Power Supply Failure in a Toshiba L300
A failed or failing Toshiba L300 laptop's power adapter can result in charging and power problems. Although the power adapter is usually the source of power issues, in some cases, a separate issue such as malware infection or outdated BIOS files can result in improper use of the AC adapter, requiring file updates and scans to correct the problem. Troubleshoot the adapter thoroughly to verify that it truly is the problem before replacing it.
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Symptoms
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Symptoms of a failed or failing power adapter include no charging or intermittent charging when it's plugged in to your laptop. Also, the brick in the middle of the cord may emit a strange noise or feel hotter than normal. Additionally, the LED on the brick may not light up at all, indicating the cord is not receiving electricity.
Causes
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The brick in your adapter cord contains circuit boards and wiring to convert the high-voltage house current to the lower current required by your Toshiba. If these circuit boards are damaged as a result of a power surge or rough handling, they can't correctly convert or direct the electricity to the laptop. Frayed wiring inside the cord or severe kinks may also cause charging problems, as these issues interrupt the flow of electricity. A faulty battery can prevent the laptop from seeing the AC adapter properly, and a broken adapter jack cannot direct the electricity supplied by the cord to the rest of the laptop.
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Troubleshooting
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If you're certain the outlet your laptop is plugged into works, check the voltage output of the adapter with a voltmeter and compare the readings to the specified voltage listed on the brick's label. If the readings fluctuate more than a few volts one way or the other, the cord is faulty. Also, check all the connections on the cord, making sure the end of the cable connecting to the laptop, the part of the cable connecting to the brick and the plug connecting to the AC outlet are all firmly connected; loose connections can result in power not being transferred.
Replacement
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If your Toshiba L300 laptop's power cable is found to be defective or damaged, you can purchase a replacement cable from Toshiba or purchase a generic power cable that's compatible with your laptop's required voltage and connector shape. Most retailers offer information for laptop compatibility when advertising their third-party adapters, so match the listed compatible part numbers to find the correct replacement.
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