Encountering a network structure failure is a headache. PHP editor Zimo will delve into this common problem and help you solve the problem easily. This article will provide a series of practical tips and solutions, from checking hardware connections to troubleshooting software problems, guiding you step by step to repair the network structure and restore smooth connections.
How to repair common faults of network structure?
In actual work, we often encounter network failures. Most of these failures are caused by connection errors. When a certain node in the network has a problem, the network will be blocked or even disconnected. .
Therefore, the network topology must be checked and any fault must be dealt with promptly.
So how to determine whether the network card connection is correct?
If you find that the network card does not have a driver installed or other software is installed, please check whether the network card is properly connected to other computers.
If the computer can access the Internet but does not work properly when connected to the switch, then you can try to replug the network card and network cable to test.
When the network is unavailable, we can unplug all the network cables on the switch and restart the switch.
But sometimes not all network cables can be automatically recognized. If the driver is not installed, it is likely that you will not be able to access the Internet.
1. Analysis of network topology failure causes
The physical port of the switch is a very important part of the network, and it plays a very important role in network connection.
When a hardware device fails, data packets will not be transmitted normally through the network. If the physical port of the switch is replaced with another device, data packets will not be transmitted normally through the network.
If the switch hardware is not checked, it is generally impossible to determine whether there is a problem.
When the computer is in a LAN and cannot access the Internet normally, you can first check whether the router or switch software is installed on the computer.
If after installing the corresponding network software, there are still problems such as being unable to access the Internet or browsing the web, it means that the problem may occur in the network topology.
At this time, you can also check which network software (including drivers) is installed on the computer to solve this type of problem.
2. Analysis of the reasons why network cards and other devices cannot be recognized.
There are many phenomena of this kind of failure, which often appear as follows:
The computer can access the Internet, but cannot log in when connected to the switch;
The computer connected to the switch cannot Communicate with other computers;
The network card light flashes, but you cannot see the relevant information of the network card (such as network address, MAC MAC address, etc.), there is no driver installation, and there is no software update (such as Thunder, QQ, etc.) .
3. Redial the dial-up connection and check whether the network line is smooth.
If the network line is not smooth, the computer will have a blue screen or cannot access the Internet.
General network cable problems are one of the most common reasons. In actual operation, if the user's network line is not smooth, it is easy to cause system errors.
So it is necessary to conduct a comprehensive inspection of the switch and broadband lines, and deal with them in time when problems are discovered, so as to ensure the normal use of the network.
The following types of network failures are often encountered in practical applications:
[Table]
4. Use firewalls to detect whether there are abnormal connections in routers and switches.
Generally, switches are equipped with firewall functions. Just install the software on the switch.
(1) Set up a secure router:
Set as a firewall, click to enable safe mode, in safe mode, network access will be enabled;
(2) Use DHCP client to maintain the network: you can set the router's The IP address and subnet mask are saved as DHCP to maintain the network.
1. First of all, it may be that the network of the current device is faulty. Check whether the current device can connect to the Internet. For example, if IPv6 itself does not have Internet access rights, but an IPv6 address is pinged, this situation will occur;
2. In addition, it is possible that a service named Teredo is not enabled when pinging an IPv6 address. In this case, you can enter on the command line:
(1) Enter and press Enter to execute: netsh interface Teredo set state disable command;
(2) Enter and press Enter to execute: netsh int ter set state enterpriseclient command;
(3) Check the service status at this time, enter and press Enter to execute: netsh int Teredo show state command;
(4) The type is not " Disabled" will be turned on;
(5) At this time, you can try Ping again to see if the problem is solved;
1. Fault phenomenon: The network adapter (network card) settings conflict with computer resources.
Analysis and Troubleshooting: Avoid conflicts with other computer resources by adjusting the IRQ and I/O values in the network card resources. In some cases, it is necessary to adjust the conflict with other resources by setting jumpers on the motherboard.
2. Fault phenomenon: Other client computers in the LAN can see each other on "Network Neighborhood", but only one computer cannot be seen by anyone, and it cannot see other computers. (Premise: The LAN of the Internet cafe is connected to a star network structure through a HUB or switch)
Analysis and troubleshooting: Check whether the computer system is working normally; check the network configuration of this computer; check whether the network card of this computer is normal work; check whether the network card settings on this computer conflict with other resources; check whether the network cable is disconnected; check whether the network cable connector contact is normal.
3. Fault phenomenon: There are two network segments in the LAN, and all computers in one of the network segments cannot access the Internet. (Premise: The Internet cafe's LAN connects two network segments through two HUBs or switches)
Analysis and elimination: The trunk lines of the two network segments are broken or the connectors at both ends of the trunk line are poorly connected. Check the settings of the network segment in the server.
