Rosewill Computer Case 422 Información técnica descargar pdf (Pagina 70)

Solving Power Supply Problems

153

Disassembly

and Power

• The computer sounds a continuous beep. (This could also be a bad motherboard or a

stuck key on the keyboard.)

• When the computer powers on, it does not beep at all. (This could also be a bad mother-

board.)

• When the computer powers on, it sounds repeating short beeps. (This could also be a

bad motherboard.)

• During POST, a 02X or parity POST error code appears (where X is any number); one

of the POST checks is a power good signal from the power supply; a 021, 022, . . . error

message indicates that the power supply did not pass the POST test.

• The computer reboots or powers down without warning.

• The power supply fan is noisy.

• The power supply is too hot to touch.

• The computer emits a burning smell.

• The power supply fan spins, but there is no power to other devices.

• The monitor has power light, but nothing appears on the monitor, and no PC power

light illuminates.

Solving Power Supply Problems

When you suspect that the power supply is causing a problem, swap the power supply, make

the customer happy, and be on your way! Power problems are not usually difficult to detect or

troubleshoot.

Do not overlook the most obvious power supply

symptom. Start by checking the computer power

light. If it is off, check the power supply’s fan by plac-

ing your palm at the back of the computer. If the

fan is turning, it means the wall outlet is providing

power to the computer and you can assume that the

wall outlet is functioning. Check the motherboard for

LEDs and refer to the manual for their meaning. Test

the power outlet with another device. Ensure that the

power cord is inserted fully into the wall outlet and

the computer. If you suspect that the wall outlet is faulty, use an AC circuit tester to verify

that the wall outlet is wired properly.

On a mobile device that is running on battery power, check the battery charge icon

through the operating system. Try using the device on AC power. If it works on AC power, try

recharging the battery. If the battery does not recharge, replace it. Wiggle the AC power to see

if the connection is loose. Remove the battery for a moment and then re-insert it (and attach

AC power if battery power does not work). On a laptop, see if the power brick has a power light

on it and whether it is lit. Try a different AC adapter from the same manufacturer because AC

adapters are proprietary between laptop vendors.

If a mobile device or smartphone won’t power on after recharging the battery, remove the

battery for about a minute. Reinstall the battery and try powering on again. If the system will

still not power on, try powering on with the power cable attached. If the system works with the

power cable attached, the battery probably needs to be replaced.

The following troubleshooting questions can help you determine the location of a power

problem:

• Did the power supply work before? If not, check the input voltage selector switch on the

power supply and verify that it is on the proper setting.

• Is the power supply’s fan turning? If yes, check voltages going to the motherboard. If

they are good, maybe just the power supply fan is bad. If the power supply’s fan is not

turning, check the wall outlet for proper AC voltages.

Do not disassemble a power supply

Power supplies are not normally disassembled.

Manufacturers often rivet them shut. Even when

a power supply can be disassembled, you should

not take it apart unless you have a background in

electronics.

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