g86-703-a2 pinout needed

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  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3575
    • slovakia

    #1

    g86-703-a2 pinout needed

    I desoldered this chip because have short on 1.2v and 3v rails. Need to check this short to check if is chip ok or is fried. Did anybody know what pins to check?
  • loser18
    Badcaps Veteran
    • Nov 2013
    • 274
    • UK

    #2
    Re: g86-703-a2 pinout needed

    As far as I know...There's no way to check if the chip is bad...Heard if you check resistance across all caps on the chip & don't have resistance, it's fried(of course after desoldered & cleaned)...
    But not sure...

    Comment

    • dellxps15
      Badcaps Legend
      • Feb 2014
      • 1588
      • italy

      #3
      Re: g86-703-a2 pinout needed

      on vga mxm you have 4 coil named L1 L2 L3 L4 ,first check if any of them is shorted.
      L4 is for: FBVDDQ SWITCHER POWER SUPPLY
      L1 L2 L3 are for NVVDD SWITCHER POWER SUPPLY

      on fpa there are many pin to check:
      i have a G86 schematic p419 (should be g86-630-a2)

      FB_VTT W19
      FB_VTT U19
      FB_VTT R19
      FB_VTT N19
      FB_VTT L19
      FB_VTT J18
      FB_VTT J17
      FB_VTT F16
      FB_VTT F15

      FB_VDDQ Y22
      FB_VDDQ U22
      FB_VDDQ P22
      FB_VDDQ L22
      FB_VDDQ J22
      FB_VDDQ T19
      FB_VDDQ M19
      FB_VDDQ J19
      FB_VDDQ F19

      also d15 get power.

      f13, h22 are ground
      Last edited by dellxps15; 05-19-2014, 08:45 AM.

      Comment

      • ktmmotocross
        Boardkiller
        • Feb 2014
        • 3575
        • slovakia

        #4
        Re: g86-703-a2 pinout needed

        guys, im wrote that chip is desoldered. i need to check resistance on 1,2v and 3v on the chip. im not familiar with finding the right pins right on the chip so help will be needed. maybe enybody have some picture of pinout with some legend to be sure

        Comment

        • dellxps15
          Badcaps Legend
          • Feb 2014
          • 1588
          • italy

          #5
          Re: g86-703-a2 pinout needed

          each bga start with a letter and number. fisrt ball is a1 , down there is b1, and so on. referring to your bga socket, i give you letter and number position of voltage and ground.

          (because bga is desoldered you have to look at that location inverted.

          like in the picture, but for bga they are inverted.http://4.bp.blogspot.com/_lAb8NkC80k...definition.jpg

          example: A1 is upper right, a30 is upper left. looking at removed bga.
          Attached Files
          Last edited by dellxps15; 05-20-2014, 03:52 AM.

          Comment

          • ktmmotocross
            Boardkiller
            • Feb 2014
            • 3575
            • slovakia

            #6
            Re: g86-703-a2 pinout needed

            thats exactly what im looking for.

            Big thanks.

            Comment

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