(1) motherboard article
The cause of computer failure is confusing and elusive. Moreover, because the components of the Windows operating system are relatively complex, it is almost impossible for ordinary users to accurately find out the cause of the failure once the computer fails. So does it mean that if there is a computer failure, we are completely helpless? Actually, it's not like this. Although there are many reasons for computer failures, as long as we carefully observe and summarize, we can still master some laws and treatment methods of computer failures. In this booklet, we will show you some of the most common and typical computer fault diagnosis and maintenance methods. Through it, you will find that the solution of computer fault is at your side, simple but effective!
This computer is made up of various accessories. Below, we will analyze its common faults according to the components that make up the computer.
First, the motherboard
Motherboard is the key component of the whole computer and plays a vital role in the computer. If the motherboard fails, it will affect the work of the whole PC system. Next, let's take a look at the most common failures of the motherboard in use.
Common fault one: no display when starting the machine
The computer does not display when it is turned on. The first thing we need to check is the BIOS. Important hardware data is stored in the BIOS of the motherboard. At the same time, BIOS is also a fragile part of the motherboard, which is easy to be damaged. Once damaged, the system will not work. This failure is generally caused by the CIH virus destroying the BIOS of the motherboard (of course, it is not excluded that the failure of the motherboard itself causes the system to fail to run. )。 Generally, after the BIOS is destroyed by virus, all the data in the hard disk will be lost, so we can judge whether the BIOS is destroyed by detecting whether the hard disk data is intact. If the data on the hard disk is in good condition, there are three other reasons why it will not be displayed when it is turned on:
1. Because there is something wrong with the motherboard expansion slot or expansion card, the motherboard does not respond after inserting expansion cards such as sound cards and does not display.
2. The CPU frequency of the jumper-free motherboard set in CMOS is wrong, which may also lead to the failure of not displaying, which can be solved by clearing CMOS. The jumper for clearing CMOS is generally near the lithium battery on the motherboard, and the default position is generally 1 2 short circuit. As long as it is changed to 2, 3 short circuit for a few seconds, the problem can be solved. For the old motherboard, if the user can't find the jumper, just take out the battery, wait until the boot display enters the CMOS setting, then shut down and put the battery on it to achieve the purpose of CMOS discharge.
3. The motherboard can't recognize the memory, and the memory is damaged or mismatched, which will also lead to the failure of not displaying when booting. Some old motherboards are very picky about memory. Once the memory that the motherboard can't recognize is plugged in, the motherboard can't start, and even some motherboards don't give you any fault tips (chirp). Of course, sometimes in order to expand memory and improve system performance, plugging in different brands and types of memory will also lead to such failures, so pay more attention to maintenance.
For the failure of motherboard BIOS damage, we can plug in ISA graphics card to see if it is displayed (if prompted, you can follow the prompt steps). ), if there is no boot screen, you can make a floppy disk that automatically updates the BIOS and refresh the BIOS, but after the BIOS of some motherboards is destroyed, the floppy drive doesn't work at all. At this time, you can try to solve it by hot plug (I tried, as long as the BIOS is the same, it can burn successfully on the same level motherboard. )。 However, in addition to using the same BIOS, hot plug may also damage some components of the motherboard, so a more reliable method is to write the BIOS update file into the BIOS with a code writer (it is safer to find a computer manufacturer with this service).
Common fault 2: CMOS settings cannot be saved.
This kind of fault is generally caused by insufficient voltage of the motherboard battery, which can be replaced, but some motherboard batteries can not solve the problem after replacement. At this time, there are two possibilities:
1. The motherboard circuit problem needs professional maintenance;
2. The problem of the motherboard CMOS jumper, sometimes because the CMOS jumper on the motherboard is mistakenly set to the reset option, or set to the external battery, resulting in CMOS data can not be saved.
Common fault 3: Windows crashes after installing motherboard driver or slow reading speed of CD-ROM drive.
