Getting a view of the battery via Coconut will help in discovering if the I/O board is the issue or if the I/O cable is.
The loss of sound revolves around the I/O board DAC logic (Cirrus chip) [product|IF188-092] and the headphone jack which has some switches within it
[image|2551220]
Hopefully its only the cable [product|IF188-089-2]
Review this guide to replace either [guide|40695]
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=== Update (12/26/2021) ===
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Well thats a bit of a surprise! Your battery is also at the end of its life. You’ve squeezed out over 1,433 cycles when the battery was only expected to last 1,000. [link|https://support.apple.com/en-us/HT201585|Determine battery cycle count for Mac notebooks] while its also a bit on the old side as well being over six years. So its clearly time for a new battery [product|IF188-113-2] and here’s the guide [guide|40697]
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So now it’s a matter of replacing both the battery and the I/O board.
Getting a view of the battery via Coconut will help in discovering if the I/O board is the issue or if the I/O cable is.
The loss of sound revolves around the I/O board DAC logic (Cirrus chip) [product|IF188-092] and the headphone jack which has some switches within it
[image|2551220]
Hopefully its only the cable [product|IF188-089-2]
Review this guide to replace either [guide|40695]