U generally stands for integrated circuit, but also ic.

V stands for transistors, diodes, triodes, etc.

R stands for resistance

C stands for capacitance

L stands for inductance

J is for socket

TP stands for detection point

F stands for insurance. for example. For example, R stands for resistor, Q stands for triode, etc., indicating the function number of the circuit.

R117: Light Emitting Diode

LAMP, C stands for capacitor; thirdly, D stands for diode, and the four digits represent the serial number of the same device on the circuit board; the second is a number, such as "1" representing various symbols on the motherboard circuit board. Meaning: resistance on the motherboard, in general, the first letter identifies the device category: transformer on the motherboard, "2" means power circuit, etc.: transistor: emitter, which is determined by the circuit designer, The serial number is 17,C).

Extended information
The names of circuit boards are: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board Thin circuit boards, printed (copper etching technology) circuit boards, etc. The circuit board makes the circuit miniaturized and intuitive, and plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances.

The circuit board can be called a printed circuit board or a printed circuit board, the English name is (Printed Circuit Board) PCB, (Flexible Printed Circuit board) FPC circuit board (FPC circuit board, also known as flexible circuit board Flexible circuit board is based on polyimide It is a highly reliable and excellent flexible printed circuit board made of polyester film as the base material.

It has the characteristics of high wiring density, light weight, thin thickness and good bendability. ) and soft and hard combination plate (reechas, Soft and hard combination plate) - the birth and development of FPC and PCB, gave birth to the new product of soft and hard combination plate. Therefore, the flexible and rigid board is a flexible circuit board and a rigid circuit board, which are combined according to the relevant process requirements after pressing and other processes to form a circuit board with FPC characteristics and PCB characteristics.