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The reason for the flashing of the USB Power adapter light

The reason for the flashing of the USB Power adapter light

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  • Time of issue:2022-01-20
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(Summary description)Generally, the indicator light of the USB Power adapter only shows whether the power supply is working normally. If there is a flashing fault, there may be several reasons, which may be caused by internal instability.

The reason for the flashing of the USB Power adapter light

  • Author:
  • Origin:
  • Time of issue:2022-01-20
  • Views:

(Summary description)Generally, the indicator light of the USB Power adapter only shows whether the power supply is working normally. If there is a flashing fault, there may be several reasons, which may be caused by internal instability.

Information

Generally, the indicator light of the USB Power adapter only shows whether the power supply is working normally. If there is a flashing fault, there may be several reasons, which may be caused by internal instability. At this time, the internal voltage is likely to be unstable. Or it is in poor contact with the socket. It is also possible that the external voltage is too high or too low, or it is more likely that the external short circuit or external overload causes repeated startup. Or if the output is normal but the indicator light is flashing, it may also be a problem with the display LED. These are the causes of USB Power The reason for the flashing of the adpater light.

USB Power adpater

When troubleshooting, first we use a multimeter to check whether the socket is normal, whether the power supply voltage is 220V, and the maximum does not exceed the range of 100-240V. If the mains voltage is abnormal, it is recommended to replace the use environment test.

1. Use a multimeter to check whether the output voltage and current of the USB Power adapter are consistent with those marked on the nameplate. If they do not match, and the mains voltage range is normal, it can be judged that the USB Power adapter is faulty and the USB Power adapter needs to be replaced.
2. If the above check is normal, if the powered device is a laptop, we can remove the laptop battery, do not connect an external USB Power adapter. Press and hold the laptop power switch for 5 seconds and repeat 3 times. After releasing the residual charge of the laptop, insert it separately. USB Power adapter, power-on test. If the powered product is other, you can refer to this method.
3. If the fault persists, we need to check the DC interface to see if there is any damage, such as looseness or appearance damage, it is recommended to replace the DC head and try.
4. There is a fault inside the power supply, which leads to the hiccups of the USB Power adapter, most of which are the failure of the filter capacitor, which can be replaced.

USB Power adapter indicator does not light up

1. If the indicator light on the USB Power adapter is not on, it may be that the adapter is not connected to the socket, or there is no power at the socket, or the adapter may be broken.
2. Check whether the external adapter is properly connected with the powered device, and whether the external USB Power adapter works normally. If no problem is found, it is recommended to take it to a professional maintenance point for repair or replacement of the power supply.
3. In addition, you can also use a multimeter to check whether the output voltage of the USB Power adapter is normal, whether the socket is loose, and then power off again to see if the fault can be eliminated, or all are normal but the lights are not on, so it may also be that the indicator lights are aging.
The indicator light of the USB Power adpater keeps flashing, then it is usually caused by the internal instability of the adapter. At this time, the internal voltage is likely to be unstable. In this case, it is recommended not to use the USB Power adapter. The reason for this is mostly the power quality failure. , such as the built-in rectifier large capacitor cracking or bulging, etc.
 

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