Three computer failures caused by cold weather
[Office Partner Information Channel] First, the motherboard does not work
The unit was newly equipped with a computer room at the beginning of the year, mainly equipped with i810T main board and Celeron 3 1GHz wwCPU. It has been working normally for several months. Since entering the winter, computers have been malfunctioning. When the computer is turned on every morning, there are always several screens that are not displayed. Open the chassis and observe that the power supply and CPU fan speed are normal, the power indicator is normal, and the hard disk indicator is not lit. Only leave the motherboard, memory, CPU, plug in the Debug troubleshooting card test, the LED display is 00, indicating that the motherboard is not running at all, the memory, power, CPU to the normal boot computer test is no problem. Even more strange is that if you do not turn off the power, after about 15 minutes, the faulty machine can be restored to normal. At this time, the power is turned off and then turned on, and it can be started smoothly. After entering the Windows 98 system, everything is normal. Later, this phenomenon became more and more intense, from the first few computers to more than a dozen. Take the motherboard to the computer city to replace it. Every motherboard at the counter can be started smoothly, so you have to take it back and continue to use it.
The unit computer room is located on the top floor, and the roof is not insulated. Although air conditioning is installed, it is usually only turned on at the time of the machine. In an accidental opportunity, as long as the air conditioner is turned on for 15 minutes and then the computer is turned on, all the faulty machines can be started smoothly. This is thought to be caused by the low temperature in the equipment room. In order to verify my own inference, the faulty machine was moved to a dormitory with central heating, and no malfunction occurred. In order to further find the faulty part of the motherboard, a hair dryer is found, and the heating block is used to heat the motherboard. When heated to the vicinity of the BIOS chip, the motherboard starts smoothly. Due to their limited level, the faulty component cannot be further determined. It is estimated that a certain resistor or capacitor is too low, the electrical parameter value has changed, and the power supply requirement for the motherboard startup cannot be achieved.
By looking up the information, the computer has strict requirements on the ambient temperature, and is divided into a, b, and c grades. The minimum c grade is 10 to 35 ° C, and the temperature in the morning computer room is only about 5 ° C. No wonder the computer can't run. . From then on, first turn on the air conditioner for 30 minutes and then turn on the computer power. The fault has not occurred.
Second, the computer can not find the hard disk
My friend upgraded his computer this summer. The motherboard is ABIT IS7 (the BIOS version is 1.4). Because of the limited funds, I didn't buy a new hard disk. I used the Seagate U5 20GB hard drive that was removed from the brand machine. normal. Since entering the winter, my friends have reported that when they first booted up, they sometimes couldn't find the hard disk. Once they restarted, they could find it. Recently, the situation is getting worse and worse. It is likely to be restarted several times to find it. Go to a friend's home, boot check, after the memory self-test, when detecting the IDE device, you can only find the Samsung 52× optical drive, but can not find the hard disk, initially determine the data line or hard disk problems. Disassemble the chassis, swap the 80-pin data cable of the optical drive and the hard disk, and turn it on again. The system can only detect the optical drive and cannot detect the hard disk. It seems that the hard drive data cable has no problem, and the Seagate 7200.7 80GB hard drive brought by itself is connected. Going to a friend's computer and successfully identifying the new hard drive, it seems that the friend's hard drive is broken. In the following days, the 20GB hard disk was used on my own computer, but it has been normal. There is no case that the motherboard can't find the hard disk, and the problem of connecting the hard disk to the friend's computer is still the same.
I started the experiment several times in my friend's house, and I put my ear close to the hard disk and watched the monitor. I felt that the hard disk only showed high-speed rotation after the motherboard detected the IDE device. It is speculated that the hard disk has not entered the normal working state, and the motherboard has been completed. Detection of IDE devices. Comparing the working environment of friends and the author's computer, the friend lives in a bungalow behind a high-rise building. In winter, it is only heated by electric heaters. The temperature of the room is very low, and the home is in a district with central heating. The room temperature is very high. From the structural analysis of the hard disk, the motor drives the hard disk to rotate at a high speed, and the disk data information is read by the swing of the magnetic head arm. The lubricant of the rotating part is likely to be in a semi-solid state in a low temperature environment, starting from the power-on of the hard disk to the complete operation. The time to enter the normal state is much slower than when the ambient temperature is higher. Now the motherboard supports the fast self-test function. The IDE has been tested when the hard disk has not entered the normal state. Of course, the hard disk cannot be found.
Boot into the BIOS and check the motherboard manual for the option of the quick self-test function. There is a “Delay IDE Initial†in the Advanced BIOS Features, which is to delay the waiting time of the IDE device. The range is 0-15, in seconds. By default it is 0. Set the value to 15 seconds, save and exit to restart the computer, the motherboard did not wait for 15 seconds before detecting the IDE device, or did not find the hard disk. Is there a bug in the motherboard BIOS? Put on my 80GB hard drive, install the system as fast as possible, drive "cat" to "drive home", find the latest 1.5 version of BIOS of ABIT IS7 in http:// page, download refresh, exchange 20GB hard drive, once again set the "Delay IDE Initial" value to 15 seconds, restart, check the memory system pause, 15 seconds after the start of testing IDE devices, successfully identified U5 20GB hard drive.
Third, the LCD display has no display
Due to the needs of the work, the unit was equipped with a Qi Li CMV-1515 LCD monitor, and it worked normally for several months. In the winter, the LCD monitor has a problem. At the time of power on, a raster flicker like clutter is displayed on the screen, and a click sound like a relay “click†can be heard. At this point, the hard disk light of the main unit is still flashing, and the sound of entering the desktop is sent from the speaker for a while, and it seems that the system is still running. Switch to a normal CRT monitor next to it, the image is normal, and then change the LCD monitor to the host next to it, the fault remains, it seems to be a problem with the LCD monitor.
How can we protect digital electronics?
Take a taxi to the computer city to change, the LCD display is normal at the dealer. After consultation, the liquid crystal display needs a suitable working environment. In the manual, the ambient temperature for normal operation is 5 ° C ~ 35 ° C, humidity 20% ~ 80%. The lowest temperature in the morning in the office is about 5 °C. Back to the unit experiment, turn on the air conditioner. When the ambient temperature reaches 20 °C, turn on the LCD monitor again, the screen display is normal. It seems that the LCD monitor has no display, which is the reason why the temperature is too low.
In general, we only pay attention to cooling the computer in the summer to prevent hardware failure caused by high temperature. I didn't expect the computer to be warm in winter. Otherwise, the low temperature will cause our computer to strike and create a "warm winter and cool summer" environment for the computer. The computer works comfortably for us.
Pet Feeder,Automatic Cat Feeder,Raised Dog Bowls,Automatic Dog Feeder
Green Source(Guangzhou) Co. Ltd. , https://www.stargalaxycn.com