Cellular telephone, Samsung tablet(samsung) fell into water or what to do if water gets into the phone, tablet

Recessed phone, Samsung tablet. What to do if you drowned or just got wet.

Water can't do harm phone, tablet . You tell me, what am I doing on your website in this section? I’m broken. Because it is not water that removes from standing, but water in combination with a battery. As a result, electrochemical corrosion of the board occurs. In other words, the board of your gadget and all its elements begin to rust, rot, i.e. decay, turns into dust.

Why are the manufacturers of cell phones and Samsung tablets not protecting them from corrosion?

Why did you decide that? Protect and how. They cover the board with a protective layer of varnish to protect your machine.

And why then fail if its board is covered with a protective layer of varnish? Because this varnish should not save you from swimming in the pool. Only a diver's spacesuit will save you from this. Its task is to create a protective barrier and prevent the formation of corrosion on the board if there is suddenly a strong humidity. For example, a bathroom or a bath. And again, this barrier is not long in time, which means that you should not test it for strength while sitting in a steam room with friends.

The first thing to do if water gets into your phone or tablet is to disconnect the battery. Then immediately carry it to service center... If this is not possible, then you need to try to somehow dry the device with a hairdryer, put it on the battery overnight, put it in a warm place for a couple of days, etc. Perhaps after that your darling will work without problems. Although, as practice shows, the lion's share of phones, tablets coming in for repairs were previously exposed to water (this is indicated by rusty spots inside, oxidation, deposits, etc.) and who knows for what reason your gadget came out this time building. In any case, it can be argued that it was the water that once got there that played an important role.
In all cases of moisture penetration under the case, it is necessary to dry and clean the device. Otherwise, partial or complete inoperability of the device may occur. Let me emphasize that it is possible, not required. But the oxidation process can take a long time, and it is impossible to say how a mobile phone or tablet will behave the next day or in a month. The more time has passed since moisture ingress, the less likely it is to restore full performance in case of a breakdown.
If, after getting wet, you quickly disconnected the battery and brought it to us, then most likely you will save your pet and save your budget for repairs.

What do we do when your phone is on the mock?

Disassembly of the phone;
- cleaning in an ultrasonic bath;
- removal of traces of moisture;
- cleaning the mobile phone board from corrosion;
- complete drying of the apparatus;
- phone testing.

In all cases, in case of a malfunction of a mobile phone, it is still better to contact the Service Center, where specialists can help you.

Consider the main breakdowns mobile phones, ways checks and their solutions:

Your mobile phone does not pick up the network

At the very beginning, you need to pay attention to whether the phone shows any level of reception on the display. If it does, then it is possible that the network you have chosen does not support your operator. To do this, go to the "SETTINGS" menu and select the "AUTOMATIC" network search mode. If this did not give the expected result, try to select your network manually, in the same menu.

One of the reasons may be in your SIM card:

• Check if it has expired;
• If your account has run out of money;
• Is the SIM card out of order?

The most acceptable option to check this is to insert another card into your phone. It is best to use a card of the same operator as yours.

If all of the above does not help, then the problems are hidden in the phone itself. There are many of them: from failure software before the failure of the electronic components of the phone. In this case, you need to contact our "Mobile Jungle" service center.

No SMS sent from a mobile phone

The most common reason for this is that the number of the Short Message Center (SMS Center) is incorrectly specified, or it is completely absent. Short messages (SMS) are sent directly to this number, and the operator cellular communication further redirects your messages to the recipient's number. Each mobile operator has its own SMS center number. Check with your mobile operator for this number.

The number of the Short Message Center (SMS Center) is entered in the submenu of the cell phone SETTINGS, in the menu MESSAGES.

The next reason may also be that short messages (SMS) can be blocked by the mobile operator due to non-payment or other reason.

V cellular telephone water has been spilled or the phone has fallen into water

Very often it is the ingress of water that causes a number of serious breakdowns of your mobile phone. The very first thing it is recommended to do is to quickly disconnect the battery from the phone. Otherwise, the process of oxidation of contacts (electrolysis) occurs. Then try to somehow dry the device by placing it in a warm place for a couple of days. Perhaps after that the phone will work without problems. Although, as statistics show, most of the phones coming in for repair were previously exposed to water (this can be seen from rusty spots inside, oxidation, bloom, etc.), and who knows for what reason the phone went out of order this time. In any case, we can say with confidence that the water that once got into the phone played an important role.

