Case:
Customers took a 4GB USB flash drive to restore data, and the disk was suddenly unable to recognize when it was used normally.
Solution:
The U disk has been processed when it has been hand, and the welding of storage IC is crookedly welded on the pad.The failure point of the U disk is actually not much, that is, the main control IC storage IC and the stone crystal. These three are the most prone to problems.Because the main control has no welding traces and the user reports that only the storage IC has been replaced, the user is clear.At this point, the possibility of being replaced by the master control is to find the main control of the matching. Because the electric board is replaced directly at hand, the crystal of the bad board is directly used.The voltage of the crystal oscillator (Actually this is a waveform, the main role of the crystal is to pick up the waves. It is best to use a display wave meter. It does not matter that the voltage of the two feet is basically the same). It is found that the voltage of the two feet is abnormal.It is normal to replace a new crystal directly.100%recovery.