In the process of SMT chip production and use, it is inevitable that improper operation will occur throughout the PCBA manufacturing process and use, including processing errors, improper use, component aging and other factors that may lead to abnormal work, and even affect the use of the entire product. However, many products do not need to be completely replaced. At this time, it is necessary to repair and maintain the internal circuit board. The following are PCBA maintenance methods.
Inspection of components
When it is necessary to repair the products of the SMT chip processing plant, it is necessary to first determine whether there are any errors, omissions and inversions in the components of each solder joint. Confirming that there is no authenticity of any material is also a case in point. If errors, omissions, inversions and trueness are eliminated, we can get a faulty board and first check that the board is intact, that each component is not visibly burnt and that it is inserted correctly.
Solder Condition Analysis
Board defects are basically 80% of solder joint defects. Whether the soldering of the joints is adequate and there are abnormalities, it is necessary to first refer to the ISO9001 quality system management standards. It is also necessary to refer to various SMT processing soldering quality standards to check whether there are any obvious defects, such as false soldering, fake soldering, short circuits, and whether the copper skin is obviously lifted. If there is, we need to repair the defective point of this product, if not, you can proceed to the next step.
Component Orientation Inspection
In this process, we have basically eliminated some of the defects that are visible to the naked eye. Now, we must still double check that the most commonly used components on the board, such as diodes, electrolytic capacitors, and other provisions relating to orientation, or that the components required for the negative terminal are not inserted in the wrong orientation.
Tooling Inspection of Components
If all visual judgements are correct, then at this point we need to borrow some auxiliary tools. most commonly used in SMT chip processing factories is the use of a multimeter to simply measure our components, such as resistors, capacitors, transistors, etc. The main test is to check the resistance of these components. The main test is to check whether the resistance value of these components is not in accordance with the normal value, whether it is big or small, whether the capacitor is open circuit, whether the inductor is open circuit, etc..
Power-on test
After all of the above processes have been completed, routine problems with the components can essentially be eliminated and the board will not be ablated and damaged due to short circuits or bridging. You can then plug in the power supply to see if the board functions properly accordingly.
Zhejiang NeoDen Technology Co., LTD., founded in 2010, is a professional manufacturer specialized in SMT pick and place machine, reflow oven, stencil printing machine, SMT production line and other SMT Products. We have our own R & D team and own factory, taking advantage of our own rich experienced R&D, well trained production, won great reputation from the world wide customers.
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