In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise, it is quite possible that your phone may be partially or completely inoperable. After all, the oxidation process can take quite a long time, and it is very difficult to say how the phone will behave the next day or in a month. And the more time has passed from the moment of moisture ingress to delivery to the Service Center, the less likely it is that the phone will be fully operational in the event of a breakdown.

Doesn't show cell phone display or stripes on screen

One of the reasons may be a defect in the display itself. Then it will need to be replaced.

If you have a clamshell or slider phone, then the reason may be a board-to-board cable. It is a flexible piece with conductors that connects one part of the phone to another. One or more of these conductors may be damaged. To restore functionality, you will need to replace the board-to-board loop.

We can also talk about a defect that arose as a result of moisture getting inside the phone or mechanical damage. In this case, careful diagnostics, cleaning, and possibly more serious repairs, up to the replacement of a part, are required.

Mobile phone keyboard does not work or does not work completely

More often than not, the keyboard does not work after getting wet. And as a result, it is required to clean it from oxidation, if, of course, it arose only under the keyboard.

It can also be the result of a fall or blow. In this case, a complete soldering of the phone is required. To do this, contact our "Mobile Jungle" service center.

The processor is fully responsible for the keyboard. So the keyboard may not work due to its failure.

The bell rattles in mobile phone or doesn't work at all

The phone can be in "quiet mode" and in this case the call is disconnected

You need to turn off the "quiet mode" (on many devices you need to press and hold the "#" or "*" button)

The alert mode may be “vibrate only” or “silent”

You need to turn on the sound notification in the "sound settings" menu.

And possibly a consequence of moisture getting into the phone.

The call is out of order. You need to contact the service center. It may be necessary to replace the flat cable if your phone is a clamshell or a slider.

Cell phone vibration does not work

Moisture that once got in may be to blame.
Perhaps the vibration motor itself is out of order - it needs to be replaced

If your mobile phone has a clamshell or slider form factor, then quite often the vibration motor stands next to the display at the top of the phone. The reason for the inoperability of the vibration alert in this case may be a loop. One or more of the vibration-producing conductors may be damaged. Replacement of the loop is required.

Speaker does not work: you are heard, but you are not

Perhaps your phone's volume is turned down to a minimum. In this case, it is enough to simply turn up the volume during a call. In phones of the "clamshell" or "slider" form factor, the fault may lie in the loop. One or more of the sound conductors on the loop are damaged. Replacement of the loop is required.

Perhaps the speaker does not work yet due to mechanical damage. This can only be found out at the service center.

The microphone in the mobile phone does not work: you hear, but you cannot.

Usually the problem lies in the microphone itself. If in the process of diagnostics it turns out that it is the microphone that is "guilty", then it will have to be changed.

If it comes on a phone with an active flip (a flip-up part with a microphone), the reason may be a microphone loop - a transitional part between the flip and the phone.

Moisture that once got into the phone can lead to such consequences.

Several elements are responsible for the operation of the audio channel in a cell phone. It is possible to find out which one of them is out of order only in the conditions of the service center.

Another important reason for this can be a software failure, which also entails contacting a service center for the repair of cell phones.

Cell phone won't charge

The reason may be hiding in the phone charger. An easy way to find out is to find a charger from the same model. But keep in mind: exactly the same !!! If you insert a charger from a different brand into the phone, even if the connector fits, then the phone itself may fail. As an example, many Samsung and LG phones have the same charging socket. But their chargers are different due to the fact that power is supplied to different pins of the charging connector. And, if you connect an LG charger to a Samsung phone, as a result, the phone's processor is likely to fail. Replacing it is expensive. And it also happens that after that it is completely impossible to repair the phone.

The next reason may be in the phone's charging connector itself. It happens that when you start wiggling the connector charger in the phone's charging socket, and the indication starts to show that the phone is charging. In this case, replacement of the phone charging connector is required. Contact the service center.

