【 Weak current college 】 computer failure judgment (4)

Displays the type of failure
First, define an example
Such a failure not only contains the given display device or part of the fault arising, also contains other parts caused by the poor in the display area is not normal. In other words, display of fault is not necessarily due to the display device, should be observed and judged.

Second, the possible failure phenomenon
1. power on the no display, display sometimes or often power;
2, display partial color, jitter or scrolling, shows a deficiency, video, etc.;
3, in a certain application or configuration under the video, dark (or even a black screen), Ghost, panic, etc.;
4. screen parameter cannot be set or modified;
5, brightness or contrast not adjustable or adjustable range is small, the screen size or location cannot be regulated or small;
6, sleep, wake up after the show the exception;
7, monitor the unusual smell or a voice.

Third, the part may be involved
Monitor, graphics card and their settings; motherboards, memory, power supplies, and other related parts. Particular attention to the computer peripheral equipment and geomagnetic disturbance on the computer.

IV. judgments points/order
1. preparation before maintenance
The display card in the latest version of driver
2, environmental checks
Check: 1) power supply
A. AC voltage is 220V ± 10%, 50 Hz or 60 Hz; power stability;
B. the remaining reference power class in the power check failure.

2) connection to check:
A. monitor and hosts connections to laminate, correct (pay particular attention, when there are two display ports that are connected to the correct display port); cable connector pins deformation, fracture, and other phenomena, care should be taken to check the quality of the display cable is intact;
B. monitor is properly connected to market power, its power indicates whether correct (lit and color);
C. display device is not the exception, the grounding line.Special Note: do not allow computer maintenance engineer for users to install ground, should please users through formal electrician to install;

3) peripheral and host environment checking:
A. check the environmental temperature and humidity are consistent with manual (e.g. corrugated tube, diamond requirements use temperatures of 18 ~ 40C);
B. monitor powered whether there is a smell, the smoke or abnormal noise (such as popping, etc.);
C. display card components for deformation, discoloration, or excessive temperature;
D. display card is plugged in, you can use to plug in, with rubber or alcohol to clean the display card (including other boards) of Goldfinger part to check; host of dust is greater, for clear;
E. the surroundings for disrupting chemicals exist (these disruptors including: fluorescent lamps, UPS, the box, hair dryer, huddling too close (50 centimeters) of other monitors, and other high-power electromagnetic devices, cables, etc.). Note that the monitor's display direction may also be due to the influence of geomagnetism and interfere with the display device;
F. for partial color, jitter and other symptoms, you can change the monitor's direction and location, check the symptoms can disappear.

4) additional checks and notes:
A. host powered, whether there is a good post and run actions (such as a post completed chirping, the hard drive led is not flashing, etc.) and, if so, focus on the monitor or display card check;
B. Prohibition of live moving the monitor and monitor orientation, powered by a period of time (2 to 3 minutes) it is best not to move the display.

3. fault points
1) adjust the monitor and graphics card:
A. by adjusting the monitor's OSD option, it is best to reply to RECALL (factory State) status to check whether the fault. For LCD monitors, the touch of a button; autoconfig
B. display parameters are transferred too high or too low (such as H/V-MOIRE, that cannot be recovered by RECALL);
C. display all buttons can adjust the adjustment range is offset the monitor's specifications;
D. display unusual sound or abnormal odor, whether out of the monitor specifications of requirements (such as new monitor just used, there will be abnormal odour; power because of the reasons causing the degauss sound, screen jitter, etc, but these are normal). The monitor's specifications, please see Appendix II (2);
E. display card specifications are available at the host (such as AGP2.0 card is available in a host of AGP slot intermediate).

2) BIOS configuration adjustments:
A.BIOS is setting in and the current use of the display card type or the monitor connected location match (that is, use the on-board video card, or an external display card; is AGP display card or PCI display card);
B. do not support auto-assign display memory onboard display card, you will need to check the BIOS displays the memory size meets the needs of the application;
The following checks must be in software minimum system.

