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Asus X571GT repair chip replace and tips wanted

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    #1

    Asus X571GT repair chip replace and tips wanted

    Hi

    I try to repair a asus Asus X571GT (DA0XKTMB8C0) no power no lights.
    I saw a burned (small hole in it) chip (JW10F) proberly a TPS22976DPUR, I removed it, now with power connected the laptop turns on and direct off again, power led and fn will light up.
    I found on a donor lenovo board a G2898KD1U (wa9y), looks the same ..
    Result is still the same, turns on and direct off again, first attempt is with backlight on all other direct attempts are only the power and fn led.

    Could it be the chip is to diffrent to make the laptop work again ?

    orginal chip: https://www.ti.com/lit/ds/symlink/tp...mouser.de%252F

    placed chip:
    https://www.scribd.com/document/6020...98KD1U-C356810

    Found boardview here: https://www.badcaps.net/forum/troubl...ardview-please


    No short found and power will appear for a sec on 1v 3.3v 5v and some 12,6v (after the 19v) but not verry stable.

    thanks
    Tags: None
    #2
    mon2 Can you help ?

    Comment

      #3
      Hi. Post a pic of the area of the board where this part lives.

      Yes, the TI and the other from GMT are the same. Have more faith on the TI brand over other replacements. Either way, these are slew rate controlled load switches to prevent in-rush currents from damaging downstream component.

      Remove all power. Meter in resistance mode. Measure the resistance to ground on each side of the load switch. Post the measurement.

      Share the reference on the PCB / silk screen markings so it can be located on the boardview diagram.

      Comment

        #4
        To be precise, measure resistance to GND on pin1-2/6-7/8-9/13-14 of this load switch. No power attached while measuring.Meter should be in 20K scale or higher.

        Comment

          #5
          I get on it asap, thx.

          Comment

            #6
            Thx guys, when doning the measurements I noticed that the chip was not make a 100% connection, I reflowed the chip and the laptop is turning on again !!

            Comment

              #7
              small update.
              Boots windows
              cpu fan always 100% does not detect rpm in bios
              nvidia adapter not present (reflashed nvidia bios,no diffrent)
              right usb and card reader does not reconise anything
              did get hot but after repaste ok

              but less dead then before

              Comment

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