Common faults of computer optometre?

Computer refractometer, as a widely used equipment in modern ophthalmology diagnosis and treatment, often encounters various failures. PHP editor Zimo will introduce in detail the causes, manifestations and solutions to common faults of computer optometrists to help everyone deal with faults in a timely manner and ensure the accuracy and efficiency of optometry examinations.

1. Common faults of computer optometre?

The following situations may occur. The optometre may malfunction. Domestic optometrists are very poor and often have problems. There may also be problems with your refractive medium, such as corneal stains, lens turbidity, vitreous turbidity, etc. It is recommended that you go to the hospital for optometry in the future. In this case, you can do retinoscopy. Non-professional optometrists basically cannot master this technology. Moreover, hospital optometry is not expensive. After the optometry, you can go to an ordinary optical shop to get glasses. If the hospital can't test it, then you have to see an ophthalmologist.

2. How to repair common computer refrigerator faults?

1. No cooling

Whether the power plug of the refrigerator is plugged in; whether the power socket has power; and whether the power circuit breaker is disconnected. Check whether the refrigerator door light is on to determine whether the refrigerator is connected to power. Check whether the thermostat is in the working gear. The thermostat has a stop gear (0 gear). The compressor will not work if it is placed in the stop gear. If the above items are normal, please contact maintenance personnel to solve the problem.

　2. The door body is not straight

　In this case, just adjust the door hinge to straighten the door. Loosen the lower hinge screws of the refrigerator, adjust the door position, and then tighten the screws. Loosen the middle hinge screw of the refrigerator, move the door left and right, and tighten the screw after adjustment.

　3. The light does not light up

　If the light bulb is broken, just replace it. In addition, the door light switch has a mechanical failure that does not spring up and cannot be turned on. It can be restored by gently pulling it with your hand. The fault caused by the burrs blocking the edge of the button on the door light switch can be eliminated by scraping off the edge burrs with a small blade. The door light switch of the refrigerator is activated by a small pressing piece, which requires removing the plastic cover. After taking out the pressing piece and the door light switch, first snap the pressing piece into place, then install the door light switch. Once the plastic cover is installed, the fault will be eliminated.

3. Common faults of Fox computer board?

Common faults include the following:

1. The computer board cannot start or a black screen appears when booting. This is usually caused by bad memory modules, hard drive failure, motherboard damage, etc. You can try to re-insert and unplug the memory module, replace the hard drive or check whether there is a problem with the motherboard.

2. Blue Screen of Death. Blue Screen of Death may be caused by software issues, hardware damage, driver incompatibility, etc. You can try to fix the problem by repairing the system, updating drivers, or replacing hardware.

3. The computer is running slowly. It may be caused by computer viruses, insufficient memory, application conflicts, etc. You can try to use anti-virus software to clean viruses, increase memory, close non-essential applications, etc. to solve the problem.

4. The computer board makes abnormal noises. It may be caused by power failure, fan failure, etc. You can try replacing the power supply or fan to solve the problem.

5. The USB interface cannot be recognized. It may be caused by USB driver issues or unstable power output voltage. You can try updating the USB driver, replacing the power supply, etc. to solve the problem.

These are common faults of Fox computer boards. If you encounter these problems, you can troubleshoot and solve them according to the above methods. If it cannot be repaired by yourself, it is recommended to contact professional maintenance personnel.

4. Common faults in computer power supply repair?

Computer power failure generally has the following phenomena:

Fault 1. There is power output but no display when turned on

Fault phenomenon: There is power output in the computer, but no display when turned on.

Analysis and solution: The possible reason for this failure is that the delay time of the RESET signal input by POWERGOOD is not enough, or POWERGOOD has no output. After starting up, use a voltmeter to measure the output terminal of POWERGOOD. If there is no +5V output, check the delay element again. If the device has +5V, just replace the delay capacitor of the delay circuit.

Fault 2. It will automatically restart every time it is turned on

Fault phenomenon: The computer will automatically restart once every time it is turned on, but now it needs to repeat the self-test before entering the operating system.

Analysis and solution: Rebooting at startup is usually caused by a motherboard failure. Unstable power output may also cause this. Check these two devices.

Fault 3. There is a ignition in the case and the indicator light of the monitor power supply flashes at the same time.

Fault phenomenon: There is a ignition in the case and the indicator light of the monitor power supply flashes.

Analysis and solution: It is very likely that it is a problem with the power supply, because it is difficult for other accessories in the chassis to cause this problem. This means that the components inside the power supply are damaged or short-circuited, so go to a professional for repair or repair. Replace the power supply with a new one.

