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Can u disk chip be repaired if it is broken Can u disk chip be repaired 1. There is no reaction when u disk is inserted into the machine Maintenance idea: according to the fault phenomenon judgment, the U disk machine is not working, and the conditions that the U disk tool should have is the key point of our maintenance. No matter the USB flash disk of any scheme wants the tool, it must have the following conditions: (1) power supply, divided into the power supply required by the main control and the power supply required by flash, these two are the key, and the U disk circuit is very simple. If there is no power supply, it is generally damaged by the safety inductance or the 3.3V voltage regulator block. When it comes to the voltage stabilizing block, it has three pins, namely, power input (5V), ground, and power output (3.3V) ）The working principle is that when the input pin inputs a 5V voltage, the output pin will output a stable 3.3V. As long as we find out where the root cause of the lack of power supply, the problem will be solved very well. (2) clock, because the master control can work at a certain frequency, and the communication with flash also needs to transmit the clock signal, so if there is no clock signal, the master control will not work. When checking this circuit, in fact, the clock generation circuit is very simple, only need to check the crystal oscillator and its peripheral circuit. Because the crystal oscillator is afraid of brush and the U disk is small, it is easy to fall on the ground and cause damage to the crystal oscillator. As long as you replace the same crystal oscillator. Note: crystal oscillator can not be measured, the good way to judge its quality is to replace a good crystal oscillator to judge. (3) master control, if the above two conditions are normal, then the main control chip is damaged. Just replace the master. 2. The USB flash disk is inserted into the computer, indicating "unrecognized device". Maintenance idea: for this phenomenon, the first point is that the circuit of the U disk is basically normal, but there is a fault in the communication with the computer. For the communication, there are the following points to check: (1) U disk interface circuit, there is no special component in this circuit, that is, two data lines D + D -, so when checking this circuit, as long as the line between the data line and the main control circuit is normal, two small resistance values will be connected in series between the data line and the main control circuit to play a protective role. Therefore, it is necessary to check whether the resistance values of these two resistors are normal. (2) clock circuit, because the communication between the USB flash disk and the computer must be carried out at a certain frequency. If the working frequency of the U disk and the computer can not be synchronized, the system will consider it as an "unrecognized device". Now it's time to change the crystal oscillator. There are many cases of crystal oscillator damage in actual maintenance! (3) master control, if the above two points are normal, it can be judged that the main control is damaged. 3. You can recognize the U-disk, but you will be prompted "the disk has not been formatted" when you open it, but the system can not format it, or you will be prompted "please insert a disk". When you open the U disk, there are random codes and the capacity does not match itself. Maintenance idea: for this phenomenon, it can be judged that the hardware of the U disk itself is not too big a problem, only a software problem. Solution: find the repair tool of master control scheme and do it. This is up to you to see what the main control scheme of the U disk is to decide. What do you think of U disk chip model 1. First, plug in the USB flash disk that needs to be tested, and then run the chip worry free or chip wizard software. 2. In the test results display page, select the relevant information, and directly click the right mouse button to copy the test information results. In the detected information results, the chip model information is mainly concerned. 3. With the U disk master chip model information, you can find the mass production tools of the master chip model, but you can also use another method to find Oh, that is, flash memory wizard. Input the main control chip model of U disk to get the detailed information of the main control chip of the model. In many cases, if the software does not match the main control chip model of the U disk, the mass production of the U disk cannot be continued. Therefore, it is very important to accurately obtain the model of the main control chip of the U disk. It is necessary to prepare for the mass production users of the U disk. |
