Audio codec is the chip on the motherboard that is responsible for playing sound, namely it performs the function of converting a digital signal to analog and vice versa, this chip is responsible for all the sound that plays your iPhone 7: recording on a dictaphone, music, phone conversations.
Replacing the audio codec is a very popular procedure for the iPhone 7. This problem affects absolutely all iPhone 7. The problem of the audio codec occurs because during the technological design of the board for the iPhone 7 an error occurred, so the slightest deformation of the case loses contact between the chip and motherboard. And then the iPhone 7 turns on for a long time, the speaker does not work, the proximity sensor, which turns off the screen when talking, stops when you hold the phone to your ear.
To restore the audio codec to work properly, you need to restore the lost contact between the motherboard and the audio codec. The first step is to disassemble the iPhone 7, before that, heat it on a separator for a few minutes at a temperature of 75 degrees. We unscrew all protective laths which are in places of connection of loops to a motherboard, we disconnect loops of the screen and we put aside it. The next step is to get the board out of the case, to do this, unscrew all the screws that secure the motherboard to the case.
In order to further repair the audio codec on the iPhone 7, we will need a microscope and a soldering station. The audio codec chip is located under the protective screen on the back of the board. Next, turn on the hair dryer at the soldering station, set the temperature to 326 degrees, place a special spatula in the lower part of the chip, so that at the time when the solder under the chip became liquid, the audio codec could be easily removed from the motherboard. When unsoldering the chip, it is important not to overheat the adjacent elements and elements on the other side of the board, so this work should be performed only by qualified craftsmen. After the chip is removed, you need to restore contact by cleaning the track on the board and duplicate it with a thin copper conductor and apply a special varnish that is a dielectric, and dry it under ultraviolet light. Next, clean the seat from the remnants of solder with a special copper tape that absorbs the remnants of solder. Using the same tape, remove the solder residue from the audio codec chip. The next step is to use a stencil and solder paste to restore the solder layers on the audio codec chip. Next, clean the seat and the audio codec chip with alcohol from the flux residues. In order to install the audio codec in its place, apply the flux to the seat, install there the audio codec chip in the same way as it was installed. After all the above procedures are performed, take the hair dryer again and at the same temperature solder the audio codec chip to its seat, the chip itself should fall into place, after the solder became liquid, it is necessary to carefully move with a spatula which removed the audio codec, lightly push the audio codec chip to check if it is soldered to the motherboard. If the chip rises in place after a light shock, then the chip is soldered correctly. We clean the board with alcohol so that there are no flux residues on the board. At this point, the soldering process is complete, then you need to wait a few minutes for the motherboard to cool, and only then can you assemble the iPhone 7 in reverse order. Before you completely assemble the phone, you need to test the operation of the restored chip, to do this, install the motherboard in the case, connect all the connectors of the cables to the board and turn on the phone. If all functions work properly after testing, it means that the audio codec has been repaired successfully and we can close the phone. For this purpose by means of screws we fix a motherboard in the case, we establish back all protective laths. Also, the iPhone 7 display is glued around the perimeter to the case with a special sizing that protects the phone from water and dust. Therefore, using an ordinary ear stick and alcohol, remove the remnants of the old sizing and degrease the place where the sizing is, and apply a new one. Close the phone by installing the display module in its place starting from the top of the display. Once the screen is installed, tighten the two lower screws at the bottom of the smartphone, near the charging connector. This completes the repair of the audio codec in the iPhone 7.
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