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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.
iPhone 4 Repair Guide — Digital Supply USA
https://www.digitalsupplyusa.com/pages/iphone-4-repair-guide
Step 1 The new iPhone 4 has two phillips screws on the bottom as did the iPhone 3G & 3GS. Unlike previous models, the back panel is removed first to expose the internals of the iPhone 4. Step 2 Now Slide the back panel upwards to expose the internals. Once the back panel has been removed, there are several steps involving screws & clips.
Verizon iPhone 4 Teardown | iFixit News
https://www.ifixit.com/News/14286/verizon-iphone-4-teardown
Cirrus Logic CLI1495B0 Audio Codec (38S0589) Texas Instruments Touchscreen controller (343S0499) Skyworks power amplifier modules for CDMA/PCS (SKY77711-4 and SKY77710-4) According to Apple, the SIM card and SIM tray were the only user-serviceable parts in the AT&T iPhone 4.
Rapid Repair - iPhone 4 Repair Guide by RapidRepair
http://www.rapidrepair.com/guides/iphone-4/iphone-4-repair-guide.html
The iPhone 4 has two phillips screws on the bottom as did the iPhone 3G & 3GS. Unlike previous models, the back panel is removed first to expose the internals of the iPhone 4. Step 2. Slide the back panel upwards to expose the internals. Once the back panel has been removed, there are several steps involving screws and clips.
How to Fix Audio Codec Chip Problem
https://www.fixabout.com.au/blogs/news/how-to-fix-audio-codec-chip-problem
Disassembly the logic board from the frame; Heat and remove the audio IC; Clean and check all the welding spots and connect trace; Jump wire soldering is …
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