After the firmware is installed, the computer does not see it. Solving problems with USB connection
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Just a few years ago, connecting a mobile phone to a computer was a whole problem: it required choosing the right cable, installing a support program from the mobile phone manufacturer, and understanding the complex hierarchy of menus. Now I remember all this as horrible dream, and even the greenest beginner can connect two devices. This became possible thanks to the development of this area in line with the requirements of the USB computer standard. Theoretically, for the system to “see” the internal storage media in the smartphone, you just need to connect the plug to the corresponding connector. However, even this approach did not completely solve the problem when the computer does not see the Android phone, which users continue to periodically encounter. Fortunately, such difficulties are often easily overcome, in just a couple of minutes. Today we will look at the reasons why the computer does not see the phone via USB, and also give recommendations for eliminating them.
Communication options
The owner of a smartphone has two ways to organize communication between the mobile device and the computer: via Bluetooth and Wi-Fi wireless networks, or using a regular USB cable. The first one is more modern, technologically advanced and flexible in configuration, but in terms of reliability it is inferior to the classic wired one. It is advisable to use a connection via radio waves only if it is impossible to connect with a cord.
Quality of conductors
Externally, the above-mentioned wire is a cable about 3 mm thick, on one side of which there is a standard computer plug of the universal serial bus, and on the other side there is a corresponding micro-USB plug that is inserted into the smartphone connector. One of the reasons why the computer does not see the phone memory is the use of a cable Low quality. Now the market is simply flooded with cheap products from little-known Chinese manufacturers, including USB cords. It is unknown whether such a product will work normally. The fact is that inside the cable there are several thin wires through which data is exchanged between connected devices. Copper conductors must be of a certain cross-section (thickness) and meet the requirements of the standard. Otherwise, you may well encounter problems such as internal breaks in the current-carrying wires or excessive resistance. And, what is important, by simple external examination quality cannot be determined.
Thus, using cheap cords, you should not ask the question of why the computer does not see the phone. Our advice is simple: if possible, you should connect the devices using the cable that came with your mobile phone. The exception is smartphones of initially low quality, in which the USB cord is extremely bad and requires replacement.
"Wrong" cable
A standard USB cord contains four wires for transmitting power and exchanging signals. However, some devices make do with only two. A striking example are common PowerBanks. The USB cable that comes with them contains only power wires, and there are simply no signal wires. It is impossible to tell the difference externally. If, when you connect the phone to the port, charging occurs, but you cannot turn on the internal storage, then the reason is the “wrong” cable.
Ohm's laws have not been repealed
It is known from a physics course that as the length of the conductor increases (assuming other characteristics remain constant), the resistance of the circuit increases proportionally. This leads to the fact that the voltage values at the source ( USB port system unit) and consumer (smartphone) varies. As long as the line length is short, this fact does not have any effect on the transmission of electrical signals. However, as it increases, significant losses begin to occur. And since the power of the universal bus controller is low (500 mA for standard 2.0, and 900 mA for version 3), resistance can have a huge impact on the data transfer process. Hence, trying to use extended patch cords results in the computer not seeing the phone via USB. Therefore, if the above problem occurs, we recommend replacing the cable with a shorter one.
Transition resistance
If the computer does not see the phone’s USB, and the quality of the cable meets the requirements, then the problem may be wear on the contacts of the plugs and/or connectors. Taking a close look at the inside of the USB plug (both the micro and standard sides), you can see a comb of copper sliding contacts. They are curved in such a way as to ensure reliable clamping to the contact pad strip inside the computer and phone connectors. But since no springs are used, over time the bending arc decreases and the contact is broken, provoking an increase in resistance at the point of contact (transition). If the computer does not see the phone’s USB, but when one of the plugs on the cord is touched, the operating system begins installing drivers, then the problem is in the contact. You can try to restore the bends with a needle, but it will be more reliable to simply replace the cable.
Selecting a port
Almost always, the owner of a smartphone connects his device to the computer via a connector on the front panel of the system unit. It's much more convenient than searching with reverse side The case has a free universal bus port, but in some cases it can lead to the computer not seeing the phone via USB. This failure is explained by the fact that all communication connectors on the front panel are connected to the motherboard via a cable of conductors, which, like the cable, have their own resistance. We recommend that if such problems occur, try using connectors on the back of the system unit for connections, rather than on the front panel. Even to the point of removing the cord of some other device during the test, freeing the port (if there are no free ones). When using a laptop, this problem is not relevant.
