What is circuit board three proof paint repair? Coating with three proof paint is usually the last process in PCB assembly. However, during inspection, electronic components may have defects, which requires the three proof paint coating to be repairable. So it is generally called circuit board three proof paint repair. How was it done specifically?
Applying three proof paint to electronic components used in harsh environments can provide various protections for circuit boards, including moisture resistance, mold resistance, dust prevention, insulation, minimizing dendrite growth, and stress relief. Three proof paint makes electronic components more durable, improves the reliability of electronic devices, and reduces warranty costs.
When the circuit board needs to be repaired, the expensive components on the circuit board can be removed separately and the remaining parts can be discarded. But a more common method is to remove all or part of the protective film on the circuit board and replace the damaged components one by one. When removing the protective film of the three proof paint, it is necessary to ensure that the substrate under the component, other electronic components, and structures near the repair location are not damaged. The methods for removing the protective film mainly include using chemical solvents, micro grinding, mechanical methods, and welding through the protective film.
The use of chemical solvents is a common method for removing the protective film of three proof paint, and its key lies in the chemical properties of the protective film to be removed and the specific chemical properties of the solvent. Micro grinding is the use of high-speed particles sprayed from a nozzle to "grind" off the protective film of the three proof paint on the circuit board. Mechanical methods are particularly easy to remove the protective film of the three proof paint. To solder through the protective film, first open a discharge hole on the protective film to allow the molten solder to be discharged.