插上电源后键盘左下角就吱吱的发出响声，拔掉电源后就不响了！响声是间断周期循环的嗯嗯声。
请问是什么原因，求帮助！
After plugging in the power supply, the lower left corner of the keyboard squeaks and makes a noise, and when the power is unplugged, it does not ring! A boom is a muttering sound that loops in an intermittent cycle.
Please ask what is the reason, please help!
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