PCB Tech - How to repair the PCB printed circuit board?

Abstract: In the process of PCB production or use, the circuit board will work abnormally or even burn out due to factors such as processing errors, improper use and component aging. Here is an introduction to the general process, precautions and skills of circuit board repair.

So how do we repair PCB? Let me think about it.

Preparations for repairing circuit boards: circuit boards that need to be repaired (needless to say), universal meters (testing), oscilloscopes.

The steps and process of how to repair the circuit board:

1. Check the status of PCB components

Check whether the components on the faulty circuit board have obvious damage, such as electrolytic capacitor burnout and swelling, resistor burnout, and power device burnout;

2. Look at the PCB soldering situation

For example, whether the repaired circuit board is deformed or warped; is there any solder joints falling off or obvious weak soldering; whether the circuit board copper clad skin is warped, burned and blackened.

3. Observe the pad

Check whether the pad is connected to tin, peeling off, and whether it is soldered to the components;

4. Plug-ins for observation components

Such as integrated circuits, diodes, circuit board power transformers, etc. are correctly inserted in the direction.

5. Simple test of resistance, capacitance and inductance

Use a multimeter to perform a simple test on the suspected components such as resistance, capacitance, and inductance within the range to test whether the resistance value increases, capacitor short circuit, open circuit and capacitance change, inductance short circuit and open circuit.

6. Power-on test

After the above-mentioned simple observation and testing, the fault cannot be eliminated, and the power-on test can be carried out. First test whether the power supply of the circuit board is normal. Such as whether the AC power supply of the circuit board is abnormal, whether the output of the voltage stabilizer is abnormal, whether the output of the switching power supply and the waveform are abnormal, etc.

7. Brush the program

For programmable components such as single-chip microcomputers, DSPs, CPLDs, etc., consider rewriting the program to eliminate circuit failures caused by abnormal program operation.

The above is how to repair the basic steps of general circuit boards. If you have any questions, consult us, or if you need circuit board soldering, SMT patch, PCB design and board manufacturing, etc., you can also contact the PCB factory!

The PCB factory should integrate PCB design, PCB manufacturing, electronic components purchasing, SMT patch, circuit board welding, coil winding, connector crimping, electronic product processing, assembly and design in one one-stop service platform, with a powerful R&D and design capabilities and product manufacturing capabilities, dedicated to quickly turning your needs into PCBA products.

The PCB factory should provide customers with one-stop services from hardware design, intelligent manufacturing to intelligent products, allowing you to save time and energy, production costs, and devote yourself to the development and sales of new products. And has R&D and design capabilities and product manufacturing capabilities, and is committed to quickly turning your needs into smart hardware.