        #20
                                        Re: Mini split PFC baord repair assistance.

                                        I haven't removed them yet.

                                        Although, there was a laminate type material over the resister pads. I scrapped them up a little and now can get a in circuit reading on each of them

                                        Comment

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