Announcement

Collapse
No announcement yet.

HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

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

    HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

    I traced what the fault of the motherboard could be and discovered that PU3 got hot (see attached schematic) when the power button was pressed. Boardview can be of immense help. I appreciate all candid assistance.
    Attached Files

    #2
    Re: HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

    If Pu3 get hot then you must check if it outputs are not shorted ld03 , ld05

    Comment


      #3
      Re: HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

      @Stevedb; I found 4.8v on presumably LDO5 or LDO3 because I don't know how find the exact pin numbers. Also, somewhere on one of the PU3 pins, I measured 3.2v. What can I suspect?

      Comment


        #4
        Re: HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

        Originally posted by vettouch View Post
        @Stevedb; I found 4.8v on presumably LDO5 or LDO3 because I don't know how find the exact pin numbers. Also, somewhere on one of the PU3 pins, I measured 3.2v. What can I suspect?
        The PU3 chip will have a dot in one corner,that means pin 1 starts there. Count the pins counter clockwise

        Datasheet https://cdn.badcaps-static.com/pdfs/...f508d059dc.pdf
        Attached Files
        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment


          #5
          Re: HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

          Originally posted by vettouch View Post
          @Stevedb; I found 4.8v on presumably LDO5 or LDO3 because I don't know how find the exact pin numbers. Also, somewhere on one of the PU3 pins, I measured 3.2v. What can I suspect?
          You will see a dot on the chip. keep that dot on left bottom corner. then pins starting from that dot. left to right.

          Here I attached the order.

          Comment


            #6
            Re: HELP: Dell Latitude D620 Compal LA-2791 Rev 1.0 UMA not powering

            @SMDFlea & @harshana: I could not find any dot on the PU3. Instead, I discovered that there was a dot on the board signifying pin 1. In the course of my investigations on PU3, pins 7, 9 and few others before pin 14 shorted to ground. I also discovered that on the pins configuration image sent by SMDFlea, GND is on pin 23. I'm confused, someone please help me!

            Comment

            Working...
            X