The clock crystal oscillator circuit and the resonant circuit capacitor are damaged. After the damage, the current and voltage of the two pins of the crystal oscillator are abnormal, and the output of the clock chip is abnormal. When there is current and voltage but no waveform, all motherboards will have no clock and no reset. When the working frequency deviates, there may be problems that the CPU cannot be installed, the system cannot be installed, the system cannot be accessed, the blue screen of crash occurs during operation, the CPU frequency is incorrectly distinguished, or even the old CPU runs normally and the new CPU does not run. .
The failure rate of the building bell circuit is not very high on the main board, and sometimes it is not component damage after damage. False soldering and excessive oxide layer will cause the crystal oscillator to run abnormally. Adding welding method to solve the problem of crystal oscillator is a form that people often use. The failure rate of power distribution equipment and crystal oscillator is relatively low, while the clock is running or running. The slowness of the clock may be due to the interference of the topography of the clock; the pendulum adjustment screw is loose; the clock tube and the clock are closely matched and loose, causing the needle to slip; When the situation arises, we can remove the screws, put a piece of rubber or wood up and down, and make the slot parallel to the workbench, and then hit it with a hammer to make it slightly bent, fit tightly, and clamp it with pliers. Use hand pliers to look down at the 4 spring claws and raise the total height. It is stipulated that the 4 heights are the same, the friction torque is 0.2-0.5N.m, and the rotation should be stable.
