[ Huaqiang Security Network News ] DVRs are widely used in the market, but there are still some problems. There is no perfect thing in the world. Let me talk about the problem of the "hardware" of the DVR! 
First, the mains voltage is unstable
Generally, the working frequency range of the switching power supply of the household hard disk recorder is 170v-240v. When the commercial power voltage is lower than 170v, the hard disk recorder will automatically restart or shut down. Because of the fluctuations in the mains voltage, we sometimes don't feel it, so we mistakenly think that the DVR is inexplicably and automatically restarted.
Solution: For areas with frequent power supply instability, we can purchase ups power supply or 130-260v wide switching power supply to ensure the stable operation of the hard disk recorder. Professional DVRs are best powered by 300-400v.
Second, the quality of the plug or power outlet is poor, poor contact
Most of the power strips on the market are of poor quality. The internal contacts are soldered by hand, and acid flux is often used. This will easily lead to the breakage of solder joints or the leakage between the live and neutral lines in later use. Because of the manual soldering, and because of the poor flexibility of the phosphor bronze sheet, it is easy to lose the elasticity after a long time, resulting in poor contact with the power plug of the host or the display, resulting in a large contact resistance, which will work for a long time. A large amount of heat causes a virtual connection, which means that the host reboots or the display black screen flashes.
There is also a wall socket that may be used in our home. Most wall sockets are not installed by professionals, so the wiring inside the socket is very standard. Especially these sockets are easy if we often use high-power electric heaters. This causes an internal thermal oxidative stimuli to form an intermittent power failure, causing the DVR to restart or the display to blink.
Solution:
1, do not save money and buy cheap power outlets, buy some brand-name power strips, because the inside of the machine is automatically installed crimping, no manual welding.
2. For the problem of whether it is a virtual connection inside the wall socket, we can try to change the host to a wall socket to see if there is the same automatic restart problem.
Third, the power of the DVR power supply is insufficient or poor performance
This situation is also more common, especially when we add new equipment to our host, such as replacing the high-end graphics card, adding a recorder, adding a hard disk, it is very easy to appear. When the host works at full speed, such as running monitoring software, high-speed burning or ready to read the disc, just start, when the dual hard disk copy data, it may stop the output because of the power shortage of the instantaneous power supply, but because the power is stopped After the output, the load is relieved and the power is turned on again. Because the recovery time after protection is very short, the performance given to us is that the host automatically restarts.
There is also a case where the performance of the host switching power supply is poor. Although the voltage is stable and within the normal allowable range, the harmonic content of the output power supply is too large, which may cause the host to crash or restart frequently. In this case, it is normal for us to test the voltage with a multimeter. It is best to replace an excellent power supply for replacement.
Solution: Now change the power of high quality and high power DVR.
Fourth, the mains switch power supply has a loose mains plug, poor contact, no plugging
In this case, most of them will appear on the diy machine. The power cord of the host power supply is not certified by 3c and is not compatible with the power socket. When we shake the table or touch the host, the host will automatically restart, usually accompanied by a slight electric slamming sound.
Solution: Replace the high quality 3c certified power cord.
Five, the motherboard's power atx20 socket has a virtual weld, poor contact
This kind of fault is not common, but it does exist. It is mainly when the host is working normally, and the atx20 pin plug is moved left and right to see if the host will restart automatically. At the same time, check the reed inside the 20-pin power plug for oxidation. This can easily lead to large contact resistance and poor contact, causing the host to freeze or restart. Sometimes it is necessary to check the cable at the end of the 20-pin plug.
Solution:
1. If it is the solder joint of the motherboard, it can be repaired directly with the soldering iron. Note: When soldering hard disk recorder boards such as motherboards, hard disks, graphics cards, etc., be sure to ground the soldering iron well or unplug the power cord during soldering.
2. If it is a power problem, it is best to replace a good power supply.
Six, cpu problem
The internal circuit of the cpu is damaged. When the L2 cache is damaged, the DVR can also be started. It will even enter the normal desktop for normal operation. However, when a special function is performed, it will restart or crash, such as drawing a table and playing vcd. , playing games, etc.
