Seven cases solution CPU common trouble

Computer use for a long time, it is inevitable that such a failure. In many computer failures, board card class appears the most likely. Although the CPU is an important part of the computer, but the probability of failure is relatively small, common CPU failures are roughly the following: thermal failure, restart failure, black screen fault and overclocking failure. Because the CPU itself has a very low probability of failure, most of the failures are due to user carelessness.

Case one: CPU damage causes the computer to restart continuously

Fault phenomenon: A friend of a assembly machine, the recent emergence of continuous restart, its performance is sometimes just appear to start the screen is restarted, or into the system soon after the reboot.

Analysis and resolution: Because this machine has been connected through ADSL broadband network, and the recent Internet virus rampant, so the first killing virus, the problem remains. Friends have downloaded and tried a variety of software, so reformat the hard drive installation system. During the installation of the blue screen and the phenomenon of panic, skip the error prompted, finally installed the system.

However, the system continues to restart the problem is still unresolved. Friend Computer bought for 3 years, rarely to the chassis cleaning, is not the internal dust caused by too much hardware contact bad? Open the chassis and clean and wipe important parts such as power supplies, CPU fans, and memory. After the completion of the reboot, the computer will continue to restart. By this time, I realized that there might be a problem with some computer hardware. First of all the question of power supply, directly replaced a brand 300W power supply, the fault remains. Then, I only came up with the killer-"minimum system method." Retain the system to start the necessary hardware troubleshooting, the results of the computer is still constantly restart, but this will be the scope of the suspected cause of the fault. Then sacrifice "Change", until the replacement of the CPU and installed good, the failure to disappear, the system restart the culprit is cpu! original, friend computer CPU has replaced the fan and radiator. Due to improper installation caused the radiator and CPU contact bad, the impact of the CPU heat dissipation, after a long period of use, greatly shorten the life of the CPU.

Summary: For general computer failures, if the system is not completely paralyzed, we rarely suspect the possibility of CPU damage. But nothing is absolute, in the event of failure, we have to carefully and carefully in order to carefully troubleshoot, not to let off a hint of suspicion, you can find the real fault.

Case two: "Low temperature" work can also burn the CPU

Failure phenomenon: A friend of the author has done such a test, the desktop Celeron D processor running at the standard frequency (no overclocking), through the hair dryer heating to 55 degrees Celsius (using the motherboard temperature monitoring function), as long as the running CPU high rate of the program, a panic; and the Celeron D overclocking, the system temperature is about 50 degrees Celsius, running quake more than 10 minutes before the crash. It is estimated that at this time the temperature has exceeded 55 degrees Celsius, and its core temperature by the measured, found to have reached 86.4 degrees Celsius. It was later found that the CPU was running at such low temperatures that it almost burned down. But he found no such "duplicity" problem with laptops.

Failure Analysis: Originally this is the motherboard detected CPU temperature to confuse us. In fact, the desktop board now reports that the CPU temperature is not at all its core temperature, because the desktop board common temperature probe does not and CPU heatsink or CPU contact, measuring only the temperature near the CPU. This has caused many CPUs to burn under seemingly low temperatures. According to Intel's data, Pentium's temperature limit at 85 degrees Celsius, if everyone is not vigilant, believed plaintiff motherboard report, that its CPU is still running at low temperatures, that is wrong.

Why doesn't this difference happen to laptops? The original notebook in the CPU temperature measurement used is thermistor, temperature point at the bottom of the CPU, if the direct reading, in fact, the temperature is not so high, and its display of the monitoring temperature has been corrected, than the temperature measurement, so closer to the core temperature of the CPU. So most of the notebook test CPU temperature is the core temperature, does not occur under low temperature burned the CPU situation.

Case THREE: The CPU pin contact is bad, cause the machine can not start

Failure phenomenon: A user of a Athlon CPU computer, weekday use has been normal, one day suddenly unable to boot, the screen shows no signal output, began to identify the video card failure. After checking with the replacement method, found that the video card is not a problem, and then speculated that the monitor failure, after inspection, the monitor is all normal. Wonder, unplug the CPU inserted in the motherboard, careful observation and no burn traces, but is unable to light the machine. Later found that the CPU's pins are black, hair green, there are signs of oxidation and rust (the CPU's pins for copper materials, the outer layer of gold), and then the CPU with a toothbrush to do the work of the cleaning machine, the computer can be added to the electrician.

Failure Analysis: The CPU after the removal of rust solved the problem, but how the rust came. Finally put the doubt on the piece of refrigeration, there have been articles about the condensation phenomenon of refrigeration film, may be due to the chip's surface temperature drop too low, too low to end the dew point, resulting in long-term CPU work in the humid environment. And the exposed copper pins in this environment react with oxygen in the air to produce a patina. The accumulation of rust too much caused bad contact, which caused this strange fault. In addition, there are some inferior motherboards, due to the poor quality of the CPU slot, will also cause poor contact, users need to fix their own CPU and socket contact before the problem can be solved.

Case FOUR: Suspend mode causes CPU to burn

Symptom: The general system hangs does not cause the CPU to burn, the system will automatically reduce the CPU working frequency and the fan speed to save energy consumption. And here the suspend mode caused the CPU to burn, are overclocking after the CPU. Perhaps you would think this is a little weird, how can the overclocking CPU be burned?

