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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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iMac A1418 late 2013 - white noise from headphone jack

Hi there,

I recently purchased a 2nd hand logicboard for my A1418 iMac from late 2013. Even though the board was claimed to be in fully working condition, there seems to be an unpleasant surprise with the headphone jack/ external audio port.

By plugging in (any) headphones there is only a white noise (which sometimes changes while adjusting the volume over the menu bar of the iMac). Anyway, the internal speakers as well as sound via bluetooth devices work flawlessly,

As I was assuming that it might be due to a faulty headphone jack, I tried to replace it by one from an A1418 Mid 2014 iMac (I think they must be interchangeable?!)- however with no success.

Does anyone have had a similar problem or have a hint were to look next? It is likely to be a hardware problem. I therefore also inspected the logicboard in the area close to the port for the headphone jack for any mechanical damage - at least there is no obvious damage present.

I would be very grateful for any advice ;-)

Thanks a lot!

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White noise issues tend to be issues within the audio circuit on the logic board. If you look at the iMac Intel 21.5" EMC 2638 Teardown Step 5 you’ll see the Analog Devices SSM3302 audio amplifier location I would look around if for damaged or missing SMT devices using your original board as reference.

Frankly, I think you need to send the logic board back.

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Hi @danj,

thanks for your input, I’ll definitely take a closer look at the mentioned spots! I also was suspecting the audio circuit, but as the sound from the internal speakers does not seem to be affected / both work fine, I’d might rather pay attention to the circuit of the audio jack. Or do you think the issue could still derive from components of the amplifier area?

…currently I am looking for schematics for this board to find out.


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