Device internal program
All modern phones support the ability to replace the control set and application programs- firmware. In many cases, this operation ultimately not only improves the performance of the smartphone, but also adds new or improved standard features. There are two types of firmware: from the manufacturer and custom, created by craftsmen. The latter, as a rule, enable the device to reveal its true potential, which is limited by developers for one reason or another. At the same time, a small mistake was made during the assembly of the software set - and the computer does not see the phone via USB. Moreover, even within the same model branch of smartphones, custom firmware can work fine for one user, but malfunction for another. The conclusion is simple: if problems started after flashing, then everything needs to be returned to a stable state.
Activate access
Although the developers of the popular Android system have done everything to simplify user interaction with it as much as possible, some still have questions about why the computer does not see the phone. A common problem is the simple ignorance of beginners necessary order further actions, which follow the connection between the smartphone cable and the system unit port. So, having connected the cord, you need to swipe your finger from top to bottom on the glowing touch screen of your mobile phone, which will lead to the appearance of a control window - the so-called curtain. If the connection is made correctly and there are no hardware problems, then the screen should show “Connected in charging mode.” When you click on this line, options for actions that the phone can perform open. To provide access to the flash drive and internal memory, you must check the “Enable storage device” checkbox.
If the computer does not see the Samsung phone
Samsung smartphone models use the storage device a little differently. In these models, after connecting the ports with a cable, you need to pull down the curtain and select “USB Connection” or disk mode. In some cases, you may need to first download the Samsung Kies program to your computer and install it. This application is completely free and posted on the company's website. The result of the installation is the registration in the operating system of the drivers necessary to support communication with the mobile phone. New models work without this program, although it adds new features.
If a problem occurs in which the computer does not see the Android phone, you should figure out what caused it.
We have collected all the ways to solve this problem.
The computer does not see via USB
If at one moment you find , that the computer does not see the Android phone via USB, you should remember what manipulations were carried out before the malfunction.
Maybe everything is not so complicated and you won’t have to take any drastic actions.
If you don't remember anything unusual, you should look into the problem.
First you need to check:
- is everything in order in the operation of the telephone itself;
- Is the computer functioning normally?
- Is the USB cable damaged?
If no faults are found, there is a problem with the operation of the program.
Check the cable for damage.
Is there no mechanical damage, do the connections look good? Maybe the cause is a clogged nest and after cleaning it, work will resume.
If such manipulations did not help, you should find a similar cord and use it to make sure that the problem has been found.
Restart your PC
If the computer for a long time without a reboot, everyone knows that the quality of its work decreases.
This means that the first thing to do if any problems are detected is to reboot the device.
It happens that USB on it does not work correctly over time.
At the same time, restart your mobile phone. If the question arises why the computer does not see the Android phone, pay attention to the mobile device as well.
Maybe it's malfunctioning. Just for ten minutes, disconnect the battery from the smartphone itself and turn it on again. This can help.
Broken connector on mobile
If this does not solve the problem, you need to look further. Check the connector in the mobile device itself. Remove dirt and dust from there.
Wipe gently with alcohol or cologne. Check with another cord or flash drive or modem, a device that is definitely working.
Drivers
Maybe the PC simply does not have the necessary drivers that ensure its connection to the phone.
This often occurs when connecting a new mobile device. In this case, the computer will not see the smartphone at all, or will display a system error message.
To check, you need to go to "Device Manager" which is in the menu "Start". Also, it has an icon on the toolbar.
If the icon is missing or there is a yellow Exclamation point– the drivers have problems.
This means you need to download the file from the Internet, install it and, after rebooting, try connecting the devices to each other again.
There is an option that drivers are present, but they old version. Then you should do the following:
1 You need to go to "Device Manager" and find the tab in it "Usb controllers".
All existing controllers are located here.
Among other things, you need to find the name of your mobile phone. It is often signed in the same way as the modification of the device itself or the name operating system.
2 Now you need to understand whether the device is active. Right-click on the icon and in the window that opens, find the item "Properties".
