Announcement

Collapse
No announcement yet.

MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    MacBook Pro 15" Mid 2012 Unibody NO AUDIO

    So get this, I replaced the Cirrus Chip on this board assuming it failed, and tested all the volts in most of the chip and they all do fine. But I still have no audio, I traced down to other few areas and still no avail. SO basically I am lost, I have the schematic and can't seem to figure out which is the INTERNAL AUDIO components I need to test and replace, I read the chip on the board schematics and I know common sense applies to some ares like AUDIO MIC etc...blah blah blah...My question is what should I look for on this board to find out why the audio is not playing, ALSO I replaced the Headphone jack as well and still have the same issue. Did a reset as well (smc and nvRam) and still no avail. Can someone point me in the right direction?
    sigpic
    MEOWING IN THE IMPOSSIBLE UNIVERSE!

    #2
    Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

    No audio on speakers or headphones? No chime even after PRAM reset? Does audio device show up in System Preferences? Does it say Digital Out only?
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment


      #3
      Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

      No chime ever, no devices being shown either. Did reset and chime never came back. Swapped out Audio Codec chip with a new one and still no sound. I am lost at this point.
      sigpic
      MEOWING IN THE IMPOSSIBLE UNIVERSE!

      Comment


        #4
        Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

        did u check audio ic for power, short on outputs ...

        Comment


          #5
          Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

          Let me check I am certain I did but that may have not been checked.
          sigpic
          MEOWING IN THE IMPOSSIBLE UNIVERSE!

          Comment


            #6
            Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

            Yeah I did check this area. Its the AUDIO Codec Chip. I replaced it but I guess that wasnt the issue. It def is a short somewhere.
            sigpic
            MEOWING IN THE IMPOSSIBLE UNIVERSE!

            Comment


              #7
              Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

              Whats the board number. Schematic and boardview?

              Comment


                #8
                Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

                Did you check the SMBus (I2C) connections to the AUDIO ICs?

                Comment


                  #9
                  Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

                  The board is 820-3330B
                  sigpic
                  MEOWING IN THE IMPOSSIBLE UNIVERSE!

                  Comment


                    #10
                    Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

                    Originally posted by N3WBTVLLC View Post
                    The board is 820-3330B

                    What happens when you press the volume buttons?

                    When it does not appear in system preferences, it means that the SMC does not "see" the audio device.

                    It could be SMBus connections failure or bad audio driver in firmware. Try make a backup of your EFI ROM, then flash a good known EFI Rom from this forum.

                    Other suggestions:
                    Maybe HDA_RST_L is held low?

                    Corrosion under SMC?

                    Bad connections caused by almost no see corrosions. Had an issue with missing charger detect signal. The trace looked fine, but was broken at the edge of a testpoint.

                    Comment


                      #11
                      Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

                      Any progress??

                      Comment

                      Working...
                      X