PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
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?

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.