This phenomenon sometimes appears on some motherboards with miscellaneous brands. After the motherboard driver is installed, the restarted computer cannot enter the Windows 98 desktop in normal mode, and the driver cannot be uninstalled under Windows 98. If this happens, it is recommended to find the latest driver and reinstall it. General problems can be solved. If it really doesn't work, you can only reinstall the system.
Common failure 4: The mouse is not available when installing or starting Windows.
The software cause of this fault is generally caused by CMOS setting error. There is a modem use IRQ item in the power management bar of CMOS settings, and the options are 3, 4, 5 ... and NA. Generally, its default option is 3, so you can set it as an interrupt other than 3.
Common fault five: the computer often crashes, and CMOS settings will also crash.
In CMOS, there is a crash phenomenon, usually there is something wrong with the motherboard or CPU. If the failure cannot be solved by pressing the button, the motherboard or CPU must be replaced.
This kind of fault is generally caused by the problem of motherboard cache or poor heat dissipation in motherboard design. The author once found that the motherboard on 8 15EP failed due to poor heat dissipation. Touch the motherboard parts around the CPU after the crash and find that its temperature is very hot. After replacing the high-power fan, the crash fault was solved. For the fault with cache problem, you can enter CMOS settings, and the problem can be solved smoothly after disabling cache. Of course, the speed will definitely be affected after caching is prohibited.
Common fault 6: COM port or parallel port and IDE port of motherboard are out of order.
This kind of fault is generally caused by users plugging and unplugging related hardware. At this time, the user can replace it with a multi-function card, but before replacing it, the COM port and parallel port on the motherboard must be disabled (some motherboards even disable the IDE port to work normally).
(2) Memory articles
Second, memory.
Memory is one of the most important accessories in a computer, and its function is beyond doubt. So what is the most common problem with memory?
Common fault one: no display when starting the machine
This kind of fault is generally caused by poor contact between the memory stick and the motherboard memory stick. Wipe the golden finger back and forth with an eraser to solve the problem (don't use alcohol to clean it. ), and memory damage or motherboard memory slot problems can also lead to such failures.
When the computer is turned on due to the memory card, there is no fault, and the host speaker will generally buzz for a long time (for the award-winning Bios).
Common fault 2: Windows registry is often damaged for no reason, prompting users to recover.
This kind of fault is generally caused by poor quality of memory chips, which is difficult to repair. There is only one way to replace it.
Common fault 3: Windows often automatically enters safe mode.
This kind of failure is generally caused by the incompatibility between the motherboard and the memory stick or the poor quality of the memory stick. It is common to use high-frequency memory on some motherboards that do not support this frequency memory. You can try to slow down the memory reading speed in CMOS settings to see if it can solve the problem. If not, the memory stick will have to be replaced.
Common fault 4: random collapse
This failure is generally due to the use of several different chips of memory chips. Because the speed of each memory chip is different, there is a time difference, which leads to the crash. This can be solved by reducing the memory speed in CMOS settings, otherwise only the same type of memory can be used. Another possibility is that the memory module is incompatible with the motherboard, which is generally rare. In addition, it is also possible that poor contact between the memory stick and the motherboard causes the computer to crash randomly.
Common fault 5: System resources decrease after memory increases.
This phenomenon is generally caused by incompatibility between motherboard and memory. It is common to use high-frequency memory chips on some motherboards that do not support this frequency. When this kind of fault occurs, you can try to set the memory speed of COMS to be lower.
Common fault six: when running some software, there are often hints of insufficient memory.
This phenomenon is usually caused by insufficient remaining space on the system disk. You can delete some useless files and leave more space. Generally, it is more appropriate to keep it around 300 mm.
Common fault 7: When installing Windows from hard disk startup to detecting disk space, the system prompts that there is not enough memory.
This failure is generally due to the fact that the user added a emm386.exe file to the config.sys file, and shielding can solve the problem.
(3) Hard disk items
Third, the hard disk.
