In today's world, smartphones have become an indispensable tool in daily life. Huawei P30 has won the favor of many users with its excellent performance and innovative design. However, Huawei P30 users often encounter problems such as "repeated restarts" and "unable to turn on". Today, PhonefixLet’s discuss how to solve the problem of Huawei P30 repeatedly restarting and failing to turn on.
1. Disassembly and preliminary inspection:
After receiving the repair request for Huawei P30, the repair technician first conducted a preliminary inspection of the device. The repair work began with disassembly. Then the back cover of the phone was carefully removed. Since the device has a glass back cover, the operation requires precision to avoid cracking or damaging the glass back cover.
2. Disconnect the battery and internal components.
After removing the back cover, we need to disconnect the battery to avoid short circuits during the repair.
Anti-static pry bar: We use anti-static pry bar to carefully disconnect the battery connector, making sure not to damage the battery or connector.
Precision screwdriver: After disconnecting the battery, we use precision screwdriver to remove the screws that secure the metal shield of the motherboard to ensure smooth access to the motherboard.
3. Check the faulty components on the motherboard to find out the reason for repeated restarts.
Although the Huawei P30 has powerful performance, it integrates complex hardware components inside, especially the communication between the motherboard and the CPU is very critical. When a fault occurs, the device will fall into a restart loop, indicating that the system cannot start smoothly, there may be a connection problem or hardware damage.
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Appearance inspection: Use magnifying glass to carefully inspect the CPU and surrounding solder joints to check for loose connections or damaged solder joints.
- Multimeter: We use digital multimeter to measure the electrical connections between the CPU and other components of the motherboard to confirm that the CPU is communicating properly with the other components.
4. Remove the CPU
Once we have confirmed that the CPU is the source of the problem, the next step is to carefully remove it. Since the CPU is soldered to the motherboard, this requires a very precise operation.
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Soldering Station : We use a hot air rework station to heat the CPU area to soften its solder joints so that the CPU can be safely removed from the motherboard.
- Tweezers : After heating, we use tweezers to carefully remove the CPU from the motherboard. The whole process must be slow and precise to avoid damaging the motherboard or other components.
5. Re-balling the CPU
After removing the CPU, we need to re-ball, that is, replace the old solder balls to ensure a stable connection when reinstalling. After removing the CPU, the maintenance personnel will thoroughly clean the solder joints on the motherboard to remove residual solder and impurities in preparation for re-soldering.
Ball placement kit: We use a ball placement kit that contains new solder balls of the correct size, flux, and a stencil. We place the solder balls on the pads of the CPU.
BGA Stencil: The BGA ball placement stencil is used to accurately position the solder balls. After placing the stencil on the CPU, we place the solder balls into each hole.
Reflow : After placing the solder balls, we put the CPU into a reflow oven or heat it using reflow oven . The heating process melts the solder balls and forms a stable connection
6. Inspection and testing
After welding is completed, use a trinocular zoom microscope to check the solder joints to ensure that the welding quality is good and there are no cold solder joints or short circuits.
Perform a functional test to ensure that the re-soldered CPU is stably connected to the motherboard and can work properly.
Conclusion:
Huawei P30 repeatedly restarted and could not turn on. The successful solution of this problem by replanting the CPU fully demonstrates the importance of professional repair tools. It not only restores the normal operation of the device, but also prolongs its life. If your device also encounters similar problems, Phonefix stores provide professional repair tools and accessories to help you easily solve digital device problems and bring you a worry-free user experience.
