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  1. brunomotter

    820-3115 Quarter Fan Spin

    I ultrasonic cleaned the board and it worked again! Probably corrosion under a big chip. Thanks for the help!
  2. brunomotter

    820-3115 Quarter Fan Spin

    Machine does not start in SMC bypass. R7402/03 ok. Flashed BIOS, same. Verified all termination resistors and all read OK.
  3. brunomotter

    820-3115 Quarter Fan Spin

    Hello guys. Got an 820-3115 with quarter fan here. As I'm not familiar with this symptom I'm stuck. Got steady PPBUS_G3H, steady PP3V42_G3H, pulsing DDR Voltage and pulsing PCH VCORE, no pulsing on CPU VCORE though. Replaced RTC chip just in case, still same. Steady 3.3V on PPVRTC. There was a...
  4. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Yes, same shit... No light, 1.1V on SMC RESET
  5. brunomotter

    820-00165 Corrosion Near U3710 No Power

    And... Suddenly it stopped again! Same low reading on SMC_RESET_L, no light no charger
  6. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Well, I gave U5110 area some heat and now the board started giving SMC_RESET_L signal 3.4V. Now the board is entering S3 state. I have all power rails in sequence up to PP1V05_SUS.
  7. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Yes, I meant Pin 5, was a mistype. Light is amber, but even without battery, normal behavior should be green light fir a couple of seconds then amber. Mine gets only amber and SMC_RESET_L is still under 1V. Yes, genuine MagSafe 2 85W charger.
  8. brunomotter

    820-00165 Corrosion Near U3710 No Power

    I replaced U7100, short gone and now I get orange light on charger(no green light though), but SMC_RESET_L still low near 0.9V
  9. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Apparently, Pin 8 shorted to GND
  10. brunomotter

    820-00165 Corrosion Near U3710 No Power

    U5110: Pin 1 - 3.42V Pin 2 - 0V Pin 3 - 3.4V Pin 4 - 2.77V Pin 5 - 0V Pin 6 - 3.42V Pin 7 - 3.4V Pin 8 - 3.4V Diode: Pin 5 - 0.003 Pin 8 - 0.523
  11. brunomotter

    820-00165 Corrosion Near U3710 No Power

    U5110: Pin 1 - 3.42V Pin 2 - 0V Pin 3 - 3.4V Pin 4 - 2.77V Pin 5 - 0V Pin 6 - 3.42V Pin 7 - 3.4V Pin 8 - 0V
  12. brunomotter

    Does Anyone Have A 820-3637 Board to Measure 2 Resistors For Me?

    Hello guys. Anyone got an 820-3637 Mac Pro TrashCan board to measure 2 resistors for me? I need to replace them as they got heavily corroded and I could not measure them. If so, I can sen a picture from what I need!
  13. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Replaced the resistor and recalled SMC. Same thing. I had already tried replacing the SMC before but same results.
  14. brunomotter

    820-00165 Corrosion Near U3710 No Power

    It's out the case. Nothing but IO board and cable connected. Removed U5110 and still Low SMC_RESET_L, around 1,1V and going down up to 0.5V
  15. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Removed R7100 and J6100. Still same
  16. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Correct me if I'm wrong, but by what I understood of what you told I should remove U7100 and plug in the board? Would't that fry the board because the lack of PWM control?
  17. brunomotter

    820-00165 Corrosion Near U3710 No Power

    R5100@100K 3V42 = 3.42V Stable PPBUS_G3H = 8.16V stable
  18. brunomotter

    820-00165 Corrosion Near U3710 No Power

    Replaced U5110 and now I get around 0.5V on SMC_RESET_L
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