Solution: Try to mask the secondary cache (l2) or the primary cache (l1) in cmos to see if the host can run normally; no longer just replace it with a good cpu. If it works properly after being shielded, it can still be used. Although it is slower, it will save money.
Seven, memory problems
If a chip is not completely damaged on the memory stick, it is likely to pass the self-test (mostly the post is set), but at runtime, it will restart unexpectedly due to the function of the memory being hot. Most of the time, when the memory is damaged, the opportunity alarm is issued, but after the memory is damaged, there is no alarm, and the fault that is not powered is still there. It is best to use the exclusion method to quickly identify the fault location.
Eight, optical drive problem
If the internal drive is damaged, it will cause the host to start slowly or fail to pass the self-test, or it may restart suddenly during the work. For the latter case, if it happens after we replace the optical drive, it is likely that the power consumption of the optical drive is different. What everyone needs to understand is that although the optical drive's atpi interface is the same, the pin definitions of different manufacturers are different. If there is a problem with our hard disk cable, there may be no problem with the use of a certain brand of optical drive, but for other The brand CD-ROM drive can not work, this requires everyone's attention.
Nine, there is a problem with the quality of the reset key
If the reset switch is damaged and the internal reed is always in the shorted position, the main unit cannot be powered on. However, when the reset switch is weakened or the button on the chassis is pressed and it is not easy to bounce, it will appear during use, because the occasional touch of the chassis or under normal use and the host suddenly restarts. Therefore, when the reset switch cannot be pressed freely, we must check it carefully. It is best to replace the new reset button switch or apply lubrication to the external button of the chassis.
There is another case, because the reset switch leads in the chassis are excessively peeled off during soldering, and the multiple unpacking during use will cause the reset switch line to be too close and cause a collision, resulting in automatic restart of the host.
This situation is generally caused by external faults, such as the parallel port damage of the printer, short-circuit of one foot to the ground, short circuit of the usb device to the ground, non-standard work of the network card, etc. When we use these devices, it will be due to sudden power supply. A short circuit causes the DVR to restart.
Generally, the working frequency range of the switching power supply of the household hard disk recorder is 170v-240v. When the commercial power voltage is lower than 170v, the hard disk recorder will automatically restart or shut down. Because of the fluctuations in the mains voltage, we sometimes don't feel it, so we mistakenly think that the DVR is inexplicably and automatically restarted.
Solution: For areas with frequent power supply instability, we can purchase ups power supply or 130-260v wide switching power supply to ensure the stable operation of the hard disk recorder. Professional DVRs are best powered by 300-400v.
Second, the quality of the plug or power outlet is poor, poor contact
Most of the power strips on the market are of poor quality. The internal contacts are soldered by hand, and acid flux is often used. This will easily lead to the breakage of solder joints or the leakage between the live and neutral lines in later use. Because of the manual soldering, and because of the poor flexibility of the phosphor bronze sheet, it is easy to lose the elasticity after a long time, resulting in poor contact with the power plug of the host or the display, resulting in a large contact resistance, which will work for a long time. A large amount of heat causes a virtual connection, which means that the host reboots or the display black screen flashes.
There is also a wall socket that may be used in our home. Most wall sockets are not installed by professionals, so the wiring inside the socket is very standard. Especially these sockets are easy if we often use high-power electric heaters. This causes an internal thermal oxidative stimuli to form an intermittent power failure, causing the DVR to restart or the display to blink.
Solution:
1, do not save money and buy cheap power outlets, buy some brand-name power strips, because the inside of the machine is automatically installed crimping, no manual welding.
2. For the problem of whether it is a virtual connection inside the wall socket, we can try to change the host to a wall socket to see if there is the same automatic restart problem.
