Why doesn't the touchscreen work after updating my smartphone? The touchscreen (sensor) on an Android phone or tablet does not work well. The touchscreen (sensor) works on its own, it works some time after pressing, it’s dull, it lags, it doesn’t work correctly

It is running Android. The touchscreen (sensor) works on its own, it works some time after pressing, it is dull, lags, and does not work correctly. What to do and how to fix it?

Many users encounter a problem when phone or The Android tablet starts acting up. It seems that it didn’t fall anywhere and wasn’t “watered” with anything, but it doesn’t work as it should.

For example, the device has problems with a touchscreen, i.e. touch input (“sensor”) does not work correctly. The reason for this may be:

1st: Software glitch- i.e. the problem is a software glitch

2nd: Hardware failure- i.e. the problem is in the hardware (i.e., replacement or restoration of spare parts for the gadget is required)

However, do not rush to get upset - in 90% of cases there are problems in the operation of touch input (touchscreen) smartphone or Android tablet is to blame software glitch which you can easily fix on your own.

Fixing a software glitch:

Method 1. Quite simple - go to "settings", find there "backup and reset", in which you choose full reset settings with deletion of all data. Be careful, using this method is often effective, but it entails deleting all photos, contacts, passwords, music, games, videos and, in general, all information stored on your smartphone e or tablet e. Therefore, first save everything you need by connecting the gadget to your computer. If this method does not suit you, or if after this the problem is not resolved, see Method 2.

Method 2.

Based on solving touchscreen problems phone number and tablets based on Android by introducing additional software. Utilities that control all processes inside gadgets. Today, there are quite a lot of them, however, the fewer functions an application contains, the more effective it is, as a rule. The best way to monitor system functions, corrects, and correct all possible settings and synchronization errors is a small, easy-to-use, free utility for Android-based devices. You can download the application from Google Play and see its additional options in the description. After installing the application, all that remains is to launch it. Further, in principle, nothing more is required from you. The application will take full control of the device's functions. (By the way, among other things, the gadget will begin to charge 20% faster, and its performance will also increase significantly, which will affect the loading speed and operation of all applications, games, and the system as a whole. On average, after scanning, the system runs at 50% faster.)

Method 3.

Changing the device software, or as it is also called "re firmware ". This method, as a rule, requires certain skills and can be solved by contacting the Service Center. To carry out this task yourself, you need to contact the website of the manufacturer of your device, download the utilities necessary for flashing the firmware and the firmware itself, and then reinstall it on your gadget.

If none of the methods brings results, unfortunately, you will have to contact the Service Center for repairing your tablet a or smartphone a.

The touchscreen (sensor) on an Android phone or tablet does not work well. The touchscreen (sensor) works on its own, it works some time after pressing, it is dull, lags, and does not work correctly. What to do and how to fix it?

Touchscreen not working? What to do?

What to do if you just replaced the screen, but it completely stopped working and responded to touch?

This is one of the most unpleasant problems, because the touchscreen is the main and only option for functioning and working with the device.

In this article we will look at the causes of this problem, ways to solve and prevent it.

If after replacement the touchscreen stops working, then you need to understand what could have caused this problem.

Causes of malfunctions

• Accumulation of debris inside the device;
• Problems with connectors;
• Crooked display;
• The screen is damaged during replacement;
• Damage or break in the cable.

Ways to solve the problem

The problem is serious, but like any other, it has a solution. These issues may occur if your device has an LCD screen.

• Try rebooting your gadget. Most often this is the method that works.

• If rebooting does not solve the problem, perform a hard reset of the device. In this case, your personal data will not be lost. How to do it? Each device has its own special combinations that are different from others. Therefore, you need to look at the instructions for your gadget or search for it on the Internet.

• If the touchscreen doesn’t work the first time, this is not a reason to panic. After all, the whole issue may be due to incorrect installation of the sensor, if the technician made a mistake in contacting the sensor with the screen.

Here the device needs to be opened to check this. First of all, remove the protective cover of the screen, because the reason may lie there.

Advice:

do not rush to remove the cover and disassemble the device if you have not yet fully verified the functionality of the screen without internal intervention.

Checking the loop

If it is not connected tightly to the display, then it needs to be reconnected and checked for functionality.

It is also necessary to check the connection with the contacts, whether they are inserted completely.

If they suddenly become oxidized, you need to carefully clean them with an eraser.

But if there is any visual damage there, it needs to be replaced.

If the contacts are not connected properly, there may be incorrect clicks or the screen may not work at all. You should disassemble the device, insert the cable well and put it back together.

If the contacts are pressed through by other contacts, for example, from a connector, then the cable must be inserted all the way and pulled out one tenth of a millimeter so that the cable rests on the new contact points of the pad.

It so happens that the controller soldered on the cable turns out to be incompatible with your version. This often happens with gadgets from China.

Then you need to unsolder the controller from your old display and solder it into the new screen.

If you cannot do this yourself, due to lack of experience, take it to the masters who understand this.

• There is a protective film on the display. If it is of poor quality, it will affect the performance of the screen, reducing sensitivity to touch. Therefore, remove it and wipe the screen with a special cloth.
• Requires calibration. Try turning on your device without using the sensor so that the controller can rewrite the data about the new screen. During the download, its firmware will be updated and after the update the system will start.

This procedure is called screen calibration. It is used for strong and weak screen sensitivity, as well as for complete absence of sensitivity.

