From another region, a shipment to Bgacenter received an iPhone 10 with a malfunction – it does not turn on. The device is not subject to warranty repair, since the cause of the malfunction is a fall and mechanical damage. The main task in this repair is to save the customer’s data. And to do this, you need to turn on the device, since automatic data saving to icloud cloud storage was not configured. The phone was repaired during soldering training. iPhone-model A1901, intended for use in the Russian Federation (Rostest). According to the client, the device has not been repaired before.
The phone does not turn on after a fall and as a result is not detected by the computer.
When connected to a USB-tester, there is no consumption.
Diagnostics were performed in the following order:
The ammeter did not show the current consumption of the motherboard, which indicates that there is no short circuit in PP_BATT_VCC (primary power supply) and PP_VDD_MAIN (secondary power supply). This stage of diagnostics, it is possible to produce using a multimeter, without LBP;
Since it is impractical to restore a large number of contacts, a decision was made and agreed with the client to transfer the main chips to the donor Board. Namely the following chips will be re soldered:
The sequence of repair of iPhone X
Preparation of the donor Board for the installation of chips, consisted of:
Next, the iPhone X Central processor is soldered from the client Board, using the lower Board heater.
The CPU was stripped of the remaining solder and compound. Performed CPU reballing with 0.2 balls.
Using a thermal air soldering station, NAND and ARB were dismantled.
Subsequent repair of iPhone 10
On the prepared donor Board, the Central processor was soldered, using a key.
Since the ARB chip is necessary for enabling and further activating the phone, the chip removed from the repaired Board was soldered.
U2600-soldered by key.
At all stages of soldering, heat sinks were used to prevent overheating of the elements on the motherboard.
The next step is intermediate diagnostics. Check for a short circuit.
First turned on the LBP, then limited the current to 0.5 amperes. And connected the Board to the laboratory power supply. No short circuit detected.
Using socket, we connected the two boards to each other and connected the iphone 10 to the laptop.
The phone was detected in recovery mode. Then flashed with data saving using the program 3uTools.
Then the boards were soldered together using the lower heating for the boards.
Fully assembled client iPhone 10.
For additional verification, we connected a fully assembled phone to a laptop and performed a check via 3uTools.
Within a few hours, the phone was tested. Be sure to check the operation of sensors, FACE ID, cameras and microphones, etc.
We sent the device to a satisfied customer.
If the iPhone 10 does not turn on, one of the repair options is to transfer the main chips to the donor Board. Repairs are not easy, because one of the conditions stated by the client is that full data storage is required. The time for such repairs is approximately 4 hours, and the cost starts from 12,000 rubles.