Replace the new host and large screen in turn, simulate the operation when the fault recurs, run bumpy roads to verify if necessary, and check the single-piece problem of the host and large screen with normal functions; secondly, check the physical structure of the terminal with the naked eye, and crimp the terminal with the help of electronic equipment. Analysis, characteristic impedance test, the characteristic impedance difference caused by the insufficient crimping of the locking terminal, which leads to the mismatch of the characteristic impedance of the display system, which leads to the abnormality of the system.