The hard disk is a warehouse for storing our data. If the failure of hard disk is not handled properly, it will often lead to system failure and data loss. So, how should we deal with the common failures of hard disks?
Common fault 1: The system does not recognize the hard disk.
The system can't boot from the hard disk, nor can it enter the C disk from the A disk, and the existence of the hard disk can't be found by using the automatic monitoring function in CMOS. This kind of fault mostly appears on the connecting cable or IDE port, and the hard disk itself is unlikely to fail. You can quickly find the fault by plugging in the hard disk cable again or replacing the IDE port and cable. If the newly connected hard disk is not accepted, a common reason is the master-slave jumper on the hard disk. If two hard disk devices are connected to an IDE hard disk line, it is necessary to distinguish the master-slave relationship.
Common fault 2: the hard disk can't be read or written, and it can't be recognized.
This kind of fault is generally caused by CMOS setup fault. Whether the type of hard disk in CMOS is correct directly affects the normal use of hard disk. Now all machines support the IDE Auto-detection function, which can automatically detect the hard disk type. When the hard disk type is wrong, sometimes the system can't be started at all, and sometimes it can be started, but there will be read-write errors. For example, if the type of hard disk in CMOS is smaller than the actual hard disk capacity, the sectors behind the hard disk will not be able to read and write, and if it is in a multi-partition state, a single partition will be lost. There is another important reason for failure. Because the current IDE supports logical parameter types, the hard disk can be "normal, LBA, large" and so on. If you install data in general mode, but change it to other modes in CMOS, there will be a hard disk reading and writing error fault, because its mapping relationship has changed, and the original correct hard disk location will not be readable.
Common fault 3: the system can't start.
This failure is usually caused by the following four reasons:
1. The main boot program is damaged.
2. The partition table is damaged
3. Partition valid bit error
4. The 4.DOS startup file is damaged
Among them, the damage of DOS boot file is the simplest. After booting with the startup disk, it is enough to transfer a boot file to the system. The main boot program damage and partition valid bit damage can also be solved by FDISK /MBR forced overwrite. It is troublesome to damage the partition table, because the partition cannot be identified, and the system will treat the hard disk as an unpartitioned bare disk, thus causing some software to fail to work. But there is a simple way-using Windows 2000. Find a system with Windows 2000, hang up the damaged hard disk, and after booting, in order to ensure the stability of the system hardware, Windows 2000 will scan the newly connected hard disk. CHKDSK, the hard disk scanner of Windows 2000, has a good ability to repair hard disks damaged for various reasons, and basically repaired the hard disks after scanning.
There is another form of partition table corruption, which I call "partition mapping" here. The specific performance is that a partition is the same as an active partition. It also includes file structure, content and partition capacity. If the content of the partition changes in any area, it will be reflected in another place, just like the shadow of the map. I once encountered a 6.4G hard disk that became 8.4G (mapped to the C area of 2G). This kind of question is particularly embarrassing. This problem does not affect the use. Just don't fix it. But when it comes to repair, Norton's DISKDOCTOR and PQMAGIC both turn a blind eye, turning a blind eye to the inconsistency between the total capacity of the partition and the actual size of the hard disk, so it's no problem to perfunctory you. To solve this problem, only GHOST can overwrite the recovery partition table with Norton's rescue disk.
Common Fault 4: Bad tracks on the hard disk
This is a shocking and frightening word. Recently, IBM's reputation has also declined. When you scan the hard disk with SCANDISK, a disk scanning program that comes with Windows system, the system will prompt that the hard disk may have a bad track, and then a horrible blue and yellow square will flash out slowly, and then a "B" will be marked on a square. ...
In fact, most of these bad roads are logical and can be repaired. There is no need to send it for repair (it is said that the reason why manufacturers develop self-checking tools is because they can't stand the "cruel" fact that half of the repaired hard disks have no problem at all).
So, when such problems arise, how should we deal with them?
