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iPhone 7 “Audio IC Disease” Repair - Disc Depot Dundee
https://www.discdepotdundee.co.uk/iphone-7-audio-ic-disease-loop-disease-repair/#:~:text=It%E2%80%99s%20widely%20believed%20the%20problem%20is%20ultimately%20due,flat%20audio%20IC%20get%20strained%20and%20eventually%20broken.
iPhone 4 Sound Problems | iFix South Africa
https://ifixsa.wordpress.com/2012/02/20/iphone-4-audio-codec/
This is because of a faulty audio codec IC on the circuit board, or more correct, shoddy soldering under the IC. The audio IC’s job is to combine the top speaker and mic into a call, whenever one of these components fails during a call, but works when tested independently from each other you can be certain it’s a faulty audio codec IC.
Replacement For iPhone 4 Audio IC Replacement 338S0589
https://www.unionrepair.com/replacement-for-iphone-4-audio-ic-replacement-338s0589.html
Replacement For iPhone 4 Audio IC Replacement 338S0589. Model No. : 338S0589. Compatiable:Phone 4S,Pad 2 ,Pad 3. When do you need the replacement of the Audio Compiler IC. you are able to hear the recipient on the other side clearly, but the recipient cannot hear you. you are not able to converse even using a handsfree or the speaker phone in the mobile
Outgoing sound (internal and optional mic) drops out on ...
https://www.ifixit.com/Answers/View/55351/Outgoing+sound+(internal+and+optional+mic)+drops+out+on+iPhone+4
History. Above is all hold supported and true, your iphone is facing terminal failure due to bad audio ic. My recommended way is to remove the back cover, heat up the audio IC area while in a speakerphone call untill you hear sound. For 10 seconds of sound, quickly blow the area with canned air and cool it down.
How do I know if the management ic is damaged? - …
https://www.ifixit.com/Answers/View/119375/How+do+I+know+if+the+management+ic+is+damaged
As for the microphone problem I can almost guarantee that the problem is the audio IC (located on the top left corner of the logic board- you have to take the logic board out to see it) You can resolve the issue by removing a part of the heat shield metal and putting something like a cushion (I used folded paper+tape) to put more pressure on the IC therefore …
Sound quality of iPhone 4/4S - Articles - SoundExpert
http://soundexpert.org/articles/-/blogs/sound-quality-of-iphone-4
UPDATE: iPhone 4S has the same audio quality as iPhone 4. Despite the fact that audio chip in iPhone 4S has different labeling: iPhone 4: Apple 338S0589 / Cirrus Logic CLI1495B0 42L61. iPhone 4S: Apple 338S0987 / Cirrus Logic CLI1560B0 42L63. the overall audio performance is almost similar to iPhone 4.
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