What Caused The Circuit Board To Burn Out?
During the PCB board design and board production process, engineers not only need to prevent PCB boards from being accidentally encountered during the manufacturing process, but also need to avoid design errors. Before we get into PCBA failure analysis techniques, let's take a look at some of the reasons why a circuit board can burn. Burnt circuit boards are not necessarily defects themselves, they are often caused by other inconsistent components or defects on the PCB. Let's find out what causes the board to burn out.
1. Extreme temperatures or moisture in the air
Due to the structure of the PCBA itself, when it is in an unfavorable environment, it is easy to cause damage to the circuit board. Extreme temperatures or temperature changes, other conditions such as excessive humidity and high levels of vibration are factors that can lead to reduced performance or even scrapping of circuit boards.
For example, changes in ambient temperature can cause circuit board deformation. This can break solder joints, bend the shape of the board, or it can also cause the copper wires on the board to break. Most electronic components do not function well above 70°C, so designing for high temperature applications is tricky but necessary. Otherwise, the components will be burned out, and in severe cases, the entire machine may be burned down.
On the other hand, moisture in the air can cause oxidation, corrosion and rust on metal surfaces such as exposed copper traces, solder joints, pads and component leads which in turn can cause wear on solder or metal parts, causing component leads to break, resulting in Short circuit or burnt circuit board.
2. Improper spacing of components
The components are packed too tightly together on the printed circuit board, because there is no excess space between the two connected circuit boards, which tends to heat up the components, which will cause friction during transportation, shaking, or high temperature. Affects adjacent components. Therefore, you need to wrap the circuit board with anti-static packaging and isolate the components.
If the components are too close to each other, components without the necessary space will also affect the adjacent components as the temperature rises, which needs to avoid overfilling the board. Not only will this reduce costs and speed up production, but it will also help you avoid any costly mistakes that could haunt you later.
3. Component failures and technician errors
The most important part of PCB assembly is the design stage, so if something goes wrong in the design stage, it is likely to cause the board to fail or burn later. So checking during assembly to ensure the correct diodes and capacitors are specified for the board will reduce the likelihood of burnout associated with component failure.
The circuit board can burn out due to poor protection. Lack of properly sized fuse protection. High voltage protection diodes protect the board from burnout in the event of lightning strikes or other voltage surges.
Other causes of board burn are related to technician error. If the board is wired incorrectly or connected to the wrong type of power supply, it will eventually burn out. Also, if the installation files are messy or non-existent, the field technician may connect the boards incorrectly.
Therefore, there are still many reasons for the circuit board to burn, and professional personnel are required to avoid these factors. As a professional electronic manufacturing service provider, Tecoo has more than 20 years of manufacturing experience in this industry. We will use our professional knowledge to help customers avoid these problems, save customers' time and capital costs, and shorten their time to market.