Once the hard disk is scanned with SCANDISK, if the program prompts that there is a bad track, first of all, we have to re-use the self-checking program of each brand of hard disk for a complete scan. Be careful, don't choose quick scan, because it can only find out about 90% of the problems. In order to reassure yourself, it is worthwhile to spend more time here.
If the inspection result is "successful repair", it can be determined that the logic is not good, and you can pat your chest to catch your breath; If not, there is no possibility of repair. If your hard disk is still within the warranty period, please replace it quickly.
Because the logical bad track is only marked with the cluster number, it will not be assigned to the file in the future. If it is a logical bad track, just reformat the hard disk. However, in order to prevent possible format discarding (because the cluster number has been marked as a bad cluster, the formatter may accept this "reality" without checking, so the cluster is discarded), it is better to repartition, and it is quite fast to use software such as IBM DM, or GHOST overwriting is also possible, but both schemes will lose some data to a certain extent.
Common fault five: the hard disk capacity obviously does not match the nominal value.
Generally speaking, the formatted capacity of a hard disk will be less than the nominal value, but the difference will never exceed 20%. If there is a big gap between the two, you should enter the BIOS settings when booting. Make reasonable settings according to your own hard disk. If not, it may be that your motherboard does not support large-capacity hard disks. At this time, you can try to download the latest motherboard BIOS and refresh it. This kind of fault mostly occurs when the large-capacity hard disk is matched with the older motherboard. In addition, the sudden power failure may also lead to the disorder of BIOS settings.
Common fault 6: No matter what equipment is used, the system can't boot normally.
This kind of failure is generally because the hard disk is locked by a virus "logical lock", which is a very common prank. After the logical lock, no matter what equipment you use, you can't boot the system normally, even the floppy disk, CD-ROM drive and dual disk have no influence.
Locking principle of "logical lock": When the computer starts the DOS system, it will search the order of all logical disks. When booting DOS, we should first find the partition table information of the main boot sector, and then find the logical disk of each extended partition. "Logical lock" modifies the normal record of the main boot partition and points the first logical disk of the extended partition to itself, so that DOS always finds itself when it finds the first logical disk at startup, thus forming an infinite loop.
An easier way to open the logical lock is to "hot plug" the hard disk power supply. That is, when the system starts, the locked hard disk is not powered on first, and then the power cord is "hot-plugged" to the hard disk after starting, so that the system can control the hard disk normally. This is a very dangerous method. In order to reduce the danger, you'd better follow the following simple and safe methods after encountering a "logical lock".
1. First prepare a startup disk, and then use the binary editing tool (UltraEdit is recommended) to modify IO on other common machines. SYS file on floppy disk (remember to change the attribute of the file to normal before modification). Specifically, search for the first "55AA" string in this file and modify it to any other value after finding it. With this modified system floppy disk, you can successfully boot from the locked hard disk. But at this time, because the normal partition table of the hard disk has been destroyed, you can't use "Fdisk" to delete and modify partitions. At this point, you can use Diskman and other software to restore or rebuild the partition.
2. Because DM is a hard disk tool that does not rely on the motherboard BIOS to identify hard disks, even if the hard disk is set to "None" in the motherboard BIOS, DM can identify hard disks and perform operations such as partitioning and formatting, so we can also use DM software to unlock hard disks.
Copy the DM to the system disk first, connect the locked hard disk, then turn it on, press the "Del" key to enter the BIOS settings, set all IDE interfaces to "None" and then exit, and then start the system with a floppy disk, so that the system can start with a lock, because at this time, the system basically has no hard disk. Run DM after booting, and you will find that DM can recognize the hard disk. Just select the hard disk for partition formatting. This method is simple and convenient, but it has a fatal disadvantage that the data on the hard disk cannot be saved.
Common fault seven: the hard disk can't start when it is turned on, and the system doesn't recognize the hard disk.