4 Now you can update drivers, in an automatic way, or manually.
5 If the update will be carried out independently, it is necessary that the file with the program be recorded on the same computer.
6 When auto-updating, an Internet connection is sufficient. It happens through "Task Manager". You need to right-click on the name of the smartphone and go to the item "Updates", in the window that opens.
7 After specifying the method by which the actions will be performed, the problem will be resolved.
It is advisable to select automatic change of parameters, then you will not be required to take any further action. There is less risk of doing something wrong.
Viruses
Another possible reason that the computer does not see files on the Android phone may be the presence of viruses on the PC.
Wouldn't hurt to install antivirus program and run the scan. Clean your device of unnecessary debris and reboot.
Then try pairing with your mobile phone.
If all the manipulations carried out do not produce results, contact your smartphone service center. You will probably need professional help.
Device Compatibility
There are also cases when everything seems to be installed and everything is working correctly, but the PC cannot detect the phone.
This malfunction occurs due to interruptions in the computer processor.
The solution to this problem is very simple. You need to restart both devices. Close unnecessary processes and delete cache on your phone.
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- Viruses that are not on your desktop computer, but on your phone. This is a common thing, but if they are present, the computer will not see the smartphone. You should know that there are several types of virus programs that can be caught on your phone. To determine which one you have, install a special program and run a scan. Based on its outcome, delete the malicious file. Reboot the device and check the connection again.
If the connection is successful, it is worth running a virus scan again, but using the antivirus that is installed on the computer.
It will scan much more thoroughly and, accordingly, help identify more garbage.
- Phone memory is full. With this option, difficulties will certainly arise when connecting to a PC. Clean your phone and restart it. You can also change the memory card or format the existing one.
Be sure to disconnect it from the PC, carry out the necessary actions, and then reconnect it. If this was the problem, it will be solved.
- You need to turn off modem mode. Not all, but some of the modifications of smartphones require you to deactivate the modem mode before working with a PC.
It is possible to perform such actions using configurations that are responsible for converting a computer and a phone.
- Storage mode deactivated. When connecting to a computer via USB, in the window that opens on Android, you should enable the configuration that is responsible for operating the phone in removable disk mode. With this option, the PC detects your phone, but does not display information on the screen. To solve the problem, you need to go to the toolbar on your mobile phone. Open the tab responsible for pairing with third-party devices, then the item "Using USB" and activate the section responsible for file transfer. After some short time, a window will pop up on the PC with the folders located on the smartphone.
Does your computer not see your Android phone or tablet via USB? This is a fairly common problem, but it can be fixed on your own. In this article you will find useful recommendations how to do it.
In addition to the solutions given below, there are several more that we have already talked about on our website! If your phone does not connect to your computer via USB, try via Wi-Fi: , .
Also pay attention to applications for transferring files over the Internet: and. In general there is worthy alternatives connecting via USB (unless, of course, you are interested in other options like ).
As for the problem with connecting mobile devices via USB to a computer, there are only two types:
- The phone is not recognized by the computer, but is charged from it;
- The PC (or laptop) does not completely recognize the smartphone.
We will consider both options in detail and try to help you fix everything!
The computer does not see the Android phone via USB. What to do?
1. First, use a different USB cable. If there is no effect, the problem is not there.
2. Check the functionality of the USB port: to do this, connect the mobile device to another connector. If the PC still does not see Android, the problem lies somewhere else.
3. Try connecting your phone to another computer. If you fail here too, there may be a problem with the microUSB or other components of the smartphone. In this case, only repairs will help you.
4. If you connect an Android smartphone to a laptop or PC running Windows control XP and the computer does not recognize the phone, you need to install the MTP (Media Transfer Protocol) protocol for Windows XP. You can download it from the official Microsoft website: http://www.microsoft.com/en-US/download/details.aspx?id=19153
5. Now regarding devices protected by a pattern or password. For your computer to see your files and folders, you must first unlock your phone or tablet. Tested on Nexus 7 2013 with Android 5.1.1.
If the downloaded drivers come immediately with the installer (. exe file), then you just need to run its installation. Also, drivers will be installed when you download and run programs. various manufacturers to synchronize devices with a PC (HTC Sync, Samsung Kies, etc.).
