The likely hood is either a wiring issue from the analog side of the Cirrus Logic CS42L84A Audio Codec chip or the speaker. As you are stating the plugged in headphones are not encountering an issue that removes the connection path to the Jack. That then focuses us to the speaker path or the speakers them selves.
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Using the balance control in the sound controls are you able to hear a difference between the speakers by biasing one over the other or do both Sean off?
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Using the balance control in the sound control panel are you able to hear a difference between the speakers by biasing one over the other or do both sound off?
I would also check for possible liquid damage around the speaker connections.
Apple won’t try fixing the logic board which might be a simple fix.
The likely hood is either a wiring issue from the analog side of the Cirrus Logic CS42L84A Audio Codec chip or the speaker. As you are stating the plugged in headphones are not encountering an issue that removes the connection path to the Jack. That then focuses us to the speaker path or the speakers them selves.
Using the balance control in the sound controls are you able to hear a difference between the speakers by biasing one over the other or do both Sean off?
I would also check for possible liquid damage around the speaker connections.
Apple won’t try fixing the logic board which might be a simple fix.