If the charging indicator shows that the phone is charging, but in reality after charging the phone either does not turn on at all, or there is enough charge for a couple of minutes, then you cannot do without contacting a service center. The reasons can be many: from a software failure to the failure of the electronic components of the phone.

Mobile phone restarts (restarts)

In this case, several main reasons can be distinguished, for example, a software failure.

It also happens that the fault of the reboot is a failed power amplifier of the phone. When turned on, it starts to consume too much current, the phone turns off and turns on again. At the same time, it seems that the phone is rebooting. In this case, the repair is possible only in the conditions of the service center.

Another reason may be mechanical damage to the printed circuit board of the phone or its elements. This is usually a consequence of falls or bumps. Sometimes this can be checked by bending the phone with your hands (quite hard): if the phone turns off after that or "freezes", then this is the reason. The phone has a direct road to the service center.

Also, one of the reasons may be the phone's battery.

Mobile phone runs out of battery quickly

Most often this happens due to bad battery... You can check at home empirically - ask to change the battery for one day with a friend who has the same phone.

This can also happen because of the charger - the phone is not fully charged. As a rule, this happens when using a "non-native" charger or "Chinese" one.

If the phone sits down when you call and you just charged it, the problem may be in the phone's power amplifier (transmitter). This often happens when the phone is dropped. In this case, you need to contact the service center.

If you have a “smartphone” type phone, they can quickly run out of power due to a virus like “Carib”. This virus does one simple action - it constantly turns on Bluetooth, which drains the battery. The virus is transmitted via Bluetooth itself. The easiest way to protect yourself is to set the Bluetooth access settings - "NOT FOR ALL". And try to install an antivirus, as it is impossible to remove the virus without loss. Deleting will completely clear the phone memory.

In general, there are many options for why this can happen. You will have to contact a service center for the repair of cell phones.

The phone works with only one operator

Such phones are called - "locked under the operator." Their code is programmed with the data of a specific operator, under which it is "locked", and when you try to insert a SIM card of another operator, the device protests. There are only two options: either use the SIM card of this particular operator, or contact the service center.

The cell phone does not see the SIM card or writes a SIM card error message

One of the reasons may be hiding in your SIM card:

• Its validity period has expired
• The account has run out of funds
• SIM card is out of order

You can check if this is the case by inserting another card into your phone. For the purity of the experiment, it is better to use a card of the same operator as yours.

Perhaps the phone is "locked" (coded) for a specific operator, and you are trying to insert a card from another operator. In this case, you either need to use the SIM card of the operator, under which the phone is locked, or contact the service center. However, they will not always be able to help you.

It is possible that the SIM card contacts or the SIM receiver contacts on the phone are dirty or oxidized. Try to wipe all contacts with an ordinary eraser.

It often happens that the contacts of the SIM card do not reach the contacts of the SIM receiver. Try to fix this by placing a piece of paper, folded 3-4 times between the SIM card and the battery. This is possible if the device is structurally designed in such a way that there is a SIM card under the battery, and it is not in a special card reader.

In all other cases, you need to contact the service center.

Cell phone freezes

A common cause is mechanical damage to the phone's printed circuit board or its components. This is usually the result of falling or being hit. Sometimes this can be checked by bending the phone with your hands (quite hard): if the phone is turned off or "freezes", then this is the reason. Contact the service center.

Another reason may be a software failure. For example, in modern Nokia phones it looks like this: after switching on, the word NOKIA appears on the screen and the phone "freezes", that is, it does not react to anything else. You have to disconnect the battery for the image to disappear. It's time to go to the service center ...

Your phone turns itself off

Sometimes the reason for this is a bad battery or a poor connection between the contacts of the battery and the phone.

And the most common reason is mechanical damage to the printed circuit board of the phone or its elements. This usually occurs after falling or being hit. Sometimes you can check it by bending the phone with your hands (rather hard): if the phone turns off after that or "freezes", then this is the reason. You will have to contact the service center.

It also happens that self-shutdown occurs due to a software failure. It happens less often, but it does happen. In this case, it is also better to fix the breakdown at a service center.

Cell phone turned off and won't turn on

Try to charge the phone first, leaving it on charge for 24 hours.

Perhaps the reason is moisture that once got in. In this case, diagnostics are required.
A software glitch is often the culprit. You need to contact the service center.

