Why does the keyboard not work on a Samsung phone. Mobile phone keyboard does not work or does not work completely

Why don't the buttons on Samsung phone? The answer to this question will be interesting to many, because mobile owners often face a similar problem. The wizards of our service center will help you restore your phone to work.

for several reasons. Let's consider the possible options:

1.Samsung buttons stopped working, if the backing of the buttons is faulty. This happens most often when liquid enters the middle of the device. As a result, the buttons oxidize and do not respond to pressing. In order for the device to work again, it is necessary to replace this component with a new one;

2... no buttons are pressed on Samsung, if the keyboard control chip is faulty. It breaks down from moisture or shock. In order to keys work again, it is necessary to replace the microcircuit with a new one;

3.in most cases repair of the button and the entire keyboard on Samsung produced if moisture gets into the device. In this case, you must immediately dry and clean the mobile. If you don't, there is nothing strange if the buttons stop working on Samsung. You should not delay the repair, even if the cell phone started working again after a while, since the oxidation process takes a long time and you cannot be sure that at the most inopportune moment the device will not let you down. The more time elapses from the moment of liquid ingress, the more difficult it is to restore the full functionality of the phone.

The buttons are not pressed well on Samsung also after a fall or strong blow. In this case, you may even need to completely solder the cell. In order to resume its work, it is best to contact our service center, where they will diagnose and determine the cause of the breakdown.

Most often, we are contacted with a problem when the Samsung power button is broken. Naturally, it fails most often as a result of mechanical damage. If it fails, it becomes impossible to turn on the phone. We have Replacing the Samsung power button (power) carried out quickly and efficiently. It is not at all worth it to repair your cell phone yourself, because, having disassembled the phone, an inexperienced person does not focus on how to fold it correctly. As a result, other parts fail, which complicates the repair process.

Samsung keys do not work and what should I do?

If, due to circumstances, you are faced with a problem - it does not function keyboard or at least one of its components, such as Samsung sound volume button does not work, come to our service center immediately. Replacing buttons with Samsung for us it is a simple task.

Only here:

Diagnostics Samsung conducted completely free of charge. In most cases, this happens in the presence of the client;

The warranty is issued in full for the entire device for any repair, and not just for the replaced part;

After repair, the device undergoes Free quality control;

Repair discounts;

Only original spare parts. We are suppliers of spare parts for the whole of Russia and because of this, the prices for repairs are cheaper;

After the first repair, you will be issued a vip client card for a discount from 10% to 40%.

The girl dropped Samsung on the asphalt, after which the power key stopped responding to pressing. Samsung Button Repair she decided to entrust our specialists. Within 20 minutes, we made a diagnosis and identified the cause. Samsung Button Replacement the new one took only a few minutes. After all, the girl received a guarantee for the entire device.

Keyboard malfunctions can be caused by several reasons:

The presence of oxides on the surface of the contact pads of buttons and metal membranes. There is either a short-circuiting of the oxidized buttons (as a result of which the entire keyboard does not work), or isolation between the contact pads and the pressing (closing) membrane (the corresponding buttons do not work). This defect is eliminated by peeling off the film holding the metal membranes and cleaning the contact pads of the buttons and membranes from oxides. As a rule, the keyboard starts working properly;
- the EMIF filter is faulty (if provided by the telephone circuit). It is checked by dialing a multimeter according to the electrical circuit diagram. Damage to the EMIF filter occurs mainly when exposed to moisture. The oxides accumulated under it (and this is a BGA package) short-circuit the filter leads and thus the bus of the keyboard module. As a result, all or part of the keyboard does not work. Otherwise, the filter leads are destroyed and the keyboard bus circuit is open. It is eliminated by replacing the EMIF filter with a new one; in this case, after dismantling the faulty filter, it is necessary to carefully remove the residues of oxides and examine the contact pads for damage. After replacing the filter, the keyboard starts working properly;
- the loop of the keyboard module is damaged (if it is designed as a removable module). It happens when the phone casing is severely damaged as a result of falls or when the phone is disassembled ineptly / incorrectly. Eliminated only by replacing the keyboard module. It is allowed to restore damaged loop conductors by soldering with a thin wire. This repair is carried out for reasons of expediency and physical possibility of this type of repair, as well as under the condition of normal further operation of the loop restored by this method.
- failure of protective varistors and / or zener diode assemblies, which are installed parallel to the keyboard buses relative to the ground (housing, GND). Installed in most phones, especially the Samsung brand. The presence and location is specified according to the electrical schematic diagram. Basically, the closure of these elements occurs as a result of exposure to moisture. In most cases, these elements are simply removed and the keyboard starts working properly, but it is advisable to replace them with new ones.
- closing the side buttons (volume control, camera shutter, etc.). Often, when moisture gets into the phone, the stuck buttons begin to short-circuit. If the buttons are made in the form of a remote loop, then it is convenient to carry out diagnostics by temporary soldering and subsequent testing of the keyboard's performance. If the buttons are each made in a separate case and soldered to the board, then, if possible, it is necessary to unsolder one of the working (not case!) Terminals and check the operation of the keyboard. If the result is positive, the faulty button is replaced with a new one. If the keyboard still does not work, the button circuit is restored and similar diagnostics are performed with the following buttons.

