What is the role of U disk components

U disk's structure is relatively simple, mainly by the USB plug, the main control chip, voltage regulator IC (LDO), crystal oscillator, Flash (Flash), PCB board, SMD Resistor, capacitance, light-emitting diode (LED) and other components. Here are some of their respective roles.

USB plug: Easy to appear and circuit board virtual welding, causing U disk can not be computer recognition, if the power supply foot virtual welding, will make U disk plug 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.

Voltage Regulator IC: Also known as Ldo, its input 5V, output 3V, some of the inferior u disk voltage Regulator IC is very small, 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 no 3V output, 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.

Also some u disk will be in usb+5v and voltage regulator IC string a 0 ohm protection resistor, at this time voltage regulator IC no 5V input voltage is it bad. Now many of the main control will be integrated into the main control Ldo, so we will see many U disk have no external Ldo, they are usb+5v voltage direct input. This situation will change the master control.

Crystal oscillator: The early U disk is mostly used 6M crystal oscillator, now the U 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.

Master chip: The main control chip is responsible for flash and USB connection, is the core of U disk, we generally refer to the U disk program is the main control chip model. The mass production tool is also corresponding to it. Some of the main control chip also to input 3V voltage to flash power supply, to ensure the normal operation of Flash.

Flash Pad: Its function is to fix the flash memory, so that the flash is connected with the master control. By external pressure after easy to make flash memory and solder disk contact bad, this will cause 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 repaired, that is, we often say that the drag welding.