One of the microcircuits could fail, which, for obvious reasons, led to inoperability up to the "non-inclusion".

It is possible that the battery has failed.

The cell phone turns on "every other time"

Usually the power button is to blame (especially in Nokia and Sony - Ericsson phones). Its replacement is required.

Another reason is that water once got into the phone.
Mechanical damage can also be a consequence. This can only be determined at a cell phone repair service center.

The joystick does not work in the mobile phone

If the joystick is bad, but still works, then the problem is most likely in the joystick itself. It is best to replace it and not waste time and money on repairing it. As practice shows, refurbished joysticks do not last long.

If the joystick does not work at all, the joystick itself may be to blame. But there are also cases, as well as with non-working buttons: the reason lies inside the phone. The processor is fully responsible for the keyboard and joystick. So both the keyboard and the joystick may not work due to their failure.

More precisely, they will tell you in our service center after diagnosing the phone itself.

Cell phone asks to enter "phone code"

Basically, in this case, it is enough to enter this code, and access to the phone will be open. But this is not always the case. If, after entering the correct code, namely the correct one, access did not open, then it means that there was a failure in the software. Phone software change required.

If you do not know which code is correct, refer to the instructions of your phone. There you can find the standard phone code, which was entered at the factory, and enter it into the phone.

If you still fail, the service center will help you.

Cell phone does not connect to computer

The first reason could be the computer itself, a program, or a setting in the computer.

If the phone is connected to the computer using a cable, then the reason may be either the cable itself or the connector in the phone. Try cleaning the connector pins on your phone.

If all of the above is in order, then start checking the connection settings on the phone.

If the computer has nothing to do with it, and it is configured correctly, and the "computer-phone" connection itself is in order, and the phone is configured correctly, only in this case it makes sense to contact a service center for the repair of cell phones.

Ingress of moisture into the cell phone. At the slightest ingress of liquid inside the phone, the process of formation of electrochemical corrosion starts, which is primarily detrimental to the motherboard of the phone. It may not appear outwardly immediately, but after a few days. It can stop only in case of complete evaporation of the liquid or when the battery is completely discharged. Therefore, if your phone gets into liquid or liquid gets into it, then immediately take out the battery and run to the service center. Do not try to dry your phone with a hairdryer, and even more so do not try to put it in the microwave. Do not overheat the internal elements of the phone! All this can lead to irreversible consequences.

Mechanical damage to a cell phone

Mechanical damage to a cell phone. Cell phones are fragile enough. This is especially true of clamshells and sliders, which are more susceptible to external damage than others, but this does not lose their popularity. There are many reasons for mechanical damage: a car ran over, fell from a great height, a child played, an obese person sat down, a phone in a leather case was gnawed by a dog, etc. etc. External malfunctions with such damage are easily eliminated. The lightest of these are the replacement of the case, keyboard and display. The situation is more complicated with internal breakdowns that require serious repair at the service center. This can include damage to the circuit board, processor, or mobile phone cable. Let's consider each of these cases in more detail.

Cell phone display damage

Damage to the display of a cell phone can manifest itself in different ways: the screen does not light up, some part of it does not work; the image is there, but with stripes or darkened. Most often, it is simply necessary to replace a damaged or broken screen. But there is a possibility that even after replacing the display, the problem remains, since the reason may lie in a malfunction of the microcircuits or the telephone cable. Therefore, contact a reputable service center where damage can be recognized at an early stage in the diagnosis.

Plume

A flat cable connects one part of the phone to another with conductors. Situations arise, one or more conductors become unusable. The main signs of this phenomenon: incorrect work cameras, no picture, keyboard and speaker interruptions. Damage to the cable is equally typical for sliders and clamshells of all brands and models. It is necessary to replace the faulty loop with a new one. It is worth noting that the replacement cost can vary depending on the popularity of the model.

