The indicator light of Lenovo notebook plugged in the power adapter is very weak. What happened?

According to you, the problem may be a glitch in the adapter. The adapter is actually a charging device and the indicator light is a light-emitting diode. When the computer is not connected, the input terminal voltage is higher than the output terminal, and the current naturally flows to the non-resistance side, and the indicator light is on. When the computer is connected, the transformer of the adapter changes alternating current into DC. Due to the fault, the output voltage is lower than the rated input voltage required by the computer, so that the output voltage is lower than the rated input voltage of the computer, and the current cannot flow through the line normally, so there is no input, just like a water pipe. In addition, you can rest assured that it will not discharge even if it cannot be charged, because the diode of the adapter controls one-way power supply. Even after the warranty period, it will not be too expensive.