What are the important components of a U disk?

U disk's composition structure is relatively simple, mainly by USB plug, crystal oscillator, the main control chip, voltage regulator IC (LDO), PCB board, SMD resistor, capacitance, Flash (flash), light-emitting diodes (LED) and other components. Also some u disk will be in usb+5v and voltage regulator IC string a 0 ohm maintenance resistor, now voltage regulator IC no 5V input voltage is it bad. Today many master control will LDO integrated into the main control, so you will see many U disk have no external Ldo, they are usb+5v voltage direct input. This situation will change the master control.

　　Voltage Regulator IC

Voltage regulator IC also known as Ldo, its input 5V, output 3V, some of the inferior u disk voltage Regulator IC is very small, it is easy to overheat and burned. There is also a USB power supply will also cause voltage regulator IC burned. The input voltage and output voltage can be measured by multimeter when maintenance. If there is no 3V output, it may be the voltage regulator IC is broken. But there is a situation, the output voltage is low, and the main control hair hot, at this time is the main control burned

　　Flash Solder Plate

Flash pad Its role is to fix the flash memory, so that flash memory with the main control interface. After kneading by external force simple flash memory and solder disk contact bad, then will form the computer on the U disk can not open, unable to store files. As long as the flash memory to repair the pin welding can be fixed, that is, we often say that the drag welding.

　USB plug

USB plug more prone to problems and circuit board off welding, causing U disk can not be computer recognition, if it is the power supply foot virtual welding, will make u disk plugged into the computer without any reflection. Sometimes the U disk shake the computer can be identified, you can determine the USB socket contact bad. The problem can be solved simply by mending the weld.

　　Main control Chip

Master chip main control chip as a flash and USB connection, is the center of U disk, we usually say the U disk program refers to the type of master chip. The mass production of Things is also corresponding to it. Some of the main control chip also need to input 3V voltage to flash power supply, to ensure the normal operation of Flash.

　Crystal oscillator

The early time of the crystal U disk is mostly used 6M crystal oscillator, now USB disk is commonly used 12M crystal oscillator. Crystal is not resistant to fall, so it is a U disk on the vulnerable parts, the best maintenance method is to use the same frequency of crystal oscillator direct substitution.