4. Symptom: All computers in the LAN can see each other on "Network Neighborhood". (Premise: The LAN of the Internet cafe is connected to a star network structure through a HUB or switch)
Analysis and troubleshooting: Check whether the HUB or switch is working properly.
5. Fault phenomenon: A client in the LAN can see the server in "Network Neighborhood", but cannot access the Internet. (Premise: The server refers to the computer that acts as an agent for the Internet on other guest machines in the Internet cafe LAN, the same below)
Analysis and troubleshooting: Check the settings of the TCP/IP protocol of this client, check the settings of the IE browser in this client, Check the server settings for this client.
6. Symptom: All computers on the entire LAN cannot access the Internet.
Analysis and troubleshooting: whether the server system is working normally; whether the server is offline; whether the modem is working normally; whether the central office is working normally.
7. Fault phenomenon: Except for the server, other clients in the LAN cannot access the Internet.
Analysis and Troubleshooting: Check whether the HUB or switch is working normally; check whether the network part (including: network card, network cable, connector, network configuration) connected to the server and HUB or switch is working normally; check whether the software for proxy Internet access on the server starts normally. Run; whether the settings are normal.
8. Fault phenomenon: When dialing up to access the Internet, MODEN has no dial-up sound, cannot connect to the Internet, and the indicator light on MODEN does not flash.
Analysis and troubleshooting: whether the phone line is busy; whether the connection (including: connections, connectors) of the server connected to MODEN is normal; whether the phone line is normal and whether there is any noise interference; whether the dial-up network configuration is correct; whether the MODEN configuration settings are correct , check whether the tone or pulse mode of the dial tone is normal.
9. Fault phenomenon: The system cannot detect MODEN (if MODEN is normal).
Analysis and troubleshooting: Reinstall MODEN and pay attention to the correct location of the communication port.
10. Fault phenomenon: The connection speed to the Internet is too slow.
Analysis and troubleshooting: Check whether the port connection speed set in the "Dial-up Network" of the server system is the maximum value set; whether the line is normal; the connection speed can be improved by optimizing the MODEN settings; it can also be improved by modifying the registry Internet speed; whether there are many clients surfing the Internet at the same time; if there are many, it is normal for the connection speed to be too slow.
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.
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.
Common faults include the following:
1. The computer board cannot be started 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.
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 booting.
