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Old 06-02-2020, 06:15 PM   #1
N3WBTVLLC
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Default 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?
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Old 06-02-2020, 08:56 PM   #2
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Default 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?
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Old 06-02-2020, 11:06 PM   #3
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Default 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.
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Old 06-03-2020, 03:49 AM   #4
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

did u check audio ic for power, short on outputs ...
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Old 06-03-2020, 08:19 AM   #5
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Let me check I am certain I did but that may have not been checked.
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Old 06-03-2020, 08:53 AM   #6
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Default 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.
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Old 06-03-2020, 03:07 PM   #7
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Whats the board number. Schematic and boardview?
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Old 06-03-2020, 03:16 PM   #8
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Did you check the SMBus (I2C) connections to the AUDIO ICs?
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Old 06-03-2020, 05:24 PM   #9
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

The board is 820-3330B
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Old 06-04-2020, 01:18 PM   #10
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Quote:
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.
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Old 06-13-2020, 07:24 AM   #11
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Default Re: MacBook Pro 15" Mid 2012 Unibody NO AUDIO

Any progress??
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