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Power-cycling 820-3332

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  • Power-cycling 820-3332

    This was submitted as a liquid-damaged board although I'm not seeing any signs of it. I've attached pre-cleaning pics. It's cycling 5V_S4 along with 5V_S0, ALL_SYS_PWRGD and every other voltage I can think to measure every few seconds. Nothing on Vcore. Vcore is measuring a short of 0.001 (1.1Ω) Is it more hopeful with a Vcore short if PPVIN_S5_HS_COMPUTING_ISNS wasn't shorted? (so the CPU didn't necessarily get hit with 12V) Either way, any tips for how to progress with this?

  • #2
    Vcore resistance is pretty low on these boards so that seems ok.
    If ALL_SYS is pulsing too and Vcore is not doing anything I can already tell you this one will suck. Did you check around U7400, R7402/03?

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    • #3
      U7400 is getting power. The area is completely clean. Do you know what voltage I should be getting on pin 1 of R7402 and R7403?

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      • #4
        Can't say unless the system was working. Measure the actual value and inspect for corrosion.
        Power cycling can be anything, from crap under chips to one small knocked off resistor....

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