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  1. #1
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    MBA A1466 fan spin but not chime and not video

    hi gays.....im working in a MacBook Air a1466 (820-3437) with water damage. im check all rails and all rails are present and corrects...the logic board turn on then turn off and then turn on, fan is spinning but not chime and not video...I need help for fix it.....thank you



    PPBUS_G3H: 8,58v
    PPBUS_S5_HS_COMPUTING__ISNS : 8,58v
    PPBUS_S5_HS_OTHER_ISNS: 8,58v
    PPDCIN_G3H_ISOL:15,05v
    PPDCIN_G3H: 15,05V
    PPVRTC_G3H: 3,32V
    PP3V42_G3H: 3,42V
    PP5V_S5: 5.13V
    PP5V_S4RS3:5,13
    PP5V_S0:5,1V


    PM_SLP_S4_L: 3,32V
    Last edited by Carlosqg76; 11-13-2016 at 03:14 PM.

  2. #2
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    Re: MBA A1466 fan spin but not chime and not video

    Could be SPI issues.

  3. #3
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    Re: MBA A1466 fan spin but not chime and not video

    Do you have vcore voltage present (~1.7-1.8v)? Also, was there liquid around the clock chip/SPI ROM chip area? That's where I'd start. Make sure all your SPI ROM resistors and traces are good, and if there was liquid on or near the clock chip, I'd replace it, as it's common for those to give voltage at pin 1 but not be sending proper clock signals.

  4. #4
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    Re: MBA A1466 fan spin but not chime and not video

    Yes vcore is pressent : 1,79v........but spi_mosi is not pressent...: 0v.....all resistor are fine

  5. #5
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    Re: MBA A1466 fan spin but not chime and not video

    Quote Originally Posted by Carlosqg76 [Only Registered and Activated Users Can See Links. Click Here To Register...]
    Yes vcore is pressent : 1,79v........but spi_mosi is not pressent...: 0v.....all resistor are fine
    SPI_MLB_MOSI is not present at pin 5 of U6100, but what about SPI_MLB_CLK, SPI_MLB_CS_L, and SPI_MLB_MISO? are there any of those present?

  6. #6
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    Re: MBA A1466 fan spin but not chime and not video

    No .... 0,0 volts

  7. #7
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    Re: MBA A1466 fan spin but not chime and not video

    Was the water damage near the SMC or directly near the CPU? Did you clean the board in an ultrasonic cleaner, or are you testing it without any sort of cleaning? There may be debris/crud underneath your CPU or SMC that's interrupting the missing SPI ROM data signal.

 

 

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