Why does my computer screen flash when the weather is hot? Ask experts for advice.
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 smells its sound but doesn't see its 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. After disassembling the back cover, 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.
Let's go 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. At this time, don't rush to put the circuit board back. First, find 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 practical experience.
Force, 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 replace the switch tube together.
Let's go
Common fault 4: display screen.
This problem is mostly caused by the graphics card. If it is a new graphics card, it may be that the quality of the card is poor or incompatible and the correct driver is not installed. If the old card has added video memory, it may be caused by the different model parameters of the newly added video memory and the original video memory.
Common fault five: the display screen is black.
If no signal is transmitted to the display due to the damage of the graphics card or the disconnection of the display, the indicator light of the display will keep flashing, indicating that no signal is received. If the resolution is set too high, a black screen will appear when the resolution exceeds the maximum resolution of the display, and the display will be damaged in severe cases. However, today's monitors have a protection function, and the resolution will be automatically protected if it exceeds the set value. In addition, hardware conflicts can also cause black screens.
CD-ROM drive
Optical drive is one of the accessories with the shortest service life in computer hardware. In fact, many scrapped optical drives still have great use value, as long as they are repaired a little. This usually does not require any advanced radio expertise, nor does it require the use of any complicated maintenance tools and materials. As long as you carefully observe the fault phenomenon and refer to the following troubleshooting methods, I believe your old CD-ROM drive can still restore its former "elegance".
Common fault 1: the hard disk light keeps flashing when the optical drive is working.
This is an illusion, but it is not. The hard disk light flashes because the CD-ROM drive and the hard disk are connected with an IDE interface, and the CD-ROM also controls the hard disk light when working. The optical drive unit can be independently connected to the IDE interface.
Common failure 2: When operating the CD-ROM drive in Windows environment, it displays "32-disk access failed" and then crashes.
Obviously, the 32-bit disk access of Windows has a certain influence on the CD-ROM drive. Most CDs are connected to the IDE interface of the hard disk, which is not supported.
Windows' 32-bit disk access function caused Windows to crash due to an internal error. After entering Windows, double-click "Control Panel" in the "Main Group" to enter the "386 Enhanced Mode" setting, click the "Virtual Memory" button and then click "Change" to close the "32-bit disk access" verification box in the lower left corner. After confirmation, restart Windows, and then access the CD correctly in Windows.
Common fault 3: the optical drive can't read the disc normally, and the screen shows: "There is no disc on drive X, please insert a disc and try again" or "CDR 10 1: No".
Ready to read drive x abort. Try again. Failure? "Occasionally, I watched the dish several times in and out of the box, but I didn't see it for long.
In this case, the virus should be detected first, and the whole machine should be checked and disinfected with anti-virus software. If no virus is found, you can use file editing software to open "CONFIG". SYS "file to see if the CD-ROM drive hangs and the drive is damaged, and then handle it. You can also use text editing software to check whether there is "MSC dex. exe/d:mscdoo/m:
Common fault 4: read and write errors or no disk prompts when using the optical drive.
This phenomenon is mostly caused by operating the optical drive before changing the disk. All operations on the CD-ROM drive must wait until the CD-ROM indicator light is just in place. When playing a DVD, you should also set the time to zero before changing the disc to avoid the above errors.
Common fault 5: the picture is paused or broken when playing the movie VCD.
Check "SMARTDRV" in AUTOEXEC. Bat files are placed after MSCDEX.EXE. If so, you should put the SMARTDRV statement
Before arriving in MSCDEX.EXE; Don't use the high-speed CD-ROM drive between the party and the masses to refresh the program, use SMARTDRV.EXE/U;. Substitution can eliminate the fault.
Common fault 6: When the optical drive reads data, it sometimes fails to read and the reading time becomes longer.
The hardware failure of CD-ROM drive is mainly concentrated on the laser head assembly, which can be divided into two situations: one is that the laser tube is aging due to too long use.
Change; The other is that the surface of photoelectric tube is too dirty or the lens of laser tube is too dirty and deformed. Therefore, when adjusting the power of laser tube, it is necessary to clean the lens of photoelectric tube and laser tube.
The cleaning method of photocell and focusing lens is: unplug a set of cables connecting the laser head assembly, remember the direction, and disassemble the laser head assembly. At this time, you can see that the sheath covers the focusing lens of the laser head. After removing the sheath, you will find that the focus lens is connected with the focus tracking coil through four thin copper wires, and the photoelectric cell assembly is installed in the small hole directly below the lens. Wrap cotton with fine iron wire and wipe it with a small amount of distilled water (alcohol is not allowed to wipe the surface of photocell and focusing lens), and see if the lens is hung horizontally against the laser tube, otherwise it must be adjusted. At this point, the cleaning work is completed.
Adjust the power of the laser head. There are 1 small potentiometers similar to cross screws on the side of the laser head assembly. Record its initial position in color. Generally, it should be rotated clockwise by 5 ~ 10, but not counterclockwise when the machine is installed, until the disk can be read smoothly. Be careful not to rotate too much to avoid burning out the photovoltaic cell because of too much power.
Common fault seven: the CD-ROM drive can't be detected or failed to be detected when it starts.
This may be caused by loose connector of data cable of CD-ROM drive, damaged data cable of hard disk or wrong jumper setting of CD-ROM drive. When confronted with this problem,
Wait, first check whether the data cable connector of the CD-ROM drive is loose. If you find that it is not plugged in properly, plug it in again. If this still doesn't solve the problem, then we can try to find a new data cable. At this time, if the fault still exists, we need to check the jumper setting of the CD, and if there is an error, we can change it.
hard disc
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 another mode 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 Windows 2000 system, hang up the damaged hard disk, and start it up, because Windows 2000 guarantees the system hardware.
The stability of will scan the newly connected hard disk. CHKDSK, a hard disk scanner for Windows 2000, is used for hard disks damaged for various reasons.
The repair ability is good, and the hard disk is basically repaired 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.
display 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 in a pure DOS environment without entering safe mode.
System. INI file, after changing display.drv = pnpdrver to display.drv=vga.drv, save and exit, and then update in Windows.
Driver.
Common fault 3: The color display is abnormal, and such faults generally have 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 monitor.
Card.