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1. Check the DELL 74X5J AC adapter indicator light, if the indicator light, generally think there is no problem from the power to the DELL 74X5J adapter, you must ensure that the light itself is not damaged.
2. Check whether the DELL 74X5J power adapter to the computer is power.This can be indicated by the notebook's indicator light, when the DELL 74X5J power is charged to the laptop, that charging indicator light will be bright, otherwise it will not light.or Find a same brand of power adapter exchange Try the same brand of power adapter with your DELL 74X5J power adapter laptop, if the other computer is working properly, then your DELL 74X5J power adapter is no problem otherwise your power adapter may have problems if the other side of the power adapter plugged into your computer, your computer Working well, but using your own power adapter does not work, then your power adapter has a problem.
3. Check the computer light changes. If you plug in the DELL 74X5J power adapter, you can see the charging light sometimes bright sometimes off, or always bright, it is the laptop inside the power adapter interface problems, the general may Inside the line is broken, the circuit board aging, welding drops and other reasons.This is called Weld phenomenon.This situation only called experts to repair.
Take my DELL laptop as an example. The indicator of the DELL 74X5J power adapter is normal, and when the power is plugged in, the computer can normally spend about an hour, and then it will be powered off automatically. It is observed that the indicator of the power adapter is on and the laptop can sometimes Charge to power, sometimes can not charge.
Considered from two aspects, first, there is a problem with the DELL 74X5J AC adapter contact, sometimes power, and sometimes can not. I borrowed a similar brand of AC adapter to try and found the same phenomenon, and my DELL 74X5J power is normal in other laptops So ruled out the problem of the AC adapter itself.Therefore, this is a problem of laptop.It was later found on the laptop charging indicator flashes off, and sometimes has not flash, causing the laptop due to not charging, the battery runs out and Automatically shut down. This flash off a note here laptop interface is not good, there may be broken. Later, sent to the DELL repair shop to check, it really is a problem with the laptop power interface.
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