source:Industry News release time:2022-04-12 Article author:yu Popular:pcb
1. Short circuit
Common short circuits include: when the space or spacing between copper traces is very small, a short circuit will occur; untrimmed component leads will cause a short circuit; floating in the air can lead to short thin wires, which will cause a short circuit between copper traces, etc.
2, solder bridge
Component Failure: A defective component typically shorts its input or output to power or ground.
3, open circuit
An open circuit occurs when a trace breaks, or when the solder is only on the pad and not on the component leads. In this case, there is no adhesion or connection between the component and the PCB. Just like short circuits, open circuits can also occur during production or soldering and other operations.
3. Looseness or dislocation of components
Including insufficient board support, reflow oven settings, solder paste issues, human error, etc., causing vibration or bounce of components on the soldered PCB board.
4. Welding problems
(1) Disturbed solder joint: The solder moves before solidification due to external disturbance.
(2) Cold Soldering: This happens when the solder does not melt properly, resulting in a rough surface and unreliable connections.
(3) Solder Bridge: This happens when solder crosses and physically connects two leads together.
(4) Others: Insufficient wetting of pads, pins or leads; too much or too little solder; raised pads due to overheating or rough soldering, etc. Author: CITIC China PCB
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