Let me answer that question. According to my several experiences and sentiments obtained in the maintenance of the circuit board to share with friends. Our friends who have repaired electronic products know that in a complete electronic product, there is generally a circuit board to a few pieces of circuit board according to different functions in different positions of electrical appliances, its function is not the same, we call the main function of the circuit motherboard, such as induction cooker circuit motherboard, key display board, etc.; LCD TV has switching power supply board, key receiving display board, TV motherboard, audio, video, USB interface board and so on. So how do we repair the circuit board? I think first learn the following points in order to really learn to repair circuit boards.
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When we study maintenance, we often hear the master say that \"practice without theory is blind practice\". This sentence shows that when learning maintenance, we should learn some basic theoretical knowledge of electronics, such as electrical principles, analog circuits, digital circuits, etc., we do not need to in-depth study but we need to understand. For example, three amplifier circuit forms, several circuit feedback forms, two characteristics of the op amp, etc., which is very important for us to understand the circuit diagram.
When repairing the circuit board, it is necessary to learn to detect and identify commonly used electronic components, understand the characteristics of common electronic components, and know their basic role. For example, the most common component resistance, which can play a part in the circuit, current limiting, coupling, sampling, false load, pull-up resistance, pull-down resistance, and the capacitor together to form timing, oscillation and so on. The role of these common components should be understood.
After learning these, but also learn to run the circuit board skills and knowledge, which is what we often say about the circuit board mapping. Because our large number of maintenance practices show that most electrical appliances have no circuit schematic reference when maintenance, in the face of an unfamiliar circuit board, if you want to know the pulse of the circuit board signal, you can only learn to map the circuit.
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The last point I want to say is that we should learn to use common instruments and welding tools, such as the most common multimeter (pointer or digital), oscilloscope (analog or digital), millivolt meter, function signal generator and so on. These are commonly used instruments for the maintenance of circuit boards, and some containing MCU boards also need logic analyzers, programming burners, etc. Tools In addition to common electrical tools, it is best to also need heat guns, welding tables, magnifying glasses, etc. Said so much, in fact, these are the necessary knowledge and skills to learn to repair circuit boards.
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The above I share with all my friends is my understanding when I learn to repair the circuit board, there are incomplete places welcome to discuss! Reprint, point?? ! Progress together!!
1. Understand electronic components and measure them
2. Can use various instruments and tools such as multimeter, oscilloscope, electric soldering iron, heat gun and so on
3. Understand a variety of basic circuit diagrams
4. Discuss and consult people with maintenance experience
The above are the most basic, in the process of maintenance, constantly sum up experience, repair more naturally skilled, combined with experience to form a maintenance idea of their own, get a circuit board know where to start, although now many circuit boards are integrated, broken directly for the corresponding circuit board, but to fine repair also need a solid foundation, step by step
Circuit board knowledge
I am electronic love number, want to learn, culture is not high.
First of all, first buy a multimeter, soldering iron, tin absorber, solder, go to the home appliance maintenance department to buy a few circuit board, come back to understand the components, remove, test component parameters, how to test the components are good or bad, those characteristics are bad, what is the good device, like a diode, good 0.7V voltage drop, bad is not short circuit is short circuit, First know their characteristics, removed components, to be installed back, to ensure that the copper skin is not destroyed, solder joints to be uniform and bright, repeated many times, component welding, measurement can basically get started, find circuit diagrams, buy components, welding, debugging, such as voice control lights. In looking for the principle, do a few circuits, familiar with, and then continue to learn, e-learning is not so fast, the foundation is good, you can learn microcontroller, programming.
First of all, you have to understand the types of electronic components, characteristics, symbols, the representation method on the circuit diagram and the reading method of the value, and then you also have to understand the principle of the unit circuit, analyze the role of each component in the circuit, and then you have to learn to use the multimeter, soldering iron, wind gun and other tools, and finally see more and practice more.