Basically, calibration is performed using special applications.

« Touchscreen doesn't work“This is one of the most common problems faced by the user of a modern smartphone, phone or tablet.
In such a situation, the simplest and most correct solution would be to contact a service center, where qualified specialists will help you.
If you decide to do the repairs yourself, then our advice will definitely be useful to you.

Before you buy a new touchscreen, find out the model of your gadget and the touchscreen label. It is worth paying attention to the size and location of the proximity sensors, front camera and speaker holes. This is especially true for devices that are manufactured in China. For more detailed information on how to choose the right sensor for a Chinese gadget, read our article

Removing the touch screen

Before ordering a screen, we advise you to figure out whether you can technically make the replacement yourself. Quite often, special equipment is required to peel off a touch screen. When disassembling your tablet or phone, remember the entire disassembly sequence, the location of the screws, plugs and latches. You can order the most necessary tools for disassembling the gadget.

Be extremely careful when disassembling the device, as you may accidentally damage internal elements that are located close to the edges, for example, cables, power buttons, side buttons, antenna, etc.

Having disassembled the device, remove the touch screen. An important role is played by how the touchscreen is attached to the matrix: monolith or separately.

There are modular (non-demountable) models and those with which we still have to tinker. The sensor itself can be connected to a printed circuit board bus (wires) or contact method. If screen connected by bus, then be extremely careful not to damage it when dismantling.

Everything is much simpler with contact method(simple contact of contacts). Here the sensor is simply removed.

If you come across a device where you need to detach the glass or display from the sensor, and they are glued together over the entire area photopolymer glue, then we recommend using a special separator for unsticking such assemblies.

Be sure to watch the video how to use a separator correctly for peeling off glass from the display module.

To work with the separator you will also need:

To reassemble such a module, you will need special glue.
Our video will help you choose the right glue specifically for your device.

To carefully and securely glue the glass, use a retaining form and an ultraviolet lamp.

If you are lucky and the touch screen was removed along with the front panel, but without the display, then this means that it was glued with double-sided tape.

You can peel off such adhesive tape mechanically using a thin, flat object. If the glue has a stronger hold, you will have to preheat the glued surface using a hot air soldering station. Warm up very carefully so as not to damage the plastic frame.

How to choose a touch screen?

Did you manage to disassemble the gadget? Congratulations!

Proceed to selecting the required part. As we have already written, important factors when choosing a spare part are the version and markings of the touch screen.
It is also important to determine the thickness of the double-sided tape. If the layer is too thick, the sensor will stick out strongly from the rim. Conversely, if the tape is too thin, then there is a high probability that after assembly the sensor will stick, not work, work spontaneously, or not work at all. Note! In many models You should absolutely not allow the sensor to directly touch the display or metal frame!

If the touch screen does not work the first time, this does not mean that it is broken or defective! The most common mistake lies in sensor substitution. Do not allow the sensor to come into contact with the display under any circumstances! It is also worth checking the sensor contacts to see if they are fully inserted. It may be necessary to clean the contacts on the cable and on the connector into which the touch screen is connected with an eraser, as they may oxidize.

After checking that the connection is correct, start working on software compatibility of your gadget with the new touch screen.
You need to force the touch controller to overwrite the new touchscreen data. To do this, you need to turn on the tablet without connecting the sensor. During boot, the system will reset the controller firmware. After the update, the OS will load. The next sequence of actions is as follows:
without turning off the tablet, remove the battery → connect the sensor → turn on the tablet → the sensor firmware is updated.

This procedure is called touch screen calibration. It is also used in case of incorrect operation of the sensor, inverse operation, sticking (oversensitivity) or, conversely, poor sensitivity of the sensor. It happens that calibration has to be done using special programs that can be found on the Internet.

In some cases it is required complete flashing of the gadget. The software must either be updated to the latest version, or, conversely, rolled back to the previous one. In such a situation, you should contact a specialist or experiment with different firmware.

Sometimes you don’t need to reflash at all, but just do it HARD RESET. For each model, this procedure is done differently; information about such procedures is publicly available on the Internet.

Note! All software adjustment procedures may result in the loss of personal information. If you decide to manipulate the OS, take care in advance to save your notebook, photos, videos and other information that is important to you.

If the touch screen is not working, you can save information using a computer mouse or keyboard connected via a special OTG cable.

Situations also arise when it is necessary to carry out not one, but several of the above procedures, for example, first reflash, and then calibrate.

If you have already tried all possible calibration methods, The old sensor is broken, but it works, but nothing works with the new one, that is, another way to get the new touchscreen to work.

It happens that the controller, which is soldered directly onto the screen cable, is simply incompatible with the version of your device (this is especially true for tablets from China). In this case, you need to unsolder the appropriate controller from the old sensor and solder it into the new touchscreen. This procedure can only be carried out having some experience. If you are counting on a possible return of a part, first coordinate your actions with the manager who served you! Inaccurate soldering will void the warranty for this touch screen.

Has the sensor worked? Perfect!

However, don't rush. Remove the inner protective film from the touch screen and assemble the gadget possible only after a full check of the touchscreen functionality.

If you still fail to achieve the desired result, you can return the touch screen (subject to warranty requirements). Read more detailed information about the procedure for returning goods on the page

ALL SPARE PARTS wants your touch screens to always remain unharmed, and if something goes wrong, we will try to provide you with all the necessary spare parts. Good luck with choosing and replacing a touchscreen!