This is due to the fan stop running. Originally, the monitor chip on the motherboard can monitor the fan speed outside, some can also in the system into the suspend (suspend) power mode, automatically reduce fan speed or even completely stop operation, this is well-intentioned, can save electricity, also can prolong the life and use time of the fan. In the past the CPU is idle, the heat is not high, so the fan does not turn, only rely on the heatsink can also cope with heat dissipation. But now the CPU frequency is too high, even if you enter the Suspend mode, when the fan does not turn, the CPU will also be hot hair hot. Therefore, some people will encounter, when from suspend to normal mode, Windows will panic and a blue screen, this is the CPU overheating generated errors. In serious case, the CPU will be hung up because of overheating.

Failure Analysis: This situation does not occur on every motherboard, and must meet three conditions when it occurs. First, the CPU fan must be a 3pin fan, which will be controlled by the motherboard. Second, the motherboard's monitoring function must have fan off when Suspend (fan power is turned off in suspend mode), and this feature is preset to ON. Some motherboard presets on, and even some of the power management settings have fan off when suspend this option, you can pay attention to see. Third, enter the suspend mode. So, check your computer now.

Case five: Common CPU frequency failures

Fault phenomenon: There is a computer CPU for ATHLONXP 1600+, boot after the BIOS display for 1050MHz, but the normal athlonxp 1600+ should be 10.5 times times the frequency X133mhz FSB the =1400mhz frequency. In the BIOS found that the largest can be set to 129MHz, FSB found that the board's dip switch to the 100MHz FSB, so that it is converted to 133MHz FSB, after the boot black screen, CPU fan running normally. Repeated several times are so, and then the motherboard on the DIP switch all to auto, in the default state, the system self-test is still 1050MHz. Suspected memory and graphics, such as different steps, reduced memory from 2 to 2.5, still unable to normal self-test, and the AGP video card from 4X to 2X mode, boot back to normal.

Failure Analysis: Later confirmed that this user's version of the video card is older, the default AGP working frequency is 66MHz (in 100MHz, the operating frequency of PCI is 100÷3=33.3MHZ,AGP is Pcix2=66.6mhz, The frequency of AGP at 133MHz FSB is 133÷3x2=88.7mhz, because the frequency of the AGP is increased to 88.7MHz because of the 133MHz FSB used by ATHLONXP. Therefore, the display black screen is clearly for the video card, the video card to reduce the operating frequency, the system back to normal.

I also often see the network due to abnormal CPU frequency caused by the fault, some early Pentiumⅲ or Athlon motherboards are the default 100MHz FSB, and now the new core of the CPU are 133MHz FSB. In this case, the motherboard automatically detects, the CPU is used to reduce frequency, often not be found by people. This type of situation can only be achieved by adjusting the FSB and the video card or memory asynchronous work.

Case SIX: Computer performance decline Puzzle

Failure phenomenon: A Pentium 4 computer in the initial performance of an unusually stable, but later appeared to infect the virus, performance significantly decreased, occasionally accompanied by the crash phenomenon. The first use of anti-virus software killing no discovery. The problem follows the disk Defragmenter of Windows, which then suspects excessive disk fragmentation. Also considered to be a problem with Windows, the format of the reload system, still has no effect. Open the chassis to find a problem with the fan of the CPU heatsink and do not turn on after PowerUp. Replace the new heatsink and troubleshoot.

Failure Analysis: The original Pentium 4 processor core equipped with a thermal monitoring system, it will continue to detect temperature. As long as the core temperature reaches a certain level, the system will reduce the operating frequency of the processor until the core temperature is restored below the safety limit. This is the real reason for system performance degradation. At the same time, this also shows the importance of the radiator, recommend a preference for some brand radiators, but they also have grades, in the purchase should pay attention to its ability to support the maximum frequency of the CPU, and then according to their CPU each other.

Case Seven: constantly restarting the host

Failure phenomenon: A mistake to the CPU heatsink of the clip out. The clip was then installed back into the heatsink as it was. Reinstall the fan power Evaluation, the results of the boot, the computer will automatically restart. Check the other parts are fine, according to the conventional experience should be the heat part of the problem. It is possible that the motherboard detects CPU overheating and is automatically protected. But repeatedly check the thermal grease and heatsink are no problem, reinstall back or repeated reboot. After replacing the cooling fan, all OK. Is there a problem with the heat sink, after repeated comparisons finally found that the original buckle is the direction of the reverse. As a result, there is a gap between the heatsink and the CPU core, the CPU overheating, the motherboard detecting CPU overheating, and restart protection. Improper installation of the original CPU cooling fan will also cause Windows to automatically reboot or not boot.

Fault analysis: CPU with the process and integration of the continuous improvement of the core heat has been a more serious problem, so the current CPU on the cooling fan requirements are increasingly high. The problem caused by improper installation of the cooling fan is quite common and frequent. If you are using a CPU such as Pentium 4 or Athlon, select a quality CPU fan and be sure to pay attention to its proper installation method. Otherwise, the light is machine restart, heavy-fried CPU burned.

In fact, these failures are not terrible, most of the users are careless caused. Common failures are mainly concentrated in the heat and frequency of two, as long as can be careful and careful can avoid similar problems appear. Of course, we also hope that we can learn to solve the problem of the CPU and methods, so in the face of CPU failure can be calmly dealt with.