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820-3330-b no green light

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  • 820-3330-b no green light

    PPBUS is missing
    PP3V42_G3H is missing
    SMC_BC_ACOK is missing
    R7005 near ISL is dead. Should I change R7005 and ISL?

  • #2
    ISL will not work properly with missing R7005. Change the resistor first, verify there are no shorts and then make sure you have proper voltage on pin 2 and 3 of U7000 before replacing, unless of course U7000 is causing a short in which case you should just replace that as well.

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    • #3
      Uhm no! R7005 is dead because of a short in U7000. Always change them both. Also check R7021/22/51/52

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      • #4
        Changed R7005 and U7000.
        R7021/22/51/52 are fine.

        What changed: PP3V42_G3H is present this time. Still no green light, PPBUS or ACOK.
        ISL also gets pretty hot.

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        • #5
          Check your soldering job, also measure resistance from F7040 to GND and report value....

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          • #6
            If ISL gets hot it is either soldered wrong or it was killed.

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