How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?
Factors that affect the Price of FPCB
What information is required for SMT processing at PCBA factory?
Skills of using 0ohm resistor in PCB design
How to select a PCBA manufacturer
SMT processing solder joint quality inspection
Characteristics difference between immersion gold PCB and gold plating PCB
Common malfunctions of Circuit Board Caused by Moisture
A Few Rules about PCB Panelization
Compare of multi-layer PCB with single/double layer PCB
Why do we need to introduce so many subdivided GND
Difference between immersion gold boards and gold plating boards
Aluminum PCB structure
Classification of different GND in circuit
Why PCB baking is necessary during manufacturing process
The handle and precautions of OSP board in SMT process
How to choose capacitors for filter decoupling
How to choose filter capacitor for switching power supply
5 database need for SMT process
Function of three-terminal capacitor
Introduction of PCB OSP surface treatment
Method of inspecting the quality of SMT by step
How to find the short point between VCC and GND
Difference between 850nm and 940nm infrared LED
Component layout of PCB SMT DFM
Pad shape influence on the strength and reliability of the soldering joints
The difference between high temperature solder paste and low temperature solder paste
Introduction to manual welding processing
Manual visual inspection in PCBA processing
Characteristics of the conformal coating process
Difference between hardware engineers and software engineers
PCBA processing operation rules
China PCB upstream materials has continued to soar
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The key points of quality control in PCBA processing
Common causes of solder beading during SMT process
Analysis of the advantages and disadvantages of HASL PCB surface
Requirements for layout of components during SMT assembly
Selection of electronic components and CCL for PCBA
Performance and appearance quality inspection of components.
Quality and Reliability of SMT Chip Processing and Production
Coupling and decoupling function of capacitor
Two methods to connect digital ground and analog ground
Common sense in SMT process

Common malfunctions of Circuit Board Caused by Moisture

When manufacturing PCB boards, there are often some common malfunctions of circuit boards caused by moisture. The changes of circuit parameter, the short of boards and the circuit-break at the time of signals handling all result in circuit boards malfunctions.

The definition of moisture is containing more water than that in the normal condition. Thus, the circuit board used in the moist environment, because the air contains comparatively large moisture, when the moisture is too large, it will turn into drops of water and fall off to the board. When the drops of water fall off to the board and disperse on the board, they will attach to each pin or line of the electronic component or PCB.

Because the applied electronic components at present are all SOP or SSOP SMT components, and the distance between pins is quite tiny, especially the SSOP packaged integrated circuit, so when moisture turns into drops of water and drops into the pins of the integrated circuit, if the circuit board is in an operating state at the moment, it will add an invisible resistance between the pins of the integrated circuit (Because water is conductive), and even leads to circuit-short and causes the circuit board in running to malfunction status.

If the drops of water turned by moisture drops into the pins of the electronic components in the circuit board, and the circuit board is just in the state of non-work or power-off, though it will not cause damage immediately, after the pins or printed lines are soaked by the drops of water, the pins of the components will rust, and over time, the pins will break and give rise to the circuit boards malfunction because of the rusting. When the printed lines are soaked by the drops of water, especially that the signal-convey lines are comparatively fine and after they are soaked for a period of time, there are situations that the printed lines will mould and break, which will result in such situation that the circuit board can’t work after being in use again.

For the reasons for malfunction of the circuit board caused by moisture, here are three pieces of conclusion:
1. The changes of circuit parameter will give rise to malfunction of circuit board;
2. The short of circuit board will result in malfunction of circuit board;
3. The break of signals handling lines of circuit board will lead to malfunction of circuit board.

You could make related measures according to the three pieces of conclusion for reducing or avoiding the situations that malfunction of circuit board you are in charge of caused by moisture.