Dell 15-3542 MB: 13269-1 Strange LDO

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  • javieromex
    Senior Member
    • Apr 2016
    • 78
    • México
    #1

    Dell 15-3542 MB: 13269-1 Strange LDO

    Hello, I received this laptop with no power issue.

    Originally short on mosfets of 1D05V_PWR

    after removing mosfets I do not get the 3V LDO from TPS51225R(PU4502 3V/5V IC) (see on the attached image what I get in blue).

    I have replaced 2 times the TPS and same issue, the 19V line from the charger is steady, my undestand is that the TPS only needs the 19V to provide the LDO but I get that noisy voltage.

    I have cut the LDO trace coming out the TPS and same issue measuginr on the IC.

    Any help?

    thanks
    ​
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    • piernov
      Super Moderator
      • Jan 2016
      • 4437
      • France
      #2
      Output capacitor is required for the LDO to work properly.
      Regardless, if there was a problem both on 3V LDO and 1.05V rails, PCH is probably damaged.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

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