2022-01-14
Analysis of the common faults of PCB circuit boards caused by moisture
Whether the PCB circuit board is in production or storage, it is necessary to avoid circuit board failure caused by moisture. The following is an analysis of the common faults of PCB circuit boards caused by moisture:
The circuit board used in a humid environment, because the air contains a relatively large amount of moisture, when the moisture is too large, it will turn into water droplets and fall on the circuit board. , will be attached to the various pins or printed lines of electronic components.
Since the electronic components currently used in the circuit board are all SOP or SSOP patch components, when the moisture is converted into water droplets and drops on the pins of the SSOP packaged integrated circuit, if the circuit board is in a running state at this time, it will give the integrated circuit An invisible resistor is added between the pins, causing the circuit board to fail in a working state.
If the moisture is converted into water droplets and drops between the pins of the electronic components on the circuit board, if the circuit board is just in a non-working or power-off state, it will not immediately cause harm to the circuit board, but the pins of the electronic components or After the printed line is soaked by water droplets, the pins of the components will corrode, and after a long time, the feet will break due to rust and cause circuit board failure; after the printed line is soaked by water droplets for a period of time, the printed line mold will appear The situation of disconnection occurs, which causes the circuit board to fail to operate when it is put into operation for the first time.
The above is the analysis of common failure causes of PCB circuit boards caused by moisture. Friends can formulate relevant measures according to these reasons to reduce or avoid circuit board failures caused by moisture in electronic equipment.