7. Enable USB debugging. May I help.
8. Try to completely remove the old driver, then restart the computer and reinstall the driver as described in step 6.
9. Make sure that your smartphone or tablet is not connected to the computer in “Charge Only” mode.
10. Also make sure that the “USB modem” item is not activated. In this case, the phone will not be visible to the PC. You can disable it in “Settings” → “ Wireless network» → “More” → “Modem mode”.
11. When Android connection to the computer you can select the connection mode. As you can see, I only have 2 available (Nexus 7 2013 with Android 5.1.1). But on other devices, versions of Android, firmware, there are other modes like “USB Mass Storage”.
You can also select the connection mode from the notification panel.
12. Restart your phone and computer (yes, it happens that this helps too).
13. If everything was fine before, but now for some reason the computer does not recognize the device, you can reset the settings on it. How to do this is written in detail in, but keep in mind that all your applications, accounts, contacts and other data from the internal memory will be deleted, so do it first.
14. You can also flash your device without using a computer. For example, using ROM Manager (), you really need .
Modern Cell phones according to their capabilities, they combine a media player, telephone, organizer, flash drive, navigator and a lot of others useful devices. Of course, users constantly communicate between their mobile device and their computer, moving a ton of information in both directions.
Music, movies, photos, applications - all this is simply necessary to modern man on his phone. Without communication with a PC, the mobile phone will sharply lose its functionality. Close interaction is ensured through a connection via a USB cable or via Bluetooth. Since file transfer via Bluetooth is quite slow, the USB connection is the most common.
Now imagine the bewilderment and even anger of the user if, when connecting the phone to personal computer Nothing happens. The operating system stubbornly refuses to see the mobile device, assuming there is no proper connection. In this article we will try to find out the reasons for this phenomenon and answer the common question: “Why doesn’t the computer see the phone?” We will consider two options: when the computer does not respond to the mobile connection at all, and also if the phone is detected as an unknown device. So, now in more detail.
How to detect a problem
When you connect to the computer, your phone is not detected in any way, nothing lights up on it, and there is no message on the monitor about connecting the device. This is a fairly common malfunction, with several causes. Let's try to list them and give recommendations for eliminating this problem. This assumes that the USB port you are connecting to is working. That is, other devices work normally through it.
1. If the phone used to connect normally, and then suddenly it didn’t want to, then you should, first of all, suspect the quality of its connection to the computer. Try removing the connection cable from both the mobile and the USB input and then reconnecting them. It often happens that the contacts of the telephone connector simply become loose or dirty. This problem is inherent to a greater extent in the brand. Sony Ericsson, whose models stand out on the market mobile communications a completely illiterate and often faulty connector.
Tip: if possible, try to clean the telephone connector with an eraser, after which remove any remaining rubber from the surface of the contacts.
If cleaning does not help, then connect the phone through another USB cable. Take it from friends or relatives. Cable failure is not the most common cause of trouble, but this option also needs to be taken into account. If it helps, then you just need to buy a new accessory.
2. Restart your computer. Oddly enough, this method helps in most cases without any problems. additional measures. During the reboot process, system settings are reset and redefined USB ports. By the way, when the computer does not see the tablet, the best way to help is to restart the computer, as is the case with the phone.
3. Rebooting your PC didn't help? Then, to be safe, restart your mobile phone. Unplug it, remove the battery for 10 minutes, and then put it back in. Turn on the device. Nothing happens? Go ahead.
4. Unplug the cable from one USB and connect it to another USB input . This simple action often helps, since the computer sometimes confuses the ports. To ensure that the OS sees the connection, you can use the following method. Go to "Device Manager" and find a list of used ports there. Typically this information includes all USB bus controllers. Open the list. In it you can see all the working ports of the computer. Find in this list the port to which the phone is connected in this moment(this can be seen in the “Nutrition” column). All other ports, except the one found, can be temporarily disabled. The computer will have no choice but to see your mobile.
There is, of course, the possibility of a breakdown of the phone itself or its connector. This is the most difficult option, in which you cannot do without contacting a service center. There they will be able to tell you exactly why the computer does not see the phone and how to fix it.
