Lenovo Ideapad 3-15ITL6 NM-D471 NO POWER

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  • Dana24
    Member
    • Jan 2022
    • 18
    • Netherlands
    #1

    Lenovo Ideapad 3-15ITL6 NM-D471 NO POWER

    Laptop is not turning on or any led is showing.
    PU5601 is getting untouchably hot changed it but still getting hot and no sign of live? what should i do next?
    PC5611 was also shorted changed the cap and the short was gone, but still no 3.3V on the cap wich should receive from the PU5601.
    PU5601 = SY8386BRHC_QFN16_2P5X2P5

    Schematic: https://www.badcaps.net/forum/showth...55#post1205455
    Last edited by Vesko356; 05-02-2023, 01:40 PM. Reason: Added link to the schematic.
    Tags: None
    • mcplslg123
      Badcaps Legend
      • Jun 2015
      • 7262
      • india
      #2
      Re: Lenovo Ideapad 3-15ITL6 NM-D471 NO POWER

      PC5611 is a cap on +3V LDO. What is the resistance to GND on PC5611,pin1? Resistance should be measured without any power source .

        Comment

        • Dana24
          Member
          • Jan 2022
          • 18
          • Netherlands
          #3
          Re: Lenovo Ideapad 3-15ITL6 NM-D471 NO POWER

          I did somefurther diagnostics and think its IO chip. Ordered one when i receive it i will update this post.

            Comment

            • Windows8RTMUser
              Member
              • Sep 2018
              • 16
              • Philippines
              #4
              Having the same issue with an NM-D472, led blinks for 12 times and occasionally when it stops blinking and pressing the power button 3v_alw becomes .8v while the enable pin for pu5601 is pulled low, pu5601 also gets hot because something is drawing too much current from 3VLP, so far I have replaced super io/ec and lv5116a and it has made no difference, I'm starting to think its a dead CPU/PCH but it seems to properly load the new ec firmware onto a blank ec, disconnecting 3v pch with a blank chip it doesn't program a blank ec

              3vlp is 130k ohm
              3v_alw is 9.2k ohm

              Bypassing the ldo and using a bench psu it draws 160ma from 3vlp when in the state that makes pu5601 hot

                Comment

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