PCB Tech - Six common methods of repairing circuit boards

Six common methods of repairing circuit boards

1. Visual inspection method

By observing whether the circuit board is scorched, whether there is a broken place in the copper coating, whether there is a peculiar smell on the circuit board, whether there is a poor soldering place, whether the interface, gold finger is moldy or black, etc.

2. Principle analysis method

This method is to analyze the working principle of a circuit board. For some boards such as switching power supplies, engineers can know the working principle and details without the need of circuit board drawings. For engineers, they know the schematic diagram of the PCB circuit board. Repairing is extremely simple.

3. Contrast method

The comparison method is one of the most commonly used methods for repairing circuit boards without drawings. Practice has proved to have very good results. The purpose of detecting faults is achieved by comparing the status of the good boards. By comparing the curves of the nodes of the two PCB circuit boards An abnormality was found.

4. Circuit method

The circuit method is a method of making a circuit by hand, which can work after being installed with the integrated circuit, so as to verify the quality of the integrated circuit under test. This method can reach 100% accuracy, but the tested integrated circuits have many types and complex packaging, so it is difficult to build a set of integrated circuits.

5. State method

The state method is to check the normal working state of each component. If the working state of a certain component does not match the normal state, there is a problem with the device or its affected parts. The state method is the most accurate method of all maintenance methods, and its operation difficulty is beyond the grasp of ordinary engineers. It requires a wealth of theoretical knowledge and practical experience.

6. Through killing method

Check all the components until the problematic component is found to achieve the purpose of repair. If you encounter a component that cannot be detected by the instrument, replace it with a new component to ensure that all electronic components on the board are good. To achieve the purpose of repair. This method is simple and effective, but it is helpless for problems such as blocked vias, broken copper, and improper adjustment of the potentiometer.

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