Damaged charger connector

Damage to the charger connector also ranks high on the list of breakdowns. Therefore, if your cell phone stops charging, then do not panic and first try to charge the phone with a different adapter, because, perhaps, it’s not the phone at all. Remember that you need to insert the same charger, and not just an adapter with the same connector (as, for example, in many LG and SAMSUNG models). Otherwise, it can lead to the failure of the processor, the repair of which is expensive and often unprofitable. But if the second charger did not help, then most likely the problem is in the connector. This is especially noticeable when moving in the charger connector, when the charging indicator changes with a wave of the hand: it is charging, then it is not charging. The connector needs to be replaced, which can be done at a service center. If the charging indicator says that the phone is charged, but in fact it is the other way around, then the matter is serious: the problem is in the software or in the failure of the electronic components of the device.

Battery

Battery. The reason for the reluctance of the phone to charge may lie in a battery malfunction. The easiest way to test this is by inserting a similar battery that works well. It is also possible that you are charging your phone with a non-native, Chinese charger, which can not only fail to charge your phone, but also disable it. In the event that you are the proud owner of a smartphone, the problem may lie in the Carib virus, which spontaneously turns on Bluetooth and thereby drains the battery.

Cell phone speaker

A cell phone speaker also has a certain tendency to malfunction. Either his hearing deteriorates, then suspicious noises are heard, or even just silence. It also happens that during a conversation, the sound of the interlocutor's voice begins to disappear or they cease to hear you. This is due to the fact that on motherboard microcracks appeared, which significantly affect the performance of the speaker; or the phone case is seriously damaged. This most often happens with mechanical stress on a mobile phone.

Cell phone processor

When the processor fails, the speaker stops working first. Also, the processor is responsible for the operation of the keyboard and joystick. Therefore, a processor failure can cause the entire control panel to behave inappropriately. But, it should be noted that the joystick most often does not work due to a breakdown of the joystick itself. It is difficult to figure out the causes and consequences of damage on your own, so contact a specialized center, where they will explain and help you in an accessible and detailed way.

Reboot your cell phone

There can be many reasons for rebooting, but one conclusion is that a thorough examination and repair of a cell phone is necessary. The problem is most likely due to a software glitch. Another reason may be a broken phone power amplifier (transmitter). It starts to consume too much power when turned on and leads to the fact that the phone starts to turn on and off. Falling, strong or systematic impacts may damage the printed circuit board phone, which also provokes a reboot. It is easy to check this, if the phone “freezes” or turns off when the case is squeezed, then this is the problem. And then only a specialized service center can save your phone.

SIM card cannot be read

If your phone does not read the SIM card, then first of all make sure that its expiration date has not expired. Remember if your phone is coded for a specific operator. If this is not the case, then inspect the SIM card for contamination and oxidation. In this case, cleaning the contacts is necessary. In case of any other outcome of a superficial examination of your phone, it is better to immediately contact a specialist. It is quite possible that the phone's card collector could not stand the repeated replacement of the SIM card and "worn out".

Samsung smartphones

Samsung phones and smartphones need no introduction, as they have long proven themselves at their best. But, no matter how good these gadgets are, like any other technique, they tend to fail periodically. Of course, this is rare, but no one is insured against breakdowns.

Let's take a look at the most typical malfunctions smartphones and methods of their elimination.

The phone does not turn on or does not accept charging

The reasons for this malfunction:

• getting into the phone with water or other liquids;
• falling or hitting a smartphone;
• charger does not work;
• the battery is out of order;
• software glitch.

To solve this problem and repair Samsung smartphones you should contact an experienced technician or service center.

The phone does not find the network

Possible reasons:

• problems with the sim card;
• the firmware of the smartphone is unsuccessful.

If changing the SIM card does not help solve this problem, then repairing a Samsung smartphone consists in replacing the firmware of the device.

The phone display goes out or does not work properly

The display may simply not work or show color bars, White screen etc. A similar phenomenon may occur due to rough handling of the smartphone, for example, it may be frequent shocks, falling, high pressure, liquid ingress, etc. The same reasons can lead to failure of the speaker or microphone, camera or keyboard, as well as other elements of the smartphone.

In this case, before repairing the mobile Samsung phones, a thorough diagnosis should be carried out to determine the true cause of the malfunction.

Smartphone freezes or reboots on its own

Such breakdowns are often accompanied by a refusal to transfer SMS messages and data using Bluetooth. The reasons here also lie in a careless attitude to the gadget, but it may also be in the case of installing low-quality software. Therefore, repairing Samsung phones here will most likely be reduced to changing the phone's firmware.

