Pcb multilayer board number and maintenance

PCB multilayer board number and maintenance

Nowadays, PCBs are very common in life. Boards are important carriers of large-scale integrated circuits. There was a mistake in the DIY world before: "The more layers, the better". However, this is not the case. The increase in the number of PCB layers is actually a helpless move. Due to the size limitation, double-sided wiring cannot meet the demand, so more layers of PCB boards are needed to support it. Multilayer PCBs have higher costs, which is not conducive to making more cost-effective products.

Pcb multilayer board

This is generally used to identify the number of PCBs

With the progress of science and technology, the degree of integration is getting higher and higher, the number of layers of the main board PCB is gradually decreasing, and the materials that need to be "stacked" are also beginning to be highly integrated. Think about the size of the TV that used to be "hot and big", but now the LCD TV has achieved a very thin and better display effect (ignoring the difference between the picture tube and the LCD technology here), and the DIY industry is the same.

Side of excellent PCB

There is a difference between PCBs. At present, mainstream PCBs use glass fiber as the main raw material. The identification method is very simple. The side is very flat and not rough. This is a better PCB. If you see a PCB that is very rough and may be made of fire-resistant cardboard, please use this motherboard to draw the face of the shopkeeper (you should bear all the legal consequences caused by this, and the author is not prepared to bear any responsibility). I'm sorry I didn't find the profile photo of the refractory cardboard PCB.

Click to view the side effect of the motherboard PCB

Oh, yes, a good PCB is not necessarily very hard, but it must be very flexible, and it can quickly recover to its original state after gently bending, without brittle cracks and deformation. Of course, if you are strong, the author does not recommend that you check the strength of the motherboard in this way, which is likely to cause damage beyond the free warranty.

How to maintain pcb circuit board

PCB maintenance is a new repair industry. In recent years, the degree of automation of PCB industrial equipment is getting higher and higher, so the number of various industries is also increasing. After the industrial control board is damaged, the high cost of replacing PCB circuit boards (from a few thousand yuan to tens of thousands or hundreds of thousands of yuan) has become a headache for enterprises. In fact, the vast majority of these damages can be repaired at home, and the cost is only 20% - 30% of the cost of buying a new board, which also takes much less time than that of ordering a board abroad. The following describes the basic knowledge of circuit board maintenance.

Circuit board

Almost all circuit board maintenance has no drawings and materials, so many people are skeptical of circuit board maintenance. Although various circuit boards are different, what remains unchanged is that each circuit board is composed of various integrated blocks, resistors, capacitors and other devices. Therefore, circuit board damage must be caused by the damage of one or some of the components. The idea of circuit board maintenance is based on the above factors. The circuit board maintenance is divided into two parts: detection and maintenance, in which detection occupies a very important position. Check the basic knowledge of each component on the circuit board until the bad component is found and replaced. Then a circuit board is repaired.

Circuit board detection is the process of finding, determining and correcting the faults of each PCB component on the circuit board. In fact, the whole testing process is a thinking process and a testing process that provides logical reasoning clues. Therefore, testing PCB engineers must gradually accumulate experience and constantly improve their level in the process of circuit board maintenance, testing and overhaul.

General electronic equipment is composed of thousands of components. It is time-consuming and difficult to detect problems by directly testing and checking each component in the circuit board one by one during maintenance and overhaul. Therefore, it is an important maintenance method to set the number to the seat from the fault phenomenon to the fault cause. As long as the circuit board detects the problem, it is easy to repair.