Fault 4. The computer will automatically shut down after just a few minutes of being turned on

Fault phenomenon: The computer is configured with PENTUM3 700, MSI motherboard, modern 128MB, MAZTOR hard drive. Recently, the computer will automatically shut down every few minutes after being turned on. The indicators on the host, optical drive and monitor are all on, and the fan is running. , but there is no response. Only by turning off the power and restarting can it work normally.

Analysis and solution: After the power supply has been working for a period of time, the heat will become larger, and some components will work unstable, causing the output current to be cut off, so the power supply needs to be repaired.

Fault 5. The host power is automatically turned on when the power switch is turned on

Fault phenomenon: The computer boot sequence is reversed. Normally, the monitor and host should be started manually one by one, but the host power is automatically turned on when the power switch is turned on. .

Analysis and solution: It is very likely that the problem is caused by the settings in the BIOS. In this way, first enter the BIOS of the motherboard to set up, and listen to a function of the PWERON AFRER POWERFALL option in POSERMANAGERMENT to turn off the problem.

Fault 6. You need to remove the power plug and plug it in before restarting

Fault phenomenon: In offline state, when checking QQ messages and letters in FOXMAIL, the computer will suddenly shut down. At this time, the computer will shut down suddenly. There is no response from the power switch. And be sure to remove the power plug and plug it in again before restarting.

Analysis and solution: It is likely that there is a problem with the automatic protection circuit of the power supply. Check whether the mains power is stable. In addition, you can use another power supply first to see if it is caused by the power supply itself.

Fault 7. Restarting during the shutdown process

Fault phenomenon: Recently, every time the shutdown is in progress, after the screen shows that it is shutting down, it will automatically restart. In addition, sometimes it will automatically restart after entering WINDOWS98 after booting.

Analysis and solution: This is due to a bug in the energy control function of WINDOWS98. If so, you need to install the relevant shutdown patch of WINDOWS98 to solve this problem. If you restart just after entering WINDOWS98, the motherboard is faulty or It is caused by improper current output of the power supply. You can turn off the advanced management of the power supply in the WINDOWS system control panel.

5. What are the common faults of computer power supply?

　 1. Fault type: No output from the power supply This type of fault is the most common, and the main manifestation is that the power supply does not work. When the host confirms that the power cord is connected (some power supplies with AC switches need to be turned on), there is no response when turning on the computer, and there is no display on the monitor (the monitor indicator light flashes). No output faults are divided into the following types: ① +5VSB has no output. As mentioned before, +5VSB should have a normal 5V output as soon as the host power supply is connected to AC power and supply power to the motherboard startup circuit. Therefore, there is no output from +5VSB, the motherboard startup circuit cannot operate, and the computer cannot be started. The method to determine this fault is: remove the power supply from the host, connect the host power AC input line, and use a multimeter to measure the voltage of the purple line (+5VSB) output from the power supply to the 20-pin plug on the motherboard. If there is no output voltage, it means The +5VSB line is damaged and the power supply needs to be replaced. For some motherboards with a standby indicator light, if there is no multimeter, you can also use whether the indicator light is on to determine whether there is output from +5VSB. This kind of fault indicates that there is damage to the internal components of the power supply, and the fuse is probably blown. ②+5VSB has output, but the main power supply has no output. In this case, the standby indicator light is on, but there is no response after pressing the power button, and the power supply fan does not move. This phenomenon shows that the fuse is not blown, but the main power supply is not working. The fault determination method is: remove the power supply from the host, short-circuit the 20-core green wire (PSON/OFF) to the ground or connect a small resistor to the ground to make the voltage below 0.8V. At this time, the power supply still has no output and If there is no sign of the fan rotating, it means that the main power supply is damaged and needs to be replaced. ③+5VSB has output, but the main power supply is protected. There are many such situations. This phenomenon can be caused by the manufacturing process or early failure of the device. The difference between this phenomenon and ② is that the fan will vibrate when the power is turned on, that is, the power supply has output, but protection occurs due to a fault or external factors. In order to rule out short circuit or other factors due to damage to the power load (motherboard, etc.), you can remove the power supply from the host and short-circuit the 20-pin green wire to ground. If the power output is normal, it may be: I. The power supply is damaged due to damage to the power load. To protect, replace the damaged power supply load; II. The internal abnormality of the power supply causes protection and the power supply needs to be replaced; III. The power supply and load have poor compatibility, resulting in protection under a specific load. This situation requires further analysis. ④The power supply is normal, but the motherboard does not give a power-on signal. In this case, the power supply has no output. You can use a multimeter to measure whether the voltage of the 20-core green line to ground drops below 0.8V after the host is turned on. If it does not drop or does not Below 0.8V, the power supply may fail to turn on. 2. Fault type: The power supply has output, but the host does not display it. Tip: This situation is more complicated and difficult to determine, but you can consider the following aspects: 1) One or more of the output voltages of the power supply are abnormal, which can be tested with a multimeter; 2) There is no P.G signal , that is, measure whether the gray line in the 20-core wire is high level. If it is low level, the host will always be in reset state and cannot be started. 3) The rising edge or timing of the power supply output is abnormal, or the compatibility with the motherboard is not good, which can also cause the host to not display. However, this situation is more complicated and needs to be analyzed with the help of a storage oscilloscope.