Other malfunctions of smartphones

The malfunctions described above, unfortunately, are far from all that the owner of a Samsung phone may encounter. Very often there are problems with the headphones and the work of the speaker of the phone. In this case, repairing Samsung smartphones consists in replacing faulty elements with new ones.

The cell phone got into water or the phone fell into the water itself.

The first thing to do is disconnect the battery from the phone. Then try to somehow dry the device with a hairdryer, put it on the battery overnight, put it in a warm place for a couple of days, etc. Perhaps after that the phone will work without problems. Although, as practice shows, the lion's share of phones arriving for repair were previously exposed to water (this is evidenced by rusty spots inside, oxidation, deposits, etc.), and who knows why the phone really failed this time. In any case, it can be argued that it was the water that once got there that played an important role.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise, the phone may become partially or completely inoperable. Let me emphasize that it is possible, not required. But the oxidation (rusting) process can take a long time, and it is impossible to say how the phone will behave the next day or in a month. The more time has passed since the moment of moisture ingress, the less likely it is that the phone will be fully operational in the event of a breakdown.

The cell phone does not catch the network.

The first thing you need to pay attention to is whether the phone shows any level of reception on the display. If it does, then the network you have chosen may not support your operator. To do this, go to the "SETTINGS" menu and select the "AUTOMATIC" network search mode. If this does not work out, try to select your network manually, in the same menu.
The next reason may be in your SIM card:
Its validity period has expired

SIM card is out of order

If all of the above does not help, then the problems lie in the phone itself. There are many of them: from software failure to failure of the electronic components of the phone.

SMS is not sent from a mobile phone.

The most common reason this - the number of the Short Message Center (SMS Center) is incorrectly specified, or it is completely absent. In fact, short messages (SMS) are sent to this number, and the mobile operator further redirects your short messages (SMS) to the recipient's number. Each mobile operator has its own SMS center number. Check with your mobile operator for this number.
The number of the Short Message Center (SMS Center) is entered in the submenu of the cell phone SETTINGS, in the menu MESSAGES.
Also, short messages (SMS) can be blocked by a mobile operator due to non-payment or other reason.

Doesn't show cell phone display.

One of the reasons may be a defect in the display itself. Its replacement is required.
If we are talking about a "clamshell" or "slider" type phone, then in this case the loop may be the reason. It is a flexible piece with conductors that connects one part of the phone to another. One or more of these conductors may be damaged. Replacement of the loop is required.
We can also talk about a defect that arose after moisture got inside the phone. In this case, careful diagnostics and cleaning are required, and possibly more serious repairs.

Cell phone screen stripes.

If the display itself is damaged, this is worst of all, although visually this may not be visible. Display replacement required.
If the phone is a "clamshell" or "slider" type, this may be due to damage to the loop - the transitional part from one half of the phone to the other.
This can also happen if moisture gets inside the phone.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise .... (described above).

The mobile phone keyboard does not work or is not fully functional.

Most often this occurs from moisture ingress. In the best case, it is required to clean it from oxidation, if, of course, it has arisen only under the keyboard.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).
It can also happen after a fall or hit. In this case, a complete soldering of the phone is required.
The processor is fully responsible for the keyboard. So the keyboard may not work due to its failure.

The call in the mobile phone rattles or does not work at all.

The phone is in "quiet mode": in this case, the call is disconnected
turn off the "quiet mode" (on many devices you need to press and hold the "#" button)

Alert mode is set to "vibrate only" or "mute"
enable sound notification in the "sound settings" menu

Moisture got into the phone
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).

The call is out of order.
In "clamshell" or "slider" phones, the reason for this may be a damaged cable. It is a flexible piece with conductors that connects one part of the phone to another. One or more of these conductors on the loop are damaged. Replacement of the loop is required.

The speaker does not work: you are heard, but you are not.

It may seem ridiculous, but there are very common cases when a phone is brought to a service center with the volume turned down to a minimum and they complain that nothing is heard. In this case, it is enough to turn up the volume during a conversation.
If we are talking about a "clamshell" or "slider" phone, then the problem may lie in the loop. It is a flexible piece with conductors that connects one part of the phone to another. One or more of the sound conductors on the loop are damaged. Replacement of the loop is required.
This is also possible due to mechanical damage.
The rest of the reasons lie inside the phone.