This fault is often the most terrible. The main reason for this failure is that the data of the main boot sector of the hard disk is destroyed, indicating that the main boot mark or partition mark of the hard disk is lost. The chief culprit of this failure is often a virus, which overwrites the wrong data in the main boot sector. Some common antivirus software on the market provides the function of repairing hard disk, so try it. However, if you don't have such a tool disk at hand, you can try to write all 0 data into the main boot sector and then re-partition and format it. The method is as follows: Start the computer with a clean DOS startup disk, and enter a: \ > Then enter the following command (comments in brackets):
Answer: \> Debugging (enter debugging program)
-f 1003ff0 (clear the contents of the data area to 0)
-A 400 (add the following command)
MOV AX，030 1
MOV BX，0 100
MOV CX，000 1
MOV DX，0080
INT 13
INT 03
-g = 400 (execute command to operate disk)
-q (exit debugging program)
Generally speaking, your hard disk can be recovered by this method, but the data in it will be difficult to protect because it needs to be repartitioned and formatted. The above are some common faults and solutions of hard disk in daily use, hoping to inspire everyone. If the failure of the hard disk is quite serious and cannot be handled by some of the above methods, it is probably a mechanical failure. Because the hard disk structure is quite complicated, users are not advised to disassemble it by themselves, and should seek help from professionals for maintenance.
(4) Sound card
Fourth, the sound card
Common fault one: the sound card is silent
Common reasons for this failure are:
The default output of the 1. driver is Mute. Click the small sound icon (small beep) in the lower right corner of the screen, and the volume adjustment slider will appear with the option of "Mute" below. Click the check box in front, clear the check mark in the box, and you can pronounce it normally.
2. The sound card conflicts with other cards. The solution is to adjust the system resources used by PnP cards so that these cards will not interfere with each other. Sometimes when you open Device Management, although there is no yellow exclamation mark (conflict sign), the sound card just doesn't sound. In fact, there is a conflict, but the system did not find it.
3. After installing Direct X, the sound card cannot make sound. This means that this sound card is not compatible with Direct X, and the driver needs to be updated.
4. A channel is silent. Check whether the audio cable from the sound card to the speaker is damaged.
Common fault 2: the sound card is too noisy.
Common reasons for this failure are:
1. Card is not inserted correctly. Because the manufacturing accuracy of the chassis is not high enough, the external baffle of the sound card is not well manufactured or installed, and the sound card cannot be closely combined with the expansion slot of the motherboard. Visually, the "golden finger" on the sound card is misplaced with the expansion slot reed. This phenomenon is very common in both ISA cards and PCI cards. Generally, it can be corrected with pliers.
2. The input of the active speaker is connected to the speaker output of the sound card. For the active speaker, it should be connected to the Line out end of the sound card, and its output signal has not passed through the power amplifier on the sound card, so the noise is much less. Some sound cards have only one output. Whether it is line output or speaker depends on the jumper on the card. The default mode of the manufacturer is often the speaker, so unplug the sound card and adjust the jumper.
3.Windows comes with a bad driver. When installing the sound card driver, you should choose the driver provided by the manufacturer instead of the default driver of Windows. If you install by adding new hardware, you should choose "Have Disk" instead of the list box. If you have installed the drivers that came with Windows, you can select Control Panel → System → Device Management → Sound, Video and Game Controller, click each device, and then select Properties → Drivers → Change Drivers → Install from Disk. At this time, insert the disk or CD attached to the sound card and load the driver provided by the manufacturer.
Common fault 3: the sound card can't be "plug and play"
1. Try using a new driver or a replacement program. I used to have a sound card, but I couldn't install the driver with the original drive disk under Windows 98, so I had to use the creative SB 16 driver instead, and everything was fine. Later, I upgraded to Windows Me, but it didn't work properly. Then I switched to Windows 2000 (full version) and the sound card driver came with it worked normally.
