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Acer V5-132P 3D3v_PWR Shorted to ground

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    #1

    Acer V5-132P 3D3v_PWR Shorted to ground

    I'm troubleshooting a laptop motherboard Acer V5-139P, 3D3V_PWR is shorted to ground, at first I thought PT4101 or PU4104 is short I remove those two parts but still got 3D3V_PWR shorted to ground, I remove the coil PL4101 to check some shorted pads, but nothing. It seems the short is after PL4101, I check PU4101, 3.3v and 5v are present. It seems a dead end to me I will not jump to a conclusion for a shorted CPU. Any help is very much appreciated. Thank you very much.
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    #2
    Re: Acer V5-139P 3D3v_PWR Shorted to ground

    any sign of water damage on any IC?
    If no symptom, while the 3.3v coil is removed, inject voltage at the shorted line to see which IC gets warm. It may be SIO or PCH or a capacitor.
    Last edited by caspian; 08-06-2019, 03:31 PM.

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      #3
      Re: Acer V5-139P 3D3v_PWR Shorted to ground

      Is bios pin#8 shorted to gnd?? PCH power coil shorted to gnd??

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        #4
        Re: Acer V5-139P 3D3v_PWR Shorted to ground

        No water damage, I did not try voltage injection yet. mcplslg123... yes pin 8 of bios is also shorted to ground. I suspect the bios IC and remove it, still shorted. My last effort to do now is doing the voltage injection to see which parts get warm...

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          #5
          Re: Acer V5-139P 3D3v_PWR Shorted to ground

          Originally posted by benja1475 View Post
          No water damage, I did not try voltage injection yet. mcplslg123... yes pin 8 of bios is also shorted to ground. I suspect the bios IC and remove it, still shorted. My last effort to do now is doing the voltage injection to see which parts get warm...
          if 3.3v line for bios is short, you can connect 1v power supply and see which segment is warm .i thinks you have a short smd capacitor
          Last edited by kokono; 08-06-2019, 11:57 PM.

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            #6
            Re: Acer V5-139P 3D3v_PWR Shorted to ground

            Go with the suggestions of @kokono and@caspian. Your 3v line is shorted and it could be anything, shorted cap,pch etc.

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              #7
              Re: Acer V5-139P 3D3v_PWR Shorted to ground

              thank you guys... I will try it later.

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                #8
                Re: Acer V5-139P 3D3v_PWR Shorted to ground

                btw... I will correct the title of this post, its for the model Acer V5-132P not Acer V5-139P, sorry...

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