The microphone in the mobile phone does not work: you hear, but you - no.

Usually the problem is with the microphone. If in the process of diagnostics it turns out that the microphone "flew", it needs to be changed
If we are talking about a phone with an active flip (folding part with a microphone), then the reason may be a microphone loop - the transition part between the flip and the phone
Moisture that once got into the phone can lead to such consequences.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).
Several elements are responsible for the operation of the audio channel in the phone. Find out which one is out of order.
Also, the reason for this can be a software failure.

Cell phone won't charge.

The reason may lie in the phone charger. A simple example to find out is to find a charger from someone you know from the same model. But I repeat: exactly "the same" !!! If you insert a charger from another brand into the phone, provided that the connector fits, then the phone itself may fail. For example, many Samsung and LG phones have the same charging jack. But their chargers are different due to the fact that power is supplied to different pins of the charging connector. And if you connect an LG charger to a Samsung phone, the phone's processor is likely to fail. Replacing it is an expensive process. And it happens that it is completely impossible to repair the phone after that.
The next reason may be in the phone's charging connector. For example: it happens that you start wiggling the charger connector in the phone's charging socket, and the indication starts to show that the phone is charging. In this case, replacement of the phone charging connector is required.
If the charging indicator shows that the phone is charging, but in reality, after charging, the phone either does not turn on, or the charge is enough for half a call. The reasons can be many: from a software failure to the failure of the electronic components of the phone.

Mobile restarts (restarts).

There are several things we can talk about here, such as a software failure.
It happens that the fault of the reboot is a failed power amplifier of the phone. When turned on, it starts to consume ***** too much current, the phone turns off and turns on again. But it seems to us that the device is rebooting.
Another reason may be mechanical damage to the printed circuit board of the phone or its elements. This usually occurs after falling or being hit. Sometimes this can be checked by bending the phone with your hands (quite hard): if the phone turns off after that or "freezes", then this is the reason.
Also, one of the reasons may be the phone battery.

The cell phone runs out of battery quickly.

This is most often due to a bad battery. You can check at home empirically - ask to change the battery for one day with a friend who has the same phone.
This can happen due to the charger - the phone does not charge properly. As a rule, this happens when using a "non-native" charger, in other words, a "Chinese" one.
If the phone sits down on a call and you just charged it, the problem may be with the phone's power amplifier (transmitter). This often happens when the phone is dropped.
If we are talking about smartphones, then they can be quickly discharged due to a virus like "Carib". This virus does one simple action - it constantly turns on Bluetooth, which drains the battery. The virus is transmitted by airborne droplets, that is, via Bluetooth. The easiest way to protect yourself is to set the Bluetooth access settings - "NOT FOR ALL". And it will not damage the installed antivirus, since it is impossible to remove the virus without loss. Deleting will completely clear the phone memory.
There are many options for why this can happen.

The cell phone does not see the SIM card or writes a SIM card error message.

One of the reasons may be in your SIM card:
Its validity period has expired
The account has run out of funds
SIM card is out of order

The easiest way to check this is to insert another card into your phone. For the purity of the experiment, it is better to use a card of the same operator as yours.
Perhaps the phone is "locked" (coded) for a specific operator, and you are trying to insert a "foreign" (other operator) card. In this case, use the SIM card of the operator, under which the phone is locked.
It happens that the contacts of the SIM card or the contacts of the SIM receiver on the phone are dirty or oxidized. Try to wipe all their contacts with an ordinary eraser.
It often happens that the contacts of the SIM card do not reach the contacts of the SIM receiver. Try to fix this by placing a piece of paper, folded 3-4 times between the SIM card and the battery. This is possible if the device is designed in such a way that there is a SIM card under the battery, and it is not in a special card reader. Siemens models SL45, A50, A52, A60 can be cited as an example.
Nokia N71 - an interesting case: oddly enough, but the SIM card may not be visible to the phone due to bad contact battery with your phone. Try using an eraser to clean the center contact on the battery and the corresponding contact on your phone. It may be the same with other Nokia models. Inexplicable but the fact!
Nokia 8800 does not see the SIM card periodically: we have encountered such a case many times. And also a strange case - to try to replace the battery. Due to the flat battery, the SIM card may not be visible.

