You have a laptop that appears to charge properly when connected to AC power. The battery charger indicator light shows that it is charging for hours before changing to green “full charge” indicator light. However, once the laptop is removed from AC power the system stays running for only a few minutes before powering down while in use. What is the most likely reason for this issue?
One of the computers in your lab is having problems with power, and you suspect that the issue is related to the voltage provided at the power outlet. What tool can help you diagnose the exact voltage at the outlet and inside the computer?
The power supply of your computer lists these specifications on the label:
You’re installing a SATA drive into a computer, and you notice that the drive contains two different power connectors. One of the power connectors is the traditional four-pin “Molex” power connection, and the other is the newer SATA power interface. Which one of these power connections should be used for your hard drive installation?
Your laptop includes some power-down options, including one that can halt the operation of your computer but keep the CPU and memory powered. What power-down mode is this?
During normal troubleshooting of a desktop computer, you suspect that the power supply may not be providing enough output to support all of the installed peripherals. What tool can you use to test the output of the computer’s power supply?
You’ve pressed the power switch to a computer, but there are no sounds or lights coming from the system. You’ve checked the power outlet with a multimeter, and the outlet is properly powered. You’ve also checked the end of the power cord that inserts into the power supply, and the power cord is properly powered. What’s the next step to help troubleshoot the problem?
Which one of these things can NOT be done with a typical multimeter?
Power is an important part of every computer system in the world, and every CompTIA A+ certified professional should be able to understand, specify, and troubleshoot power problems in any environment.
Troubleshooting power problems with personal computers goes well beyond the power cord. In this module, we’ll show you how to use a circuit tester and multimeter to troubleshoot power on the motherboard , the PC components, and the power outlets themselves. You’ll also learn about power protection systems and the process for installing a PC power supply.