USB device not recognized
We go further, considering the second case, in which the computer identifies the phone as an unidentified device. Of course, the OS does not want to work with an unknown device. And the question is not that Windows itself is imperfect, because the same problems often arise with Linux and other operating systems. Therefore, we must help the computer identify our mobile phone. Let us list the reasons for this phenomenon and possible actions user:
The problem may be with the phone itself. Connect the device to another computer. If the problem persists, then the reason lies inside the mobile device. You may need to enable one of the computer connection modes in the settings. For example, the “Data transfer” or “Storage” mode. Experiment with these modes;
Tip: Check your phone settings. In some mobile models, you must manually enable synchronization mode, which is disabled by default. Or disable the current blocking. If there is a blocking, open access must be established.
a) restart your PC and phone as described in section 1;
b) often the mobile phone is not recognized by the OS in case of lack of power supply. If you connect the phone to the front computer panel, then try connecting it directly to the motherboard, into the USB slot located on the back of the system unit;
Tip: In the Device Manager section, find the port you are using and open the Power Options tab. Check to see if the “Allow device to turn off to save power” checkbox is unchecked. If the checkbox is checked, remove it.
Sometimes glitches occur in the OS, as a result of which the “native” drivers of some devices are lost. Reinstalling the drivers for the motherboard and for connected devices. If your phone came with a driver disk, use it to connect the device;
Tip: You can check whether your device needs drivers in Device Manager. If there is a yellow question mark before the device name, you can conclude that there are no drivers for this plug-in. How can you determine that an unidentified device is a mobile phone? Very simple. Disconnect it from your computer and the question mark will disappear.
We also cannot exclude the possibility of the OS being infected by a virus that sets its own rules on the computer. Check all drives (including the system drive) with a good antivirus with up-to-date databases.
If none of the above helped you, and there is still no connection between your mobile phone and your computer, then you can use a radical treatment. If the phone is detected perfectly on another PC, then the cause of the problem most likely lies in the operating system. You'll have to reinstall the system. Then everything will surely work. Moreover, such errors in the system accumulate gradually, it is impossible not to notice. Thus, reinstalling the software will not only solve the issue of connecting the phone, but will also eliminate other possible errors.
One of the main reasons why the computer may not see the phone via USB is a problem with the corresponding port on the computer or laptop. Often, due to various problems within the operating system, the connection ports external devices refuse to work at one time or another. Before attempting to eliminate this, it is important to rule out other possible reasons breakdowns.
Sometimes the situation is the opposite: the problem comes from the USB cable connector on the phone. This is often the case with cheap devices, as well as phones that are handled carelessly. In some cases, it also happens that problems with a mobile device cause a system crash on the computer, which completely eliminates any possibility of identifying the phone.
Further, you should not exclude the possibility of a broken USB cable, which may simply become unusable over time. In addition, if the computer does not recognize the device being connected, it may be necessary to install special drivers and programs, without which the connection will not occur. These are all the main reasons why the ability to exchange data between two gadgets is lost.
What to do if the computer does not see the phone via USB
Having found out why the computer does not see the phone via USB, you should begin to solve the problem. In the first of the previously described situations, disconnect the cable from the connector on the computer. Restart your computer and try connecting the device again. Please note that there are usually several USB connectors, so you should try to check that all of them are working. Also check for any accumulation of dust and dirt in the connectors, which could affect the quality of the connection. They need to be periodically cleaned and purged.
If you hear a corresponding signal when you connect the USB cable to the computer, but nothing happens after that, it is likely that the second of the following is occurring here. possible situations. Unplug your phone and restart it (turn it off and on again). Additionally, you can restart the computer itself. Reconnect and check if the problem is now resolved. Please note that when connecting your phone for the first time, you will need to wait a few minutes as necessary system services may be installed and configured.
If the computer still does not see the phone via USB, carefully study the included mobile device instructions or read it on the Internet. You may need to download special programs and drivers from the manufacturer’s website or CD from the kit. For example, to exchange data with iPhone devices and iPad requires iTunes application, etc. To download the necessary services via the Internet, open the “Device Manager” on your computer from the control panel, click on unknown device with a yellow icon and search for drivers.
If, after all of the above, the computer does not begin to detect the phone, the USB cable is most likely damaged. Try replacing it with a new one or just show your phone to specialists from your local service department to get the most appropriate recommendations for your case and repair the device.