5x (5pcs) iPhone 6S/7 Audio Codec IC (U3101, U3500)

The Cirrus Logic CS42L71 Audio Codec IC handles audio function for the Apple iPhone 6S, 6S Plus, 7, and 7 Plus.

The ICs connection is commonly damaged shock and flex, usually resulting in a fracture at pad “C12”, on the I2S_AP_TO_CODEC_MCLK line.

A fracture on this line breaks communication on the I2S bus, resulting in the following symptoms

• Glitching/slow touch response
• Stuck on Apple Logo
• Boot Loops
• No Audio