First of all, before you start learning to repair your mobile phone, you must understand what you will do after you learn it well. With a clear goal, we must first learn the principle and operation method of mobile phones. After you can operate skillfully, learn the skills you want to increase, such as welding skills. If you are interested, you should learn other things. Here are some things that beginners must learn.

1, to learn about common names, concepts, graphic symbols, unit system, etc. Electronic technology in mobile phones.

At first, you must know the commonly used names and concepts, such as what is current, voltage, resistance, DC, alternating current, etc. These are the minimum knowledge of junior high school physics. For some confusing names, such as voltage, voltage drop, potential, potential difference, electromotive force, etc. , not only to understand their differences, but also to know their text symbols, units and conversion.

2. Learn the knowledge of mobile phone components. Including the identification of various components and devices in mobile phones, learning and understanding the principles of various components and devices, and mastering the measurement methods of components.

3. Understand the circuit principle. Such as: the principle of amplifier circuit, oscillator circuit, switch circuit, etc. Understand and master the component characteristics and circuit structure of mainstream models in the market.

4. Understand the working principle and basic circuit structure of GSM mobile phone. It mainly includes: how the mobile phone works, and the composition of the mobile phone circuit, including: receiving circuit, transmitting circuit, frequency synthesis circuit, logic circuit, power supply and charging circuit, and interface circuit, which should be clearly seen in blocks. Start with the basic electronic unit circuit, learn to read, read and draw, and learn to analyze the working principle of the basic circuit. The analysis circuit should be analyzed step by step along the signal path from input to output. To find out which signals are contained in the key points of the circuit, we must know their normal waveforms, amplitudes, voltages and working frequencies. It is also necessary to understand the functions of all levels of circuits and the functions of various components in the circuits.

5. Learn to use mobile phone maintenance tools and instruments. Including air guns, soldering irons, multimeters, oscilloscopes, frequency meters, etc. Master the disassembly and welding technology of mobile phone components.

6. Read more mobile phone maintenance experience, and pay attention to learning other people's fault analysis and judgment methods. You can't just look at what others have changed, you must work hard.

7. Don't give up the faulty mobile phone, watch more, think more and practice more!