Chosen Solution
If I remove audio ic it turning on. And touch id is working fine. What may be?
The iPhone 7 series of devices have proven to be very unreliable, suffering from flex-based issues similar to the iPhone 6 Plus (Touch Disease). On the iPhone 7, the fault line runs along the top of the SIM card reader and affects the Baseband CPU and Audio IC. Any short copper traces running perpendicular to the fault line while connecting to micro-BGA pads, is subject to failing. On the Audio IC, this particularly affects the C12 pad/trace although there are 4 pads/traces along the fault line. Of those four, the C12 pad (I2S_AP_TO_CODEC_MCLK) is the most critical as it is a communication protocol line between the CPU and the Audio IC. Here are the typical symptoms, as collated by the repair community: Voice Memos app / Loudspeaker on call - greyed outSiri doesn’t hear you / Caller can’t hear youMost other Audio related issues that aren’t solved by modular replacementsLong boot times (3-5 minutes)iTunes detects the phone but stuck on the Apple Logo So you found your problem. Run a jumper on the C12 pad, reball the Audio IC and everything should work properly.