The joystick does not work in the mobile phone.

If the joystick is bad, but it works, then the problem is most likely in the joystick itself. It is best to replace it and not bother with repairing it. As practice shows, refurbished joysticks do not last long.
If the joystick doesn't work at all, the joystick may be the culprit. But there are cases, as with non-working buttons: the reason lies inside the phone. The processor is fully responsible for the keyboard and joystick. So both the keyboard and the joystick may not work due to their failure.

The cell phone asks for a "phone code".

Usually, it is enough to enter this code, and access to the phone will be open. But this is not always the case. If after entering the correct code, I repeat - the correct one, access is not opened, then there has been a software failure. Phone software change required.
You neither sleep nor spirit do not know about this code, that is, you personally did not enter it there, in this case, referring to the phone's instructions can help. There you can find the standard phone code, which was entered at the factory, and enter it into the phone.

The cell phone does not connect to the computer.

The first reason could be a computer, a program, or a setting on the computer itself.
If the phone is connected to a computer using a cable, then the fault may be either the cable itself or the connector in the phone. Try cleaning the connector pins on your phone.
If all of the above is in order, then start checking the connection settings on the phone.

Cell phone turned off and won't turn on

Try to charge the phone first, leaving it on charge for 24 hours.
Perhaps the reason is moisture that once got in. Diagnostics required.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).
A software glitch is often the culprit.
One of the microcircuits could fail, which, for obvious reasons, led to inoperability up to the "non-inclusion".
It is possible that the battery has failed.

The cell phone turns on "every other time".

Usually the power button is to blame (especially in Nokia and Sony - Ericsson phones). Its replacement is required.
The second reason is that water once got into the phone.
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).
The fault may still be in mechanical damage.

The cell phone turns itself off - self-shutdown.

This is often caused by a bad battery or poor connection between the battery and phone contacts.
The second, most common, cause is mechanical damage to the phone's printed circuit board or its elements. This usually occurs after falling or being hit. Sometimes this can be checked by bending the phone with your hands (quite hard): if the phone turns off after that or "freezes", then this is the reason.
Also, it happens that self-shutdown occurs due to a software failure. This happens less often, but it also has a place to be.

Cell phone vibration does not work.

Moisture that once got in may be to blame
In all cases of moisture penetration under the phone case, it is necessary to dry and clean the device. Otherwise ... (described above).
Perhaps the vibration motor itself is out of order - it needs to be replaced
If we are talking about a clamshell phone, then often the vibration motor stands next to the display at the top of the phone. The reason for the inoperability of the vibration alert in this case may be a loop. It is a flexible piece with conductors that connects one part of the phone to another. Consequently, one or more of these conductors responsible for vibration are damaged. Replacement of the loop is required.

The phone works with only one operator.

Such phones are called - "locked under the operator." Their program code contains the data of a specific operator, under which it is "locked", and when you try to insert a "foreign" SIM card, the device "swears". There are only two options here: either use the SIM card of this particular operator, or unlock it.

Cell phone freezes.

A common cause is mechanical damage to the phone's printed circuit board or its components. This usually happens after falling or being hit. Sometimes this can be checked by bending the phone with your hands (quite hard): if the phone is turned off or "freezes", then the reason is this.
The same reason can be a software failure. For example, in modern Nokia phones it looks like this: after switching on, the word NOKIA appears on the screen and the phone “freezes”, that is, it does not react to anything and does not show signs of life. You have to disconnect the battery for the image to disappear.

Fast phone power test.

We take the Digital Power Supply, set 4 volts and connect it instead of the battery.
If the current consumption is higher than 300 mA, then there is a breakdown in the power supply, watch the power supply.
If the protection is triggered, it means the transmitter is out of order, we change the transmitter.
If it does not consume anything, then everything is fine.
If, when you press PWR, the consumption is more than 100Ma, then one of the stabilizers (five-legged) has come out.
If the current is not more than 30Ma, then the software does not work.

Malfunction of the mobile - typical malfunctions and cell phone repairs are available.