If the phone itself turns on when the battery is inserted and / or turns on and off cyclically - the reason is the closing of the power button or the varistor in its circuit. Oxides in the connectors of the keyboard module or board-to-board loop (for folding / sliding phones) can also short circuit.

Keyboard malfunctions can be caused by several reasons:

The presence of oxides on the surface of the contact pads of buttons and metal membranes. There is either a short-circuiting of the oxidized buttons (as a result of which the entire keyboard does not work), or isolation between the contact pads and the pressing (closing) membrane (the corresponding buttons do not work). This defect is eliminated by peeling off the film holding the metal membranes and cleaning the contact pads of the buttons and membranes from oxides. As a rule, the keyboard starts working properly;
- the EMIF filter is faulty (if provided by the telephone circuit). It is checked by dialing a multimeter according to the electrical circuit diagram. Damage to the EMIF filter occurs mainly when exposed to moisture. The oxides accumulated under it (and this is a BGA package) short-circuit the filter leads and thus the bus of the keyboard module. As a result, all or part of the keyboard does not work. Otherwise, the filter leads are destroyed and the keyboard bus circuit is open. It is eliminated by replacing the EMIF filter with a new one; in this case, after dismantling the faulty filter, it is necessary to carefully remove the residues of oxides and examine the contact pads for damage. After replacing the filter, the keyboard starts working properly;
- the loop of the keyboard module is damaged (if it is designed as a removable module). It happens when the phone casing is severely damaged as a result of falls or when the phone is disassembled ineptly / incorrectly. Eliminated only by replacing the keyboard module. It is allowed to restore damaged loop conductors by soldering with a thin wire. This repair is carried out for reasons of expediency and physical possibility of this type of repair, as well as under the condition of normal further operation of the loop restored by this method.
- failure of protective varistors and / or zener diode assemblies, which are installed parallel to the keyboard buses relative to the ground (housing, GND). Installed in most phones, especially the Samsung brand. The presence and location is specified according to the electrical schematic diagram. Basically, the closure of these elements occurs as a result of exposure to moisture. In most cases, these elements are simply removed and the keyboard starts working properly, but it is advisable to replace them with new ones.
- closing the side buttons (volume control, camera shutter, etc.). Often, when moisture gets into the phone, the stuck buttons begin to short-circuit. If the buttons are made in the form of a remote loop, then it is convenient to carry out diagnostics by temporary soldering and subsequent testing of the keyboard's performance. If the buttons are each made in a separate case and soldered to the board, then, if possible, it is necessary to unsolder one of the working (not case!) Terminals and check the operation of the keyboard. If the result is positive, the faulty button is replaced with a new one. If the keyboard still does not work, the button circuit is restored and similar diagnostics are performed with the following buttons.

If the phone itself turns on when the battery is inserted and / or turns on and off cyclically - the reason is the closing of the power button or the varistor in its circuit. Oxides in the connectors of the keyboard module or board-to-board loop (for folding / sliding phones) can also short circuit.