source:Industry News release time:2023-09-08 Article author:yu Popular:pcb
PCB boards often encounter various problems during the design and production process, such as short circuits, open circuits, and golden solder joints. Next, let the engineer explain in detail the common problems and cause analysis of PCB circuit board sampling for you.
1. PCB board short circuit
This is one of the common faults in PCB board production, and there are many reasons for this problem:
1) The biggest cause of PCB short circuit is improper design of solder pads; At this point, the circular welding pad can be changed to an oval shape, increasing the distance between points.
2) Improper design of PCB component orientation can also cause short circuits.
3) Automatic plug-in bending foot. It can also cause PCB short circuits.
4) Other reasons, such as large substrate holes, low tin furnace temperature, poor solderability of the board surface, failure of solder mask, and board surface pollution.
2. PCB open circuit
When the trace breaks, or when the solder is only on the solder pad and not on the component lead, an open circuit occurs. In this case, there is no adhesion or connection between the component and the PCB.
3. Dark and granular contacts appear on the PCB board
The reason is mostly due to the contamination of solder and the excessive inclusion of oxides in the molten tin, resulting in a brittle solder joint structure. Another reason is that the composition of the solder used in the processing and manufacturing process has changed, resulting in excessive impurity content and the need to add pure tin or replace the solder.
4. PCB solder joints turn golden yellow
The main reason for this problem is that the temperature is too high, and at this point, only the tin furnace temperature needs to be lowered.
5. Poor boards are also affected by the environment
Extreme temperature or temperature fluctuations, high humidity, high intensity vibration, and other conditions are all factors that can lead to reduced or even scrapped board performance.
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