IPHONE 7 NO SOUND | Audio Codec Pad Restoration (U3101 338S00105)
The main cause of this audio problem on the Apple iPhone 7/7 Plus is:
The solder pads under the U3101 338S00105 audio codec chip have come loose.
00:00 intro
00:40 necessary tools
01:40 removing the audio codec
02:40 removing excess solder
04:45 repairing the solder pads
06:30 preparing the chip for ball-bearing rolling
08:00 ball-bearing rolling on the audio codec
13:00 cleaning the chip
13:50 installing the audio codec
16:10 checking operation
The consequences of the audio problem on the iPhone 7 are:
Dropping the iPhone
Constant shaking and impacts
Poorly positioned chip in the center of the board.
The chip is indeed poorly positioned. Where the case often deforms, this affects the audio codec and its mounting location. My colleagues and I have even seen cases where the audio codec chip cracked after severely bending the case. Many of the pads underneath were torn off—it couldn't be repaired, so the board had to be replaced. This case was exceptional; a car drove over it.
So how do you fix this sound issue? It's not that simple.
In this video, I clearly demonstrate all the steps and the complexity of the repair. I tried to record the entire sequence in great detail using a microscope camera, which shows all the details up close and clear.
Screen Replacement
• Disassemble - Disassemble
• Screen Replacement - Screen Replacement
• Battery Drain - Battery Drain
• No Charging - Not Charging
• Back Cover Replacement - Back Cover Replacement
• Doesn't Turn On - Doesn't Turn On
• Diagnostics - Diagnostics
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