3) check the monitor/card driver:
A. monitor/card drivers and display device matching, version is appropriate;
B. display driver is correct, if you have a manufacturer-supplied drivers, it is best to use the manufacturer's driver;
C. whether the appropriate DirectX drivers (including motherboard driver);
D. If the system is equipped with DirectX drivers, available which provide the Dxdiag.exe command check display system is faulty. The program can also be used to carry out checks on the sound card device.

4) displays the properties and resources check:
A. check the Device ManagerAre there any other device with a display card resource conflicts, if any, first remove the conflicting device;
B. display the properties of the settings are appropriate (such as an incorrect monitor type, refresh rate, resolution and color depth, etc, can cause ghosting, blur, corruption, jitter, even black phenomenon);

5) operating system configuration and the application of check:
A. system configuration files (such as: the System.ini file) the appropriateness of the setting;
B. display card specifications or display driver functionality supports the needs of the application;
C. the existence of other software and hardware conflicts.

6) hardware check:
A. when the display adjusts normal, other components should be added individually to check what part causes display does not function properly;
B. replace the different models of graphics card or monitor, check for matching issues between them;
C. by replacing the corresponding hardware check whether due to a hardware failure causes display is not working properly (recommended replacement order is: display card, memory, motherboard).

5. case
Case 1:
Problem description: come across such a machine, a comparison of strange phenomena, models for the Moon 2000PIII/800, failure to regular post no display, display system can sometimes, but uses 1-2 hour will panic, restart without display, only too long to boot, it can display.

Solution: encounter this issue, first determine whether it should be a hardware problem, opening the chassis, view the Board did not loose (Note: video cards and motherboard slots on Lenovo stick, stick it tight), change on it, has been replaced in the memory, CPU, power supply, does not resolve the problem, then replaced the motherboard, remove the video card and the motherboard socket tore Association posted article, feel the video card is not inserted into place, press down, then went in, was suspected is not a bad video card and the motherboard, so the machine's original parts were restored, commissioning, everything is normal.

PostScript: this case is that the video card of the bad, the weird, the maintenance because of omissions detected (view only plug, but if the video card is not the actual hands-on check), resulted in the maintenance process cumbersome.

Case two:
Problem description: a moon machines, users call each time you start are unable to enter the WIN98, cursor flashing in the upper-left corner of the screen, panic, but you can enter safe mode.

Solution: suspected video card or monitor settings to improper, into safe mode to display resolution is set to 640 * 480, color is set to 16 colors, restart, can enter in normal mode, but as long as the changes to the resolution or color, the machine will not start correctly; see the inside of the machine, in addition to the user from adding a network adapter, no other configuration is the network card came into conflict with the video card?, unplug the adapter to WIN98 boot properly, to change the network card slot, power on the system detects a new hardware, and loads the driver, start, everything is normal.

PostScript: as the video card is not compatible with the other parts or panic caused by the conflict, it is entirely possible to use minimal system approach to test (the smallest system of law that is, only the motherboard, CPU, video card, power and other major components), the first rule out major parts, and then one by one to detect other expansion cards.

Case 3:
Problem description: the Delta Force-Earth warriors, 810 (e) series motherboard running on the machine (with the Jubilee, daily series), such as random strip display driver installation (using random disk to the driver installation is our consistent style), when entering the game screen, inevitably lead to panic.

Solution: the solution is to download the new version of the driver, perform the upgrade.

PostScript: If you encounter in the actual repair 3D games panic, estimate might be video card failure, and no spare parts replaced (it is in our home maintenance, is often encounter), may wish to download a Directcontrol software through the it screened off AGP support. Play 3D games, such as not to panic, description of the problem is most likely elsewhere (suchas motherboards, memory). Such as panic, to a large extent, this video card is faulty.

Case 4:
Fault description: open days 2200P4/1.7G (QDIP7LI-AL motherboard), running huaguang Super en Group Edition software (with an ISA encryption card), such as zoom, the left boundary cannot be displayed.

Solution: the user new machine, the agent in to the user to install the hyper-en Group Edition software problems. For a new machine, the fault persists, Deputy judge for the huaguang ISA card is not compatible with this model, so that the repair station on-site. To the user, the reappearance of failure, a PCI video card appears normal, estimated not to machine failure. In system properties — properties — graphics hardware acceleration in the lower two cells, problem solving.