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Type: Posts; User: sargfowler

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    Re: 820-00840 pulsing P3V3S5_EN

    Update:
    I've checked PP1V_S5G and this is shorted to ground.
    I'll inject some voltage and see what gets hot.
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    820-00840 pulsing P3V3S5_EN

    I've got this clean board which doesn't power on as PP3V3_S5 was pulsing.
    I've traced this to PP3V3S5_EN pulsing.

    So far I've got:

    PPBUS_G3H 13v
    Charger 20v 0.01A
    PP3V3_G3H 3.4v
    PP5V_S5...
  3. Re: Dell Alienware 15 R2 power supply shorts LA-C91

    I've got the schematics which helps a lot. Shame I don't have the board view, but most of the components are marked.
    I've injected a voltage onto the 19v rail, but its a dead short so I get a low...
  4. Re: 00165 - Trackpad works Keyboard doesn't

    Check the keyboard connector on the board with a microscope.
    Also check the ribbon cable from the board to the trackpad.
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    Re: 820-3115 smc_bc_acok is 0v

    It should be pulled up? Check R5087. You are getting PP3v3_S5?
    This is normally generated by U7000, but I see you've removed it.
    Bear in mind that this is also used on the onewire to get power from...
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    Re: 00163 No Backlight

    Stepping back a bit, what voltages are you getting from F7700, thru R7700, Q7706, L7710 and D7701?
  7. Dell Alienware 15 R2 power supply shorts LA-C91

    Got this Alienware that wouldn't power up, but now shorts the power supply and the blue light on the charger goes off with a crack noise.
    Obviously a short somewhere, it's not the internal charger...
  8. Re: 820-2610 runs on Lion but crashes on Mountain Lion

    This sounds very much like a graphics issue.
    If an EFI ASD passes, but the OS ASD fails to load, this usually indicates a graphics problem.

    There were changes to the way drivers were loaded in...
  9. Re: 820-00165 Bios with Clean ME region dump

    Try Ghostlyhaks
  10. Re: 820-2915 not charging, lagging, keyboard unresponsive

    Common problem for slow systems is a water damaged trackpad.
    Also try without the BIL connector.
    Can you run EFI ASD on the MacBook?
  11. Re: 820 - 2915 mystery to me - [ fan spin, video(backlight) but not posting/chiming ]

    I use a SkyPro programmer which works well with Windows and is pretty quick.
  12. Re: 820 - 2915 mystery to me - [ fan spin, video(backlight) but not posting/chiming ]

    Try flashing the SPI ROM with a new clean image as it looks like it is partially booting
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    Re: Macbook Air 2018 Parts Needed

    Yea, it's all a bit too new.
    I googled A1932 and got nothing at all came up.
  14. Re: 820-3330 Screen data image problem , Apple logo then dark grey screen

    Check SMC_LID signal
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    Re: 820-00875 USB not working

    The fact that neither port works would indicate it's not the CD3215A10 that's at fault.
    It must be something that is common to both ports.

    The other other thing I can think is to refresh the SPI...
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    Re: 820-00875 USB not working

    Have you tried a USB meter on the port? Just interested to see if the volts/amps look OK?
  17. Re: A1534 Macbook Retina 12" compatible keyboards

    Thanks for the suggestion, but not sure how to fix that. I'll try SMC reset again.

    If this doesn't work I'll sell this keyboard on and buy a 2015 model instead.
    The 2016/2017 appear to be black...
  18. A1534 Macbook Retina 12" compatible keyboards

    I've got a bad keyboard in a Macbook. As soon as it gets to the login screen, it shuts down.
    I believe it's the keyboard backlight. I've tried another keyboard and it works OK.

    So I've ordered a...
  19. Re: 820-3332 - Trolled by the SMC (PECI sensors jumping from 60 to 100 degrees Celsius in OS)

    I presume it works OK in bypass mode?
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    Re: 820-2936 no sound device

    Is everything else on the Macbook working OK?
    I've seen audio being dragged down by other things that have failed.
  21. Re: 820-00165 Pulsing 2 times, PPBUS_G3H dropping to 7V while pulsing

    The only other thing to try is a new, cleaned ROM file.
  22. Re: 820-00165 Pulsing 2 times, PPBUS_G3H dropping to 7V while pulsing

    U1930 will be sending the output high when ALL_SYS_PWRGD and S0 state are active. It should be 1.05v at least briefly?
    If you're getting CPU Vcore (when U1930 is removed) then at least you know this...
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    Re: MacBook Retina 12-inch 2015

    So not a high temp then! What voltages have you got just before it cuts out?
  24. Re: Need help with MagSafe2 60w MacBook pro charger

    Attach a repaired or new lead and read off the voltages on the pins of the magsafe connector.
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    Re: MacBook Retina 12-inch 2015

    I've only looked at one and it's still not completely working even after changing a few parts.
    What does istatmenus say about the voltages and temperatures before it restarts?
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