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820-00165 No S0, SYSCLK(s) trying to turn on, corrosion all over

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  • #16
    Yeah it was pretty fucked. I'll leave it here then and try SPI data lines and clock chip as both had corrosion.
    Thank you for your help

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    • #17
      Yes!! It boots. No audio though.

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      • #18
        Audio is on the IO board, so probably bad connector/cable/IO board.

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        • #19
          Originally posted by dukefawks View Post
          Audio is on the IO board, so probably bad connector/cable/IO board.
          So I have tested 3 IO boards and cables. Bleeped out the board connector on J9500, checked all solder joints are OK.
          Checked the enables are good for audio around U8040, even replaced U6410 and anything in it's path....

          I feel like I have come too far with this board to give up because of audio!
          I have pretty much rebuilt the entire board because there were little girl tears over this fucked MacBook which is why I did not just laugh and send it back.

          Any more clues or are we at the end?

          Thanks for your efforts

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          • #20
            Check Q1920 circuit and all other HDA data lines.

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            • #21
              Where is the origin of the audio signal?... I mean before amplification or anything.

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              • #22
                The OS does at least know there is an audio device it just does not output any audio.
                Probably put this board to one side for a day or so now.

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                • #23
                  SPKRAMP_SHDN_L high? Verify voltage on C9520.
                  If you can change volume in OSX data to audio chip is ok. Try with a headphone too.

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                  • #24
                    C9520 = 1.5V
                    SPKRAMP_SHDN_L = low = 0V
                    Yes level shift on volume but no Headphones output or speaker. Get audio on BlueTooth.
                    Last edited by G.Beard; 10-08-2016, 07:42 PM.

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                    • #25
                      Well SPKRAMP should be high! Is generated on the IO board. Did you check all HDA lines at J9500 on diode mode? AUD_PWR_EN high?

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                      • #26
                        Originally posted by dukefawks View Post
                        Well SPKRAMP should be high! Is generated on the IO board. Did you check all HDA lines at J9500 on diode mode? AUD_PWR_EN high?
                        SPKRAMP: New IO on the way in case all my IO boards are fucked which is possible I guess.
                        HDA lines on J9500 no shorts.... Are you asking exact drop across each?
                        AUD_PWR_EN high.

                        I live in hope that I am a complete numpty without a working OI as I may have swapped them all out. Get back in a couple of days. Actually amazed this board boots at all
                        Thanks for your help

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                        • #27
                          SPKRAMP not being pulled down by the board? bad U6410, measure diode mode.

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                          • #28
                            Originally posted by dukefawks View Post
                            SPKRAMP not being pulled down by the board? bad U6410, measure diode mode.
                            SHDN low
                            Just found that a pads that "looked" there, are actually not there. SHDN and GAIN
                            I will replace U6410 and test diode mode etc.

                            Double checked continuity to all pins to J9500 back to anything audio and all good. Resistors OK, no shorts.
                            No headphones, is bluetooth, internal is recognised and volume shift.

                            I wonder if tying SHDN to PVDD will work
                            Last edited by G.Beard; 10-11-2016, 02:48 PM.

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                            • #29
                              Analog section of the audio chip must not be powered. Only power source I see for that is pin 9 or 28. See if R9501 is really no stuff and check continuity of pin 9 through the connector/cable to the io board.

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