The electrical properties of the safety capacitor are degraded or damaged by breakdown.
The common status is
1. The voltage exists and the current is less than 400 mA
In this case, the USB device is not running normally and cannot charge and read normally every time. Take
For example, if the mouse shakes and shakes, the mouse light effect cannot be turned on normally
2. The voltage and current are almost 0.
In this case, once the USB device is plugged in The computer is running wildly while it is being recognized but it cannot be recognized or it does not respond at all
This means that your capacitor is either about to end its lifespan
or it means that your USB is short-circuited
Contacted with water
Plug in a short-circuited device or data cable power cord and not unplug it for a long time
The safety capacitor protected your motherboard once and was sacrificed
< p>In fact, it does not affect the use of your motherboard1. PIC interface
2. External 5V HUB, the kind of external HUB with a transformer
3. Think The solution is to jump the mainboard transmission and power supply to the spare USB interface near the edge of the north bridge chip of the motherboard. It is probably a 9-pin pin interface. Even the most rubbish motherboards that cost 100 yuan will have a spare USB data interface and have independent capacitors
If 3 is difficult, I still recommend suggestions 1 and 2
In addition, if the mobile phone uses inferior wires and causes breakdown, it may not be able to charge normally or use electricity too fast. Once the breakdown occurs, the capacitor will leak. The same goes for the motherboard