First, if you don't understand the circuit diagram, you can learn a basic knowledge at most, and you may even learn the wrong maintenance method.

Second, even if you learn a fault repair and don't understand the working principle of a mobile phone, it will be embarrassing to change a fault with a mobile phone.

Third, learning mobile phone maintenance requires a lot of tools and consumables. If you buy these tools yourself, you may be deceived by merchants with ulterior motives, and it will not pay off!

Finally, I personally suggest that if you want to study, you must go to some large mobile phone repair institutions, and then make a field trip before making plans. Master of Computer Science can be used as the standard in Shenzhen. They are tools for packing accommodation bags and consumables, so that schools can give you relevant study materials and materials with less money.