In the past when the power adapter has a squeaky sound. Now plug in the power supply adapter will be squeaky. Power on a while to power, and power indicator light does not shine, power adapter silent. Put a while the power adapter connected to the power there will be squeaky. And can make the computer boot. Boot a power supply and no response. I wonder if the power cord is broken or the adapter is broken?
AC adapter is definitely a problem with the universal test off ah
If there is no sound before the power adapter, and then there is a voice, it may be due to the internal solder joint solder joint, poor contact
If there has been a voice before, it may be switching power supply transformer design unreasonable, issued by the audio noise.
In short, it should be your adapter problems, if there are electronic, especially the switching power supply to understand the friends, you can also let others repair. But the best is you to buy one, something is not expensive, with the Worry, you can buy Taobao like a fifty or sixty, twenty or thirty can use, but it is estimated that electromagnetic interference may be more serious
1, you can put the laptop power cord adapter to take out the line, replace and then connect the laptop, if the normal charge, then the power adapter is out of the cable,
2, the adapter out of the outlet line, with a multimeter test adapter power output pile, if there is voltage, the adapter intact, if the output pile without voltage, then the adapter is damaged.
