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    Lenovo g710 (dumb02)

    got a totally dead g710 uses Dumb02 motherboard.
    20 pic ic next to bios bat getting hot, no identification on ic, anybody got a service manual for this board, or know what the ic is marked in the picture.
    Thx
    Attached Files

    #2
    Re: Lenovo g710 (dumb02)

    Well I Have the same failure the only thing I could read from the chip with the microscope was 1225 and I'm still searching for schematic diagram.
    I'll keep you posted on the discoveries

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      #3
      Re: Lenovo g710 (dumb02)

      With a litle research on the net it is a buck controler step down voltage regulator Texas instruments TI51225.

      Comment


        #4
        Re: Lenovo g710 (dumb02)

        That is TPS51225. Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs.

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          #5
          Re: Lenovo g710 (dumb02)

          Hi

          I just found this via google and this is the excact problem I have, so I had to register to replay on it. I have replaced the ti chip but still get hot and won't turn on. Has any of you succeded the repair ?

          thx!

          Jeroen

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            #6
            Re: Lenovo g710 (dumb02)

            if the ic is marked 20-xxxx then its not 51125 but 51123

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              #7
              Re: Lenovo g710 (dumb02)

              I have replaced the 51125 but issue is still the same, so problem is before or after the chip, I am not a skilled repair man so any hint or advise what to check would be helpfull. And a bit off luck offcource

              regards

              Comment


                #8
                Re: Lenovo g710 (dumb02)

                Check resistance to gnd for both 3v and 5v coils to begin with.

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                  #9
                  Re: Lenovo g710 (dumb02)

                  You must check pin3 (VREG(3.3-V LDO)) and pin 13 (VREG(5-V LDO)). Usually pin 3 is short circuited. TPS51225C - this is the chip ...

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                    #10
                    Re: Lenovo g710 (dumb02)

                    I faced the same problem today and solved the problem. First, the 3v coil was short circuited. I changed pch. The short circuit in the 3v coil was removed, but the 1225c integrated continued to heat and when I checked the 25q32fv bios chip, I saw it was short. After the io replacement, the computer started working normally. If anyone else encountering the same problem I hope this post helps.

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