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820-3437-B no power, no green light

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  • #16
    There are many more reistors then just those two, check the data lines pin 1,2,5,6. 12 resistors in total in those data lines to CPU and SMC.

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    • #17
      Checled all. Every one seems okay except:
      R2013 is 70k instead of 10k
      R1580 is 60k instead of 100k

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      • #18
        What do those resistors have to do with the SPI ROM?

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        • #19
          Sorry I guess I did not understand correctly what to check the first time. Those two resistors were connected to pin 8. of u6100
          Anyway I just checked all the rest of the SPI resistors. All of them are fine.

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          • #20
            So any further suggestion?

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            • #21
              How does pin 8 of U1950 look or the other pins?

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              • #22
                They look fine, no corrosion.

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                • #23
                  Out of ideas then, sorry. Must be corrosion somewhere, but yeah cannot diagnose that over the internet.

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