PCBA Tech - PCBA repair technical experience sharing, PCBA repair process

PCBA repair technical experience sharing, PCBA repair process
In the production process of SMT patch processing, due to the entire PCBA manufacturing process and the use of problems, it will cause abnormal work or even poor use of the entire product. And many products do not require all replacements. This requires repair and maintenance of the circuit board inside. So this involves the maintenance of PCBA. Today, the editor is here to briefly share some technical experience and skills of circuit board maintenance. Please see the following:

Generally, the maintenance technicians in our patch processing plant will perform the following operations:

1. Check the components

When the products in the SMT chip processing plant need to be repaired, the first thing to do is to determine whether the components of each solder joint have errors, omissions, and inversions. Confirming the authenticity of no materials is also a situation that needs to be considered. Electronics imported chips from Sweden in 2011, so the supply of European and American countries may not be better than Huaqiangbei. If the problems of error, leakage, reverse and authenticity are eliminated, you can get a faulty circuit board. First check whether the circuit board is intact, whether each component is obviously burned out and whether it is plugged in.

2. Analysis of welding status

Basically 80% of the defects of the circuit board are the defects of the solder joints. Whether the solder joints are full and whether there are abnormalities, first of all, we must refer to the management standards of the ISO9001 quality system and various SMT processing and welding quality standards to check whether there is any Visual defects such as false welding, false welding, short circuit, and whether the copper skin is obviously lifted. If so, you need to repair the defective points of this product, if not, you can proceed to the next step!

3. Detection of component orientation

In the process of this link, we have basically eliminated some defects that can be seen with the naked eye. Now we still need to carefully check the diodes, electrolytic capacitors, the most used components on the circuit board, and other regulations on the direction, or positive Whether the components required by the negative pole are inserted in the wrong direction.

4. Tool inspection of components

If all the visual judgments are no problem, we need to borrow some auxiliary tools at this time. The most commonly used in SMT patch processing plants is to use a multimeter to simply measure our resistance, capacitance, transistor and other components, with a multimeter. The most important thing to check is to check whether the resistance values of these components are not up to the normal value, become larger or smaller, whether the capacitance is open, whether the inductance is open, and so on.

5. Power-on test

After all the above processes are completed, the conventional problems of the components can basically be eliminated, and there will be no ablation damage to the circuit board due to short circuits or bridges when the power is turned on. You can turn on the power and check whether the corresponding function of the circuit board is normal

After basically all the processes are over, the customer’s BOM and Gerber are eliminated, and the schematic diagrams can be used to judge and repair the defects of the customer’s products. In the patch processing plant, the technicians in our maintenance department are carefully selected from the workshop. Professional players.

Well, the above is the PCBA repair technology experience shared by Electronics Editor, and the relevant content of the PCBA repair process. If you want to learn the circuit board repair technology systematically, you can click on us; we will regularly share some SMT for you Practical tips in processing plants, including but not limited to maintenance.