Identifying Component Help needed

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  • Giff1711
    Member
    • Mar 2012
    • 34
    • United Kingdom

    #1

    Identifying Component Help needed

    Hi
    Can anyone confirm for me that this is a power inductor ? It has the markings PF 7R0.
    (see pic) Its the one directly behind dc jack PF 7R0

    Whats baffling me is the markings. Shouldn't it have a rating in henrys not resistance ?
    The component had melted onto the board, So there was nothing left to identify the chip or test. I've managed to get a picture of the board [Fujitsu Siemens Amillo Pro LM7W+] with the chip needed.
    Any help identifying the chips role (ie resistor or inductor), rating and part number would be great
    thanks
    Dave
    Attached Files
  • selldoor
    Slow Learner
    • Dec 2010
    • 7870

    #2
    Re: Identifying Component Help needed

    Is there no Board marking for it L???
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Identifying Component Help needed

      The pictures are way out of focus, if you look at it side view, can you see wire wrapping around the body? It is more likely to be 7uH inductor.
      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

      • Giff1711
        Member
        • Mar 2012
        • 34
        • United Kingdom

        #4
        Re: Identifying Component Help needed

        The markings are worn off. From what i can make out ?13 the first letter could be a L13 which would make it an inductor right. But in that case shouldn't the chip markings be 7uH opposed to pf 7R0 ?
        If it is a inductor 7uH do you know of a part No or compatable one it has 4 contact pads & is about 3mm in size ?
        Any help would be great thanks
        Thanks Dave
        Last edited by Giff1711; 01-21-2013, 09:04 AM.

        Comment

        • Giff1711
          Member
          • Mar 2012
          • 34
          • United Kingdom

          #5
          Re: Identifying Component Help needed

          Sorry about pictures they were a picture of a picture which was taken with a low res camera tried to get as clear has possible.
          On my board the chip had destroyed its self so was only left with bits rattling around the case the rest was a blob melted to the board. I'm pretty sure there where bits of wire in the debrie though ? You could be right. I just don't get the markings (PF 7R0)
          If it is a inductor 7uH do you know of a part No or compatable one it has 4 contact pads & is about 3mm in size ?
          Any help would be great thanks

          Comment

          • vinceroger69
            Badcaps Legend
            • Mar 2012
            • 6714
            • uk

            #6
            Re: Identifying Component Help needed

            quite a common problem this may help identify it
            http://translate.google.co.uk/transl...ed=0CEEQ7gEwAg
            Last edited by vinceroger69; 01-21-2013, 11:40 AM.

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: Identifying Component Help needed

              So it is definitely an inductor and it is 7uh see attached

              The cooper-bussman states that the R is a decimal point

              I think othe examples only have two pad connectors

              There are lots of them 10mm square but struggling with 3mm or 4mm
              Attached Files
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • spidey
                climbs
                • Dec 2012
                • 644
                • Cyprus

                #8
                Re: Identifying Component Help needed

                on the pcb around the blown part, is there any other part, with marking and connected directly or after another component? in the schematic i have, there is no such component marking with PF 7R0.

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #9
                  Re: Identifying Component Help needed

                  might also be worth checking the capacitor mentioned in the link in case its short circuit? causing this inductor to fail.

                  Comment

                  • Giff1711
                    Member
                    • Mar 2012
                    • 34
                    • United Kingdom

                    #10
                    Re: Identifying Component Help needed

                    Originally posted by Giff1711
                    Hi
                    Can anyone confirm for me that this is a power inductor ? It has the markings PF 7R0.
                    (see pic) Its the one directly behind dc jack PF 7R0

                    Whats baffling me is the markings. Shouldn't it have a rating in henrys not resistance ?
                    The component had melted onto the board, So there was nothing left to identify the chip or test. I've managed to get a picture of the board [Fujitsu Siemens Amillo Pro LM7W+] with the chip needed.
                    Any help identifying the chips role (ie resistor or inductor), rating and part number would be great
                    thanks
                    Dave
                    Added better pic 3 you can see it needs 4 pads

                    Comment

                    • Giff1711
                      Member
                      • Mar 2012
                      • 34
                      • United Kingdom

                      #11
                      Re: Identifying Component Help needed

                      Originally posted by spidey
                      on the pcb around the blown part, is there any other part, with marking and connected directly or after another component? in the schematic i have, there is no such component marking with PF 7R0.
                      their ic LF-H80P-1 (check pic attached)
                      Attached Files

                      Comment

                      • Giff1711
                        Member
                        • Mar 2012
                        • 34
                        • United Kingdom

                        #12
                        Re: Identifying Component Help needed

                        Originally posted by selldoor
                        So it is definitely an inductor and it is 7uh see attached

                        The cooper-bussman states that the R is a decimal point

                        I think othe examples only have two pad connectors

                        There are lots of them 10mm square but struggling with 3mm or 4mm
                        Thanks its got to be 4pads (see pic )
                        Attached Files

                        Comment

                        • Giff1711
                          Member
                          • Mar 2012
                          • 34
                          • United Kingdom

                          #13
                          Re: Identifying Component Help needed

                          thanks this has been agreat help

                          Comment

                          • Giff1711
                            Member
                            • Mar 2012
                            • 34
                            • United Kingdom

                            #14
                            Re: Identifying Component Help needed

                            Originally posted by vinceroger69
                            quite a common problem this may help identify it
                            http://translate.google.co.uk/transl...ed=0CEEQ7gEwAg
                            thanks this has been agreat help

                            Comment

                            • Giff1711
                              Member
                              • Mar 2012
                              • 34
                              • United Kingdom

                              #15
                              Re: Identifying Component Help needed

                              Originally posted by vinceroger69
                              might also be worth checking the capacitor mentioned in the link in case its short circuit? causing this inductor to fail.
                              will do

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #16
                                Re: Identifying Component Help needed

                                ok I think it may have been a YM750635-3 made by Yosonic
                                see

                                page 107/8 No actual reference to YM750635-3 so it may have been a proprietary part made to order.

                                It is just a double coil choke so the laptop could be made to power simply by putting two links in.

                                As this part was burnt you should check that there is no short when testing the pads.

                                Still no joy in tracking a replacement.
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

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