Near a friend sent to a computer, basic configuration: Intel M612 motherboard, Celeron 300 CPU, no-name sound card and a 4MB AGP graphics
fault phenomenon: when a to open the computer's external power supply, and sometimes yet to press the start switch on the chassis, the computer starts (occasional). In addition, the computer in the course, did not issue any warning, will suddenly restart
beats by dre, and the speakers the sound mixed with significant noise. if
troubleshooting
is a hardware setting conflict caused by the failure, then the computer should issue an error warning. has not ruled out re-install the system, computer failure; anti-virus processing of the system, no virus is found; double-check the computer's CMOS settings to normal.
preliminary judgment that the failure was poor contact caused by a hardware point of view, through the phenomenon of the principles of the easier issues first, look at the internal chassis, and found the inside of the chassis clean very good, basically there is no dust, then disconnect the drive, floppy drive, remove the sound card, graphics card view corresponding to the slot in the finger and the motherboard, the end of the poor contact or jack internal short circuit caused by metal debris when speakers current noise aroused my attention. disconnect the speakers, put on headphones, the current noise is still very large, it seems that is not the speaker's reason to view the sound card manual to know the sound card is a PCI sound card and hard wave table, though it is no-name, but the sound quality output not be such a low current noise come from? what is the link between the above symptoms?
Since the current noise in the speaker, then start with the power to start, the dissolution of the power, use the multimeter to measure current, voltage output is normal, and then unplug the power input connector on the motherboard, then surprised to find that the number of the second row of the right of the power plug plugged into the motherboard 1, 2 metal plug wire column be arc traces of burnt, and two metal plug wire has a slight bonding phenomenon.
failure analysis
because the power connector on the motherboard burned, although not the formation of the circuit, but caused by the interface resistance increases, the actual input voltage to the computer's motherboard, the current lack of, in particular, the computer's CPU components during large amounts of data operations
beats by dre, the required voltage, current, the greater the motherboard are not sufficient and stable voltage and current, so the system restart the phenomenon of voltage and current instability in the motherboard, interferes with the normal operation of the sound card, so that mixed the sound output current noise power input plug, metal plug wire column there is a slight bonding phenomenon, when the two plug wire column is not connected, the computer starts normally, when the two into line column connected and form a short circuit, open the external power supply, computer error that the start button is on a computer of a self-start phenomenon.
the experience and lessons
, the above failure is caused as a result of the friends in cleaning up the internal chassis of dust, not the power socket on the motherboard seated, so I hope all our friends in the plug of the motherboard power plug must be plugged tight.
Troubleshooting
because this machine has been able to use, it is estimated that there are no major problems of the computer's power, the use of tools to the metal plug wire column oxide thin cleaned to ensure good contact, and use a paper card to prevent the plug wire column again contact between the two plugs, plug socket, start the computer, the long-running, the computer is running stable, troubleshooting