2. The biggest headache is that Windows 9X detects the plug-and-play device but helps you install the driver without permission. This driver is not available. In the future, you will repeat this problem every time you delete and reinstall, and it cannot be solved by adding new hardware. Here, the author reveals a trick: enter the Win9xinfother directory and delete all the *. About the inf file of the sound card, restart and install it manually. This trick 100% is effective, saving countless sound cards ... Of course, modifying the registry can also achieve the same goal.
3. Installing a PnP sound card is not supported (also applicable to PnP sound cards that cannot be installed by the above PnP method): Enter the control panel/Add new hardware/Next, and prompt "Do you need Windows to search for new hardware?" , select "No", and then select "Sound, Video and Game Controller" from the list to install with the drive disk or directly select the sound card type.
Common fault 4: playing CD silently
1. Completely silent. Windows 98 CD player plays CD silently, but the CD player works normally, indicating that the audio cable of the CD drive is not connected properly. Just use a 4-core audio cable to connect the analog audio output of the optical drive with the CD-In on the sound card. This cable comes with the purchase of CD-ROM.
2. There is only one channel. The output port of CD-ROM drive generally has two lines of signals, and the middle two lines are ground wires. Because the colors of the four audio signal lines are generally different, one-to-one interfaces can be found from the colors of the lines. If there is only one interface on the sound card or each interface does not match the audio cable, we have to change the wiring order of the audio cable, usually only two can be interchanged.
Common breakdowns The PCI sound card has a sonic boom.
The background noise is amplified when the general PCI graphics card uses the bus master control technology, which leads to the hard disk hanging on the PCI bus reading and writing and the mouse moving. Solution: Turn off the bus master control function of PCI graphics card, switch to AGP graphics card, and switch PCI sound card to slot.
Common fault 6: unable to record normally.
First, check whether the microphone is inserted into other jacks by mistake. Second, double-click the speaker and select "Properties → Recording" on the menu to see if the settings are correct. Next, adjust "Mixer Equipment" and "Line Input Equipment" in "Control Panel → Multimedia → Equipment" and set them to "Use" status. It would be too bad if the "Record" option in "Multimedia → Audio" is grayed out. Of course, there is no room for redemption. You can try to add "ISA Plug-and-Play Bus" to "Add New Hardware → System Equipment", simply install the sound card with the card tool software and restart it.
Common fault 7: Wav music and Midi music cannot be played.
Few Wav music can't be played. It is often because there is more than one audio device under Multimedia → Devices, so just disable one. If the MIDI file cannot be played, there are three possibilities:
1. The early ISA sound card may be caused by the incompatibility between 16 bit mode and 32 bit mode, which can be solved by installing a software wave table.
2. Most popular PCI sound cards now use wave table synthesis technology. If the MIDI part can't be played, it's probably because you haven't loaded the appropriate wave table sound library.
3. MIDI channel in 3.Windows volume control is set to mute mode.
Common faults PCI sound card can not be used normally under WIN98.
Some users reported that everything was normal when the sound card driver was installed, and there was no equipment conflict, but there was no sound or other fault under WIN98. This phenomenon usually appears on PCI sound cards. Please check which PCI slot you inserted the PCI sound card into during installation. Some friends like to plug the sound card into the PCI slot far away from AGP slot and close to ISA slot to dissipate heat. This is a frequent problem, because Windows98 has a Bug: sometimes it can only correctly identify sound cards inserted in PCI- 1 and PCI-2 slots. On ATX motherboards, the two PCI cards next to AGP are PCI- 1 and PCI-2 (on some ATX motherboards, on the contrary, PCI- 1 is next to ISA), so if the PCI sound card is not installed in the correct slot, there will be problems.
(5) Graphics card
Verb (abbreviation of verb) graphic card
Common fault one: no display when starting the machine
This kind of failure is generally caused by poor contact between the graphics card and the motherboard or problems with the motherboard slot. For some motherboards with integrated graphics cards, if the main memory is used for video memory, it is necessary to pay attention to the location of the memory bar. Usually, the memory module should be inserted into the first memory module slot. Because of the graphics card, the computer did not show the fault when it was turned on. Generally, there will be a long beep and a short beep after the computer is turned on (for the BIOS graphics card).
