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Need help identifying component FAAS2

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    Need help identifying component FAAS2

    hi. I'm trying to repair a Fluke VT02 thermal imaging scanner that the batteries were left in and corroded. I'm trying to identify a component that is labeled FAAS2 with underlined letters. I have no power to the unit so I'm starting from the power source and working my way backward.

    It's a SOT23 package with three through hole legs and is right after the fuses in the circuit. Is this a transistor or diode of some type? I don't have a schematic so I'm flying blind. The PCB is marked TR02. I am unable to locate any data on this component and I'm not sure what it does. I have not been able to locate anything through my usual sources. Any ideas?

    Thank you!

    #2
    Re: Need help identifying component FAAS2

    If you can post some pictures of the component and its location on the board, that might help to identify it.
    sot23 is a surface mount device. It might be a IRLML6401PbF mosfet ?
    Does it look similar to this ?
    Attached Files
    Last edited by R_J; 10-02-2020, 06:13 PM.

    Comment


      #3
      Re: Need help identifying component FAAS2

      OK. thanks. I have to take it apart again so I'll take some photos while I have it under the microscope again.

      Comment


        #4
        Re: Need help identifying component FAAS2

        Companies are having a hard time fitting their logo, a part number, and date/source code info onto beetle and ant droppings.
        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


          #5
          Re: Need help identifying component FAAS2

          OK. I got the Fluke back and took it apart again. The part is marked FAAS2 with underlined letters. The PCB indicates it as TR03. Here is an image of the part in question. Just want to see about replacing it but I can't figure out what it is. MOSFET?

          https://www.dropbox.com/sh/c2pnfqmn4...T9uDWloHa?dl=0[IMG]

          Comment


            #6
            Re: Need help identifying component FAAS2

            Can you use GO ADVANCED and attach good clear focused pictures of the whole board and in the area where this TR03 is located

            What Voltage testing have you done on the board and on each pin of that TR03?
            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


              #7
              Re: Need help identifying component FAAS2

              Thanks for the reply. I'm not familiar with GO ADVANCED. Is that a camera capture software? I do have a camera on my microscope but I have recently had to break everything down to evacuate due to hurricanes. Looking forward to putting my shop back together after the 4th time this year.

              I will check voltage on the 3 pins of the chip and post again.

              thanks

              Comment


                #8
                Re: Need help identifying component FAAS2

                Look at the bottom of this page. there is Post Quick Reply and Go Advanced, then click the paperclip next to the smiley face and attach your pictures and upload them.
                Make sure the picture is clear and IN FOCUS, if YOU can't read it we can't either
                Last edited by R_J; 10-10-2020, 06:55 PM.

                Comment


                  #9
                  Re: Need help identifying component FAAS2

                  Attached is a photo of the PCB and component location circled in red. It is in series right after the "fuse" from what I can tell. 3.3v comes from the battery source to the J connector. I will post voltage measurements shortly.
                  Attached Files

                  Comment


                    #10
                    Re: Need help identifying component FAAS2

                    is there only one on the board??

                    because if there is another then an option is to lift it and put it in a component tester to see what it is.

                    Comment


                      #11
                      Re: Need help identifying component FAAS2

                      Here's a better photo of the PCB and the component in question. The unit is powered by (4) AAA batteries. I have 6v at the J connector & both sides of the fuse. I have 6v at the top pin, 0v on the lower left pin & 6v on the lower right pin.
                      Attached Files

                      Comment


                        #12
                        Re: Need help identifying component FAAS2

                        Yes, there is only one on the board. I'm just trying to identify the part so I can try to find a replacement to swap out.

                        Comment


                          #13
                          Re: Need help identifying component FAAS2

                          From the looks of the layout, That looks to be P-CH MOSFET, the Drain pin is connected to the fuse which is fed by the 6V source, the Source pin is the Output which you do have 6V.

                          See if the Voltage on the Gate pin toggle between 0V and 6v or so when power switch is toggle.
                          You can also check the Voltages on the caps on the board to see if they have Voltages on them.
                          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

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