Originally, the copper foil was covered on the entire circuit board and partially etched away during the production process, and the substrate of the circuit board itself was made of a material that was insulated and not easily bent. The surface layer can see that the small line material is copper foil. What remains is a network of tiny lines. These lines are called wires or wires and are used to provide circuit connections for the parts on the board. Usually the color of the circuit board is brown or green, which is the color of the solder resist paint. Insulating protective layer that maintains copper wire and prevents parts from being soldered to the wrong place.
The area of the wiring board can be added to a large level. Multi-layer boards use more single or double-sided wiring boards, and today’s graphics cards and motherboards are multi-layer boards. And put an insulating layer between each layer and press it together. The number of layers of the board represents several separate layers of wiring. Usually the number of layers is even and contains the outermost two layers. The rare board is usually a 48-layer layout. The number of layers on many boards can be seen by looking at the cut surface of the board. But in fact, no one can have such a good eye. So, let’s teach us a way.
Most of the main board and display card use the 4-layer circuit board multi-layer board circuit connection is through the buried hole and blind hole technology. Some also use 68-layer or even 10-layer boards. To see how many layers are on the board, you can identify the hole through the investigation. Since the 4 layers used on the motherboard and the display card are the 1st and 4th layers, the other layers have other uses. And the power supply) So, like the double-layer board, the guide holes will break through the board. If some of the guide holes are presented on the front of the board, but they are not found, then they must be 6/8 layers. If the board is not the same, you can find the same hole. Naturally, it is a 4-layer board. See the orientation of the guide hole, and point the main board to the light. If it can transmit light, this is 8/6 layer, otherwise it is a four-layer board.