Rosewill Computer Case 422 Technické informace stáhnout pdf (Strana 69)

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Chapter 4 • Disassembly and Power

Table 4.6 Sample computer component power requirements

Component Power consumption

Motherboard (without processor) 5 to 150W

Processor 10 to 140W

Floppy drive 5W

PATA hard drive 3 to 30W

SATA hard drive 2 to 15W

Optical drive 10 to 30W

Non-video adapter 4 to 25W

AGP video adapter 20 to 50W

PCIe video card with one power

connector

50-150W

PCIe video card with two power

connectors

100-300W

Extra fan 3W

RAM stick 15W

Different physical sizes of power supplies are available. When replacing a power supply,

purchasing a power supply for a new computer, or upgrading a power supply, verify that the

power supply will fit in the computer case. Also, verify that the power supply produces enough

power for the installed devices and for future upgrades. Do not forget to check that the on/off

switch on the new power supply is in a location that fits in the computer case.

When purchasing a new power brick for a laptop or battery for a mobile device, ensure that

it has the same specifications as the one from the manufacturer. Less expensive models might

not provide the same quality as approved models. Ensure that the replacement has a power

jack that does not wiggle when it is inserted into the device. Ensure that a laptop power brick

has the appropriate DC voltage required by the laptop. Current (amperage) should be equal to

or more than the original power brick.

Power management on both laptops and desktops is important. Most computer compo-

nents are available as energy-efficient items. ENERGY STAR is a joint effort by the U.S. EPA

(Environmental Protection Agency) and Department of Energy to provide device standards and

ratings that easily identify products (including computer components) that are energy efficient.

Many computers today are on more than they are off, and settings such as power options, CPU

throttling, and some advanced BIOS settings affect power settings. A technician must be aware

of all these options and be willing to offer advice such as turn the computer off when finished

working on it; set the power management option to allow work to be performed at an afford-

able cost; disable options not being used, such as wireless capabilities when wired networking

is functioning; be aware of monitor costs (CRT-type monitors take the most energy, followed

by plasma displays and then LCD or flat-panel technology); and purchase energy-efficient parts

and computers.

Symptoms of Power Supply Problems

The following is a list of symptoms of a power supply problem:

• The power light is off and/or the device won’t turn on.

• The power supply fan does not turn when the computer is powered on.

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