Announcement

Collapse
No announcement yet.

DCM42 LA-F035P 800miliamp to 29 no display

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    DCM42 LA-F035P 800miliamp to 29 no display

    Hi I having a hardtime figuring out what type of resistor that this might be, I accidentaly knock off the smd resistor after trying to flash the bios chip, after putting 1k and 10k value resistor it has keep restarting




    The UU2 is labeled 5BA16


    Hope someone can also tell what is the use of the UU2 chip

    #2
    Re: DCM42 LA-F035P 800miliamp to 29 no display

    hi. see attached.

    Appears to be the Torex XC6127 Reset supervisor.
    Attached Files

    Comment


      #3
      Re: DCM42 LA-F035P 800miliamp to 29 no display

      Originally posted by mon2 View Post
      hi. see attached.

      Appears to be the Torex XC6127 Reset supervisor.
      can you guess what value it might be the risistor?

      Comment


        #4
        Re: DCM42 LA-F035P 800miliamp to 29 no display

        Can you post the voltage on the other side of the resistor?

        Is it +3v3?

        If my assumption is correct and this device is the reset supervisor then the "5" denotes a cmos device output which means it is push-pull style. That is, pin #4 will be low during reset and high when normal.

        This also means the resistor is technically not required for cmos style of this part.

        However, often pcb designers will allow for also the use of the open drain style of the supervisor. For the "6" style part, an external pull-up is required. The datasheet recommends 100k.

        In summary, the external resistor is not needed for the "5" version of this part but does not hurt the operation. It is required for the "6" version of the same part.

        The value is not critical but 100k is recommended.

        Confirm the resistor goes to the +3v3 rail.

        Comment


          #5
          Re: DCM42 LA-F035P 800miliamp to 29 no display

          Originally posted by mon2 View Post
          Can you post the voltage on the other side of the resistor?

          Is it +3v3?

          If my assumption is correct and this device is the reset supervisor then the "5" denotes a cmos device output which means it is push-pull style. That is, pin #4 will be low during reset and high when normal.

          This also means the resistor is technically not required for cmos style of this part.

          However, often pcb designers will allow for also the use of the open drain style of the supervisor. For the "6" style part, an external pull-up is required. The datasheet recommends 100k.

          In summary, the external resistor is not needed for the "5" version of this part but does not hurt the operation. It is required for the "6" version of the same part.

          The value is not critical but 100k is recommended.

          Confirm the resistor goes to the +3v3 rail.
          I test the voltage the LEFT SIDE 0V the RIGHT SIDE 5.2v if powered on if not powered no voltages on all sides

          Comment


            #6
            Re: DCM42 LA-F035P 800miliamp to 29 no display

            Post all voltages on the actual reset supervisor IC.

            Comment


              #7
              Re: DCM42 LA-F035P 800miliamp to 29 no display

              Originally posted by mon2 View Post
              Post all voltages on the actual reset supervisor IC.
              power of state
              PIN 3 - has 3.7v
              all other pins are 0v

              power on state
              PIN 3 - has 3.7v
              all other pins are 0v

              Comment


                #8
                Re: DCM42 LA-F035P 800miliamp to 29 no display

                Can you confirm with the attached drawing that you measured pin #3 ?

                If yes, then I am afraid my guess is not correct for the pinout. Perhaps you can trace the pcb layout to see where the pins go on this part.

                According to the drawing, pin #3 is a NC ( no connection ) pin.
                Attached Files

                Comment


                  #9
                  Re: DCM42 LA-F035P 800miliamp to 29 no display

                  Originally posted by mon2 View Post
                  Can you confirm with the attached drawing that you measured pin #3 ?

                  If yes, then I am afraid my guess is not correct for the pinout. Perhaps you can trace the pcb layout to see where the pins go on this part.

                  According to the drawing, pin #3 is a NC ( no connection ) pin.
                  Im very confident that it was pin 3 that has voltage reading only. I also use my oscilloscope to test the voltage of the pins

                  Comment

                  Working...
                  X