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macbook pro 820-3437

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    macbook pro 820-3437

    I have a problem with an 820-3437 the pp5v_s4rs3 signal varies between 5v and 0v, it is not stable in the same integrated system, it generates pp3v3_s5_reg_r of 3v3 that if they are stable with what the computer does not start the fan is seen to rotate a little and it stops. Green light that turns to orange making measurements I see that q8150 does not have 4 ALL SYS PWRGD in its output due to the instability of PP5V S0 while medium voltages I saw that the measurement of leg 5 saw how the tension was fructifying and in a method it is set to 0.67 V and the fan begins to rotate faster and faster and by measuring I see that the 5V voltage of pp5v_s4rs3 has stabilized and I have tension in the memory and cpu coils I do not know why this occurs
    I hope your help thanks.
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    Last edited by mortito; 05-26-2021, 03:15 AM.

    #2
    Re: macbook pro 820-3437

    also check the current sensing resistors value at ISL6259

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      #3
      Re: macbook pro 820-3437

      thank you very much i will try them

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