6. Lenovo computer repair: How to quickly solve common Lenovo computer faults

Lenovo computer repair: How to quickly solve common Lenovo computer faults

As a well-known computer brand, Lenovo computers are highly consumed for their stability and performance. favored by those. However, during use, Lenovo computers will also encounter various malfunctions. This article will introduce you to some common Lenovo computer failures and provide corresponding repair solutions to help you quickly solve the problem and restore normal use.

FAQ 1: Lenovo computer has a black screen when it starts up

When you try to start up your Lenovo computer, you find that the screen is black. This may be caused by a problem with the monitor connection or a system failure. First, you can try reconnecting the monitor's data cable to make sure the connection is secure. If the problem persists, you can try to enter safe mode to repair the system. If safe mode cannot solve the problem, you may need to consider system reinstallation.

FAQ 2: Lenovo computer suddenly crashes

During use, Lenovo computer suddenly crashes is a relatively common problem. This could be due to a hardware protection mechanism being triggered due to overheating, or it could be a software conflict causing the system to crash. For this problem, you can try cleaning the radiator, replacing thermal grease, and optimizing system startup items to solve the overheating problem. You can also solve the software conflict problem by uninstalling conflicting software and updating drivers.

FAQ 3: Lenovo computer blue screen or system crash

Blue screen or system crash is one of the problems that users often encounter when using Lenovo computers. This may be due to hardware failure, driver issues, or corrupted system files. To deal with this problem, you can try to solve it by checking the hardware connection, updating or rolling back the driver, repairing the system file, etc. If the problem persists, you may want to consider contacting professional maintenance personnel or official Lenovo customer service for help.

Summary

When using Lenovo computers, the faults described above are only some of the problems that may be encountered, and the solutions are only a common way. If you encounter a problem that cannot be solved, it is recommended that you contact Lenovo customer service or seek professional repair services in time to avoid more serious damage caused by improper personal repairs. I hope this article can help you better understand Lenovo computer repair related knowledge and ensure that your Lenovo computer can run efficiently and stably.

Thank you for reading this article. I hope this article can provide you with some help when solving Lenovo computer problems.

7. Common computer faults and solutions

Classification of computer faults

With the widespread use of computers in our lives and work, encountering computer faults has become the norm. Computer failures can be divided into two types: hardware failures and software failures.

Hardware failure

Black screen: nothing is displayed on the screen after the computer starts.

Check if the power connection is loose. Try unplugging and reinserting the graphics card. Check whether the memory is plugged in tightly.

Blue screen: The computer displays a blue screen prompt and automatically restarts.

Check whether the memory is damaged and try to replace the memory module. Check the hard disk for errors and run a disk detection tool to fix them. Check to see if new hardware or software has been installed recently, and if so, try uninstalling or disabling them.

Software Failure

System Crash: The computer operating system cannot run properly.

Try to start the computer in safe mode and perform system repairs. Reinstall the operating system. Make sure your computer has the latest system updates installed.

Slowdown: The computer's running speed drops significantly.

Clean unnecessary files and programs from your computer. Run anti-virus software to check the system. Add memory modules to improve computer performance.

Summary

Computer faults are common problems we encounter when using computers, but with some simple methods we can solve most common faults by ourselves. I hope that the methods I provide can help readers solve computer problems and improve work and life efficiency.

Thank you for reading this article. I believe that the methods provided in this article can help you better deal with computer failure problems.

8. Common faults of microwave oven computer board?

There are two situations: 1. The described phenomenon occurs without closing the door, and the sound is during normal operation (there is a loud vibration of the pressure transformer during operation |), which is very dangerous, indicating that the microwave may completely leak, and it is recommended to stop immediately Use, otherwise microwaves will be very harmful to the human body. This situation is rare.

2. The described phenomenon occurs when the door is closed, that is, the door lock microswitch does not reset and is damaged. It may also be that the computer board breaker is damaged (at least the microwave will not leak when the door is closed, which is safe. At this time, you still need to listen to the sound. Whether it is the sound during normal operation), generally the door hook has several sets of micro switches. Judging from your description, it should be the second situation. If it is the first situation, it is very dangerous!

9. Common computer host faults and how to deal with them?

First, the problem of leakage. We often get electric shock when touching the host. This is because during the power supply process, some components form a path with the chassis, causing leakage. A common solution is to first check whether there is a quality problem with the power supply. If there is a problem, quickly replace the power supply with a new one. Secondly, if it is not a quality problem, you can connect a ground wire to complete the discharge work.

