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Teach you how to repair the motherboard serial port fault

2018-01-02 16:00:00
Source :U master U disk installation system often use the computer, will inevitably encounter this or that problem. When the serial port of the motherboard fails, how do you solve it? Let's learn the detailed tutorial together! 1. Check whether the socket of the serial port is faulty or broken. If yes, weld the socket again. 2. When the serial port socket is normal, measure whether the ground resistance of the data line between the serial port socket and the serial port management chip is 1000~1700 euros, and the ground resistance of all data lines should be roughly the same data. 3, if the earth resistance value is abnormal, then we will detect whether the filter capacitor and other components in the line are normal, if it is abnormal, then it is necessary to replace the damaged components. 4. When the filter capacitor and other components are normal, we can check whether the power supply of the serial port management chip is normal. If it is not normal, then the voltage regulator diode and other devices connected to the power supply pin of the serial port management chip are good or bad. 5. If the power supply of the serial port management chip is normal, the serial port management chip may be damaged. Replace the serial port management chip. 6. When the ground resistance value of the data line between the serial port socket and the serial port management chip is normal, then we have to measure whether the ground resistance value of the line between the serial port management chip and the south bridge or I/0 chip is the same, if different, remove the serial port management chip, and then measure whether the ground resistance value is the same, if it is still different, then the south bridge or I/O chip is damaged, if it is the same Then the serial port management chip is damaged.
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