Third, the power of the DVR power supply is insufficient or poor performance
This situation is also more common, especially when we add new equipment to our host, such as replacing the high-end graphics card, adding a recorder, adding a hard disk, it is very easy to appear. When the host works at full speed, such as running monitoring software, high-speed burning or ready to read the disc, just start, when the dual hard disk copy data, it may stop the output because of the power shortage of the instantaneous power supply, but because the power is stopped After the output, the load is relieved and the power is turned on again. Because the recovery time after protection is very short, the performance given to us is that the host automatically restarts.
There is also a case where the performance of the host switching power supply is poor. Although the voltage is stable and within the normal allowable range, the harmonic content of the output power supply is too large, which may cause the host to crash or restart frequently. In this case, it is normal for us to test the voltage with a multimeter. It is best to replace an excellent power supply for replacement.
Solution: Now change the power of high quality and high power DVR.
Fourth, the mains switch power supply has a loose mains plug, poor contact, no plugging
In this case, most of them will appear on the diy machine. The power cord of the host power supply is not certified by 3c and is not compatible with the power socket. When we shake the table or touch the host, the host will automatically restart, usually accompanied by a slight electric slamming sound.
Solution: Replace the high quality 3c certified power cord.
Five, the motherboard's power atx20 socket has a virtual weld, poor contact
This kind of fault is not common, but it does exist. It is mainly when the host is working normally, and the atx20 pin plug is moved left and right to see if the host will restart automatically. At the same time, check the reed inside the 20-pin power plug for oxidation. This can easily lead to large contact resistance and poor contact, causing the host to freeze or restart. Sometimes it is necessary to check the cable at the end of the 20-pin plug.
Solution:
1. If it is the solder joint of the motherboard, it can be repaired directly with the soldering iron. Note: When soldering hard disk recorder boards such as motherboards, hard disks, graphics cards, etc., be sure to ground the soldering iron well or unplug the power cord during soldering.
2. If it is a power problem, it is best to replace a good power supply.
Six, cpu problem
The internal circuit of the cpu is damaged. When the L2 cache is damaged, the DVR can also be started. It will even enter the normal desktop for normal operation. However, when a special function is performed, it will restart or crash, such as drawing a table and playing vcd. , playing games, etc.
Solution: Try to mask the secondary cache (l2) or the primary cache (l1) in cmos to see if the host can run normally; no longer just replace it with a good cpu. If it works properly after being shielded, it can still be used. Although it is slower, it will save money.
Seven, memory problems
If a chip is not completely damaged on the memory stick, it is likely to pass the self-test (mostly the post is set), but at runtime, it will restart unexpectedly due to the function of the memory being hot. Most of the time, when the memory is damaged, the opportunity alarm is issued, but after the memory is damaged, there is no alarm, and the fault that is not powered is still there. It is best to use the exclusion method to quickly identify the fault location.
Eight, optical drive problem
If the internal drive is damaged, it will cause the host to start slowly or fail to pass the self-test, or it may restart suddenly during the work. For the latter case, if it happens after we replace the optical drive, it is likely that the power consumption of the optical drive is different. What everyone needs to understand is that although the optical drive's atpi interface is the same, the pin definitions of different manufacturers are different. If there is a problem with our hard disk cable, there may be no problem with the use of a certain brand of optical drive, but for other The brand CD-ROM drive can not work, this requires everyone's attention.
Nine, there is a problem with the quality of the reset key
If the reset switch is damaged and the internal reed is always in the shorted position, the main unit cannot be powered on. However, when the reset switch is weakened or the button on the chassis is pressed and it is not easy to bounce, it will appear during use, because the occasional touch of the chassis or under normal use and the host suddenly restarts. Therefore, when the reset switch cannot be pressed freely, we must check it carefully. It is best to replace the new reset button switch or apply lubrication to the external button of the chassis.
There is another case, because the reset switch leads in the chassis are excessively peeled off during soldering, and the multiple unpacking during use will cause the reset switch line to be too close and cause a collision, resulting in automatic restart of the host.
This situation is generally caused by external faults, such as the parallel port damage of the printer, short-circuit of one foot to the ground, short circuit of the usb device to the ground, non-standard work of the network card, etc. When we use these devices, it will be due to sudden power supply. A short circuit causes the DVR to restart.
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