Second, there is a serious smell inside the case. Don't take it lightly, be sure to carefully check each component in the chassis. If there is any burnt phenomenon, it is mostly caused by a power supply problem, because too high or too low voltage will cause the components to burn. Use a multimeter to measure the power pins. If there is a problem with the power supply voltage, replace it in time.

Third, it cannot be turned on normally. After booting, only the CPU fan runs. And it often crashes, and the software part has been checked and there is no problem. At this time, it is necessary to check whether there is a problem with the power supply. Similarly, use a multimeter to check whether the voltage and other parameters of its pins are up to standard. If there is a problem, it is best to replace it in time to avoid secondary damage to other components.

Fourthly, pressing the power button will not shut down the device, but selecting the shutdown button in the menu will shut down the device. This is a CMOS setting problem. Just enter the CMOS and select the BIOS option to set it.

Fifth, there is sparking behind the host power supply. During this period of time, this problem always occurred in our computer room, and after inspection, there was no problem with the power supply. Later, after inspection, it turned out to be a problem with the power cord. The quality of the power cord sometimes directly affects the host power supply. The only solution is to buy new ones, and the price is about 10 yuan a piece.

Sixth, start the fire in the host. It is generally difficult for other components in the host to spark. Most of the reasons occur in the power supply. Sparks are caused by short circuits in the internal components of the power supply. The solution is to send it to a repair shop or replace it with a new one.

Seventh, the fan inside the chassis rotates too loudly. Turn on the host and check. There is basically no sound from the CPU fan and graphics card fan. The sound is undoubtedly coming from the power supply. The solution is to disassemble the power supply and clean the dust on the power supply fan. This problem can basically be solved.

10. Guide de réparation et pannes matérielles informatiques courantes

Les ordinateurs sont un outil indispensable dans la vie moderne et des pannes matérielles surviennent de temps en temps. En tant qu'éditeur de sites Web professionnel, je vous présenterai en détail les pannes matérielles informatiques courantes et les méthodes de réparation pour vous aider à mieux comprendre et entretenir votre ordinateur.

Analyse des pannes matérielles courantes et de leurs causes

1. L'ordinateur ne peut pas être allumé

Panne de courant : vérifiez si le cordon d'alimentation est correctement connecté, si l'interrupteur d'alimentation est allumé et si le voyant d'alimentation est allumé. Panne de la carte mère : il y a un problème avec des composants clés de la carte mère tels que le processeur, la mémoire, etc., et la carte mère doit être remplacée. Panne du disque dur : le disque dur est endommagé ou le câblage est desserré. Le disque dur doit peut-être être remplacé.

2. Erreur d'écran bleu

Conflit de pilotes : vérifiez s'il existe des pilotes nouvellement installés qui sont incompatibles avec le système. Panne de mémoire : il y a un problème avec le module de mémoire. Vous pouvez essayer de remplacer le module de mémoire. Infection virale : il peut y avoir des logiciels malveillants dans l'ordinateur et celui-ci doit être désinfecté.

3. L'ordinateur surchauffe

Mauvais refroidissement : le ventilateur est défectueux ou le dissipateur thermique est poussiéreux. Il doit être nettoyé et le fonctionnement du ventilateur doit être vérifié. Overclocking du processeur : le processeur fonctionne au-delà de la fréquence de sécurité et la fréquence du processeur doit être ajustée. Capacité d'alimentation insuffisante : l'alimentation électrique ne peut pas répondre à la charge de l'ordinateur et doit être remplacée par une alimentation plus grande.

Méthodes de maintenance du matériel

Compte tenu des défauts courants ci-dessus, nous pouvons prendre les mesures de maintenance suivantes :

Vérifiez le matériel clé tel que l'alimentation, la carte mère, le disque dur, etc. pour confirmer la cause du défaut. En fonction de la cause du défaut, choisissez la méthode de réparation appropriée, comme le remplacement de pièces ou la réinstallation du système. Faites attention à la sécurité opérationnelle et utilisez les outils de maintenance de manière rationnelle pour éviter des dommages supplémentaires. Une fois la réparation terminée, effectuez une inspection complète de l'ordinateur pour vous assurer que toutes les fonctions sont normales.

Grâce à l'introduction ci-dessus, je pense que vous avez une compréhension plus approfondie des pannes et des réparations courantes du matériel informatique. Si vous rencontrez des problèmes lors de l'utilisation de votre ordinateur, n'hésitez pas à me contacter et je ferai de mon mieux pour vous fournir une aide et des conseils professionnels. Merci d'avoir lu et vous souhaite une bonne utilisation

!

The above is the detailed content of Common faults of computer optometre?. For more information, please follow other related articles on the PHP Chinese website!