How to Repair the CPU of a Mobile Phone by Yourself?

Repairing your phone CPU yourself is a challenging task that requires specialized tools, technical expertise, and a thorough understanding of the process. If you are not a professional, please do not disassemble or assemble it at will. Thank you

If you want to do your job well, you must first sharpen your tools. First of all, you have to prepare a set of professional Mobile Phone Repair Tools. If you don't have a suitable manufacturer, it is recommended that you choose us, and we will provide you with valuable advice and suggestions.

Necessary Tools and Equipment
1. Precision Screwdriver Set
2. Pry Tools
3. Soldering Iron and Solder Wire
4. Desoldering Pump or Wick
5. Hot Air Rework Station
6 .Microscope or Magnifier
7. Anti-static Mat and Wrist Strap
8. Tweezers
9. PCB Holder or Clamp
10. Thermal Paste
11. Multimeter
11. Cleaning Tools
12. IC Removal Tool
13. Reballing Kit
14. Hot Air Gun
15. Magnetic Mat

Note:
Only when you have these devices, you can repair your CPU independently. Once again, non-professionals are reminded not to imitate.

1. Disassemble the phone
Steps: With the phone powered off, carefully remove the back cover, battery (if removable), SIM card, and any other components that block access to the motherboard. Remove the screws and remove the motherboard from the phone case.

2. Identify the CPU chip
Steps: Do not attempt to disassemble it without thinking, you should carefully observe and find the CPU Chip on the motherboard. It usually has a label that can be identified by its location and size. Do not act impulsively.

3. Remove the CPU chip Steps
Apply solder oil around the CPU chip after finding it. Use a soldering iron to heat the solder joints around the chip. Carefully use a soldering tape to remove excess solder. Use a reflow soldering station to evenly heat the area around the CPU until it can be removed with tweezers. This is a very important detail.

4. Clean the solder pad
Steps: Use isopropyl alcohol and a lint-free cloth to clean the Solder Pads on the motherboard to remove any residual solder and flux, which is for your further installation.

5. Re-solder the CPU chip
Steps: Place the re-soldering stencil over the CPU chip. Apply solder paste to the stencil, making sure it fills all the holes. Use a heat gun to heat the solder paste until it forms an even solder ball on each pad so you can further tin it.

6. Reconnect the CPU chip
Steps: Align the re-soldered CPU chip with the corresponding pads on the motherboard. Use a Hot Air Gun to heat the chip and motherboard until they are bonded together. Make sure all connections are firm and there are no cold joints to prevent accidents.

7. Reassemble the phone
Steps: Once this installation is complete, you are not far from success. Reinstall all components in the reverse order of disassembly. Make sure all screws are tightened and components are firmly in place, then you can test the phone.

8. Test functions
Turn on the phone and check if it boots up correctly and runs as expected. Test multiple times to avoid defects. This is also the last step. When all functions are tested, your CPU should be revived.

I believe that after reading this article, you should understand the general principle. If you are not a professional, it is recommended that you find a professional to ensure that there is no risk. When you have more ideas, please consult phonefix and we will patiently answer your questions.