The
components need to meet two conditions: the first is the voltage, the second is the frequency. The motherboard power management chip is responsible for the voltage provided to the various chips in the motherboard. Generally, when a bad motherboard is placed in front of us, the first thing we detect is the motherboard power management chip to see if the chip has an output voltage. Motherboard power chip how to judge good or bad? The judging steps of the mainboard power management chip are as follows: 1. First of all, the CPU will not work after the mainboard power chip is broken, that is, the CPU will have no temperature after the mainboard is powered on, at this time, you can use the diode file of the meter to test the inductor and the resistance value of the ground. If the meter drops and then the resistance gradually rises, it proves that the power chip is good. On the contrary, if the resistance value is 0, it proves that there is a problem with the power supply part. How should we deal with this problem? At this time, we can take down the power regulation tripole next to the CPU foot, and if the inductor is still short circuited to the ground, it is judged to be the problem of the power chip. 2. If the peripheral power supply is normal, but the power chip voltage is abnormal. Then judge by the voltage of the key points of the peripheral circuit, first check the voltage of the G pole of the next effect tube. In addition, it can be judged by the ground resistance value of the peripheral circuit, such as whether the resistance value of the G pole resistance is the same. If the peripheral circuit is normal, this time you can use the replacement method to determine the quality of the motherboard power management chip
dh8302 power chip judge method: First observe whether the corner of the eye is normal, whether the corner of the eye is broken, and then use a multimeter to the resistance level to measure whether the pin of the power chip chip has short circuit, if there is a short circuit indicates that the chip has been damaged internal damage, at this time this chip can not be used in normal, need to replace a normal chip to replace.