Fault phenomenon: The computer is configured with PENTUM3 700, MSI motherboard, modern 128MB, and MAZTOR hard drive. Recently, the computer will automatically shut down after just a few minutes of booting. The indicator lights 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 the PWERON AFRER POWERFALL option function in POSERMANAGERMENT and turn it off.
Fault 6. You need to remove the power plug and plug it in before restarting
Fault phenomenon: In offline mode, 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.
Repair methods for common network set-top box faults:
Common fault one: Set-top box - black screen
Fault phenomenon: The channel displays a black screen
Processing methods:
1、關機上盒電源重啟,開機後如無效,觀察機上盒面板是否有數字顯示,有，則檢查視訊線是否連接可靠,電視機是否切換到所對應的視訊狀態(AV1 AV2 AV3)，仍無效：則檢查智慧是否插錯，然後關機重新啟動。
2、按遙控器選單鍵,如電視機螢幕有顯示主選單,則可重新搜尋節目
常見故障二：機上盒—啟動失敗
故障現象：
1、機上盒顯示器上延時鐘一直在轉，數位電視畫面出不來；
2、機上盒顯示器上提示8888或0000或英文LOAD
處理方法：
1、機上盒顯示器上提示LOAD說明機上盒升級失敗。
2、機上盒顯示屏上提示8888或0000說明機上盒處於死機狀態, 可關閉機上盒電源重啟
常見故障三：機上盒—讀卡錯誤
故障現象：屏幕提示“無法識別卡”“加擾節目”“加擾節目請插入智慧卡」或「機卡未配對」。
處理方法：
1、提示“無法識別卡”、“加擾節目請插入智能卡”，可重插智能卡；
2、如重插智能卡無效或提示“機卡配對”需撥打客服熱線報修；
常見故障四：機上盒—自動重啟
故障現象：播放一段時間後機上盒會自動重啟（含點播過程中）
處理方法：關閉機上盒電源，等待片刻後再開機；常見故障
處理方法：關閉機上盒電源，等待片刻後再開機；常見故障五：機上盒—升級失敗
故障現象：軟體版本更新，無法自動更新或升級失敗；
處理方法：建議耐心等待，如昇級20分鐘仍無任何反應，則關閉機上盒電源重啟；
常見故障六：機上盒—死機
故障現象：節目定格在某一畫面，按遙控器上任何健無反應（含點播死機）
處理方法：可關閉機上盒電源，再開機。
在當今數位化時代,互聯網已經成為我們生活中不可或缺的一部分。然而,有時我們的電腦可能會遇到無法連接行動網路的問題,這無疑會給我們的工作和生活帶來不便。那麼,電腦行動網路連不上網究竟是什麼原因造成的?又該如何解決呢?讓我們一起來探討一下吧。
1. 網路卡驅動程式問題
電腦無法連接行動網路的常見原因之一就是網路卡驅動程式出現問題。如果網卡驅動程式版本過舊或出現相容性問題,都可能導致無法正常連接行動網路。
2. 網路設定錯誤
有時候,電腦的網路設定可能出現問題,例如IP位址、DNS設定等不正確,這都會影響到行動網路的連線。
3. 硬體故障
如果電腦的網卡硬體出現問題,也可能導致無法連接行動網路。例如網卡損壞、介面鬆脫等。
4. 病毒或惡意軟體感染
有時候,電腦被病毒或惡意軟體感染,也可能會影響到網路連線。這種情況下需要及時查殺病毒,恢復系統設定。
針對上述常見的故障原因,我們可以採取以下幾種解決方法:
更新網卡驅動程式。可以到電腦製造商或網卡廠商的官網下載最新版本的驅動程式,然後進行安裝和更新。
檢查並修改網路設定。例如檢查IP位址是否正確、DNS設定是否合理等,根據實際情況進行調整。
檢查網卡硬體。若網卡故障,可以嘗試更換網卡或尋求專業維修。
查殺病毒和惡意軟體。可使用專業的防毒軟體進行全面掃描和清除,確保系統安全。
重置網路設定。如果以上方法都無法解決問題,可以嘗試重置電腦的網路設定,恢復到出廠預設狀態。
透過以上幾種方法,相信您一定能夠解決電腦無法連接行動網路的問題。如果還有其他疑問,歡迎隨時與我們聯繫,我們會竭盡全力為您提供幫助。感謝您的閱讀,祝您生活愉快,工作順利!
一、故障類型：電源無輸出 此類為最常見故障，主要表現為電源不工作。在主機確認電源線已連接好（有些有交流開關的電源要打到開狀態）的情況下，開機無反應，顯示器無顯示（顯示器指示燈閃爍）。無輸出故障又分為以下幾種： ①+5VSB無輸出 前面已講到+5VSB在主機電源一接交流電即應有正常5V輸出，並為主板啟動電路供電。因此，+5VSB無輸出，主機板啟動電路無法動作，將無法開機。此故障制定方法為：將電源從主機拆下，接好主機電源交流輸入線，用萬用電錶測量電源輸出到主機板的20芯插頭中的紫色線（+5VSB）的電壓，如無輸出電壓則說明+5VSB線路已損壞，需更換電源。對有些有待機指示燈的主機板，無萬用電表時，也可以用指示燈是否亮來判斷+5VSB是否有輸出。此種故障顯示電源內部有裝置損壞，保險很可能已熔斷。 ②+5VSB有輸出，但主電源無輸出 此種情況待機指示燈亮，但按下開機鍵後無反應，電源風扇不動。此現象顯示保險絲未熔斷，但主電源不工作。故障判定方法為：將電源從主機拆下，將20芯中綠線（PSON/OFF）對地短路或接一小電阻對地使其電壓在0.8V以下，此時，電源仍無輸出且風扇無轉動跡象此種情況除外則表示主電源已損壞，需更換電源供應器。 ③+5VSB有輸出，但主電源保護 此類情況也比較多，由於製造流程或裝置早期失效均會造成此現象。此現象和②的差別在於開機時風扇會抖動一下，即電源已有輸出，但因故障或外界因素而發生保護。為排除因電源負載（主機板等）損壞短路或其它因素，可將電源從主機中拆下，將20芯中綠線對地短路，如電源輸出正常，則可能為： I.電源負載損壞導致電源保護，更換損壞的電源負載； II.電源內部異常導致保護，需更換電源； III.電源和負載配合，相容性不好，導致在某種特定負載下保護，此種情況需做進一步分析。 ④電源正常，但主機板未給予開機訊號此種情況下也表現為電源無輸出，可透過萬用電錶測量20芯中綠色線對地電壓是否在主機開機後下降到0.8V以下，若未下降或未在0.8V以下，可能導致電源無法開機。 二、故障類型 電源有輸出，但主機不顯示。提示：這種情況比較複雜，判定起來也比較困難，但可以從以下幾個方面考慮： 1)電源的各路輸出中有一路或多路輸出電壓不正常，可用萬用表測試； 2)無P.G訊號，即測量20芯線中灰色線是否為高電平，如果為低電平，主機將一直處於重設狀態，無法啟動。 3)電源輸出上升沿或時序異常，或和主機板相容性不好，也可導致主機不顯示，但此種情況較複雜，需藉助儲存示波器才可分析。
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