Common fault 2: display the flower screen, and you can't see the handwriting clearly.
This failure is usually caused by the monitor or graphics card not supporting high resolution. When the screen is displayed, you can switch the startup mode to the safe mode, then enter the display settings under Windows 98, and click the "Apply" and "OK" buttons in the color state of 16. Restart, delete the graphics card driver in the normal mode of Windows 98 system, and restart the computer. You can also edit the system. INI file in pure DOS environment, change display.drv = pnpdrver to display.drv=vga.drv, save and exit, and then update the driver in Windows.
Common Fault 3: Abnormal color display
This failure usually has the following reasons:
1. The graphics card has poor contact with the display signal line.
2. The monitor itself is out of order
3. Some softwares have abnormal colors when running, which are common in old machines. There is an option to check the color in the BIOS, so just turn it on.
4. The graphics card is damaged;
5. The display screen is magnetized, generally because it is too close to a magnetic object, and it may also cause the display screen to deflect after magnetization.
Common Fault 4: Crash
This kind of fault is generally seen in the incompatibility or poor contact between the motherboard and the graphics card; Incompatibility between graphics cards and other expansion cards can also lead to crashes.
Common fault 5: Abnormal spots or patterns appear on the screen.
This kind of fault is generally caused by a problem with the video memory of the graphics card or a poor contact between the graphics card and the motherboard. Need to clean up the gold finger of the graphics card or replace the graphics card.
Common faults = = = key? Hey? br/>；
The graphics card driver is loaded and automatically lost after running for a period of time. This kind of fault is generally due to the poor quality of the graphics card or the incompatibility between the graphics card and the motherboard, which makes the temperature of the graphics card too high, leading to unstable operation or crash of the system. At this time, you can only replace the graphics card.
There is also a special case, that is, you can load the graphics card driver before, but it crashes when you enter Windows after loading the graphics card driver. Other models of replaceable graphics cards can be solved by loading their drivers and inserting the old graphics cards. If this failure cannot be solved, it means that the registry is faulty, and you can restore the registry or reinstall the operating system.
(6) Display items
Display of intransitive verbs
When the monitor is used for a long time, all kinds of minor faults will follow. Experts believe that solving these small problems is actually very simple, and a pair of eyes can see the problem.
Common faults 1: When the computer is turned on, the monitor screen shakes seriously, and sometimes the icons and words can't be seen clearly, but it will return to normal after a minute or two.
This phenomenon mostly occurs in wet weather, which is due to the moisture inside the display. To solve this problem completely, we can string the moisture-proof sand in food packaging with cotton thread, then open the back cover of the monitor and hang the moisture-proof sand on the tail of the neck of the CRT near the tube seat. In this way, even in wet weather, the above-mentioned "problems" will not appear again.
Common fault 2: After the computer is turned on, the monitor only hears the sound but can't see the picture, and it is dark. It will be a few minutes before the picture appears.
This is caused by the leakage of the tube socket, so the tube socket must be replaced. When the back cover is disassembled, you can see that there is a small circuit board at the tail of the picture tube, and the tube seat is welded on the circuit board. Carefully unplug this circuit board, solder the socket, buy the same socket in the electronics store, and then solder the socket back to the circuit board. Don't put the circuit board back in a hurry at this time, but take out a small piece of sandpaper and carefully wipe the protruding pins on the back of the picture tube with sandpaper. Pay special attention to the oxide layer on the pin. If you don't clean it, the old disease will recur soon. Put the circuit board back and you're done.
Common fault 3: there are always lingering interference clutter or lines on the display screen, and there are annoying noises in the speaker.
This phenomenon is mostly caused by poor anti-interference of power supply. If you are too lazy to do it, you can change to a new power supply. If you have enough hands-on ability, you can also try to replace the filter capacitor in the power supply yourself, which often works; If the effect is not obvious, you can turn the switch tube 1.