When you turn on the tablet, the operating system does not load. The tablet does not turn on: possible problems and methods for solving them. Troubleshooting and repairing the Power tablet power button

27.02.2020

The tablet is small in size mobile computer, which appeared on the market thanks to Apple in 2010. Distinctive feature The difference between a tablet and a desktop computer or laptop is the lack of a keyboard and mouse. To control the operation of the tablet, just touch the screen with your fingertip (tap in slang) at the desired point, and to turn pages, just slide your finger across the screen in the desired direction.

Thanks to their small size, weight and ease of control, tablets instantly conquered the whole world and today, in any corner of the planet, in the most unexpected place, you can meet a person with a tablet in his hands. The mobility of the tablet not only opened up new communication opportunities, but also provoked additional tablet malfunctions associated with their mechanical breakdowns. The tablet can be accidentally dropped, sometimes people sit on it or step on it.

All tablet malfunctions can be divided into two types - software and hardware. Software failures in the operation of the tablet occur in the event of a malfunction of the software and are eliminated by flashing firmware or reinstalling the non-working application. Hardware failures (mechanical and electrical) are associated with the failure of tablet elements, such as microcircuits, transistors, resistors, capacitors, batteries, buttons, touch screen or matrix.

In this article, using the example of repair Acer tablet A500, a method for repairing a tablet with mechanical damage to the power button located on its body is considered. Due to a broken button, the tablet could not be turned on or off.

If the tablet does not turn on, what should I do?

If suddenly the tablet, which has been working stably up to this point, does not turn on the next time it is turned on by pressing the Power button, many fall into despair. After all, I really wanted to chat with friends or wander around the Internet. The first thing you need to do is calm down and analyze the situation to determine possible reason tablet failure.

Reasons why the tablet may not turn on

The tablet may not turn on for one of the following reasons:

The battery is low.
Power adapter failure.
Incorrect operation of the software.
Failure of the Power button, battery and other components.

The list of faults is listed in order of frequency of their occurrence. Let's look at how you can determine the cause of a tablet malfunction and how to repair it.

Tablet battery is dead

If the tablet was working for a long time, and it was not turned off with the power off button, then it is quite possible that you will not be able to turn it on next time. Although the tablet is through set time It automatically goes into sleep mode, but still continues to consume a small amount of electricity. If the battery is completely discharged while the tablet is not in use, the tablet will automatically turn off and it will be impossible to turn it on using the power button.

To revive the tablet, you need to connect the power adapter to it and press the power button and hold it down for more than three seconds. The tablet should turn on and load the software.

The power button may not respond if the tablet long time was outside at negative air temperatures. This is due to the fact that at negative temperatures any battery loses its ability to fully supply electricity.

It is unacceptable to immediately turn on the tablet after strong cooling. After bringing the tablet from a frosty street into a warm room, it is necessary to wait at least half an hour until the tablet warms up and the condensation that has fallen on its surface evaporates. Moisture on electronic components may cause the tablet electronics to fail.

The tablet may also not turn on without connecting the power adapter to it if the battery is faulty. The battery may fail prematurely due to its poor quality, being in a state of deep discharge for a long time, or as a result of exhaustion. High-quality batteries last from 3 to 5 years, and over time the tablet's operating time is offline mode due to battery aging, it gradually decreases.

Installed in tablets lithium ion batteries, which do not tolerate long-term deep discharge. This condition of the battery greatly reduces its service life and can even completely destroy the battery. Therefore, if a notification appears on the tablet screen about the need to connect the charger, this should be done as soon as possible. The battery also needs to be fully charged before leaving home or before leaving the tablet for a long period of time.

On any screen electronic devices When running on battery power, a dynamic icon is always displayed indicating the battery charge level. The icon is a battery shaded partially or completely in white, as shown in the photo to the right. When the battery is all shaded, the battery is fully charged.

Malfunctions and repair of the tablet power adapter

The tablet power adapter is an electronic unit that converts AC voltage household network 220 V voltage direct current 12-18 V. The voltage depends on the tablet model.

The adapter is also designed for a certain load current and therefore it is unacceptable to thoughtlessly use a power adapter from other devices instead of the standard one, even if the connection connector is suitable, since you can damage the tablet.

The tablet's power adapter has a frayed wire.

Despite the high reliability of power adapters for tablets and laptops, even Chinese ones, it happens that they fail. In most cases, this occurs due to violation of operating rules. Some users, when working on a tablet with the adapter connected to the mains, due to the insufficient length of the wire, pull it like a string. It happens that the adapter wire is chewed by pets.

As a result, where the wire exits the connector, it frays, or the contacts in the tablet socket are deformed, and the supply of voltage to the tablet occurs intermittently and eventually stops altogether.

If, when working on the tablet with the power adapter connected, the lightning symbol on the battery icon periodically disappears, this indicates that the wire has partially frayed or the contacts in the adapter power connector socket have become deformed.

In order to determine where the contact is lost, you need to insert the adapter connector into the tablet and, pressing it against the tablet, make sure that lightning appears on the battery icon. Then crumple the wire. If the lightning disappears, then the wire is to blame. If the lightning does not disappear, then the reason is bad contact detachable connection. The plug needs to be inspected. If there are no external signs of its mechanical destruction, then deformation of the contacts in the mating part, which is installed in the tablet, has occurred. Replacing the connector in the tablet is possible only in a service workshop.

Tablet power adapter does not output voltage

If previously, when the tablet was running, the battery was steadily charging, and suddenly the battery stopped charging, although the battery was not yet fully charged, then the adapter was inserted into a de-energized or faulty outlet, or it was faulty.

Any power adapter always has a sticker that indicates all its specifications, including output voltage and permissible load current. For example, the adapter label below states that the adapter provides an output voltage (OUTPUT) of 19 V and allows maximum current load 2.15 A.

You can find out whether the power adapter is to blame for the fact that the tablet does not turn on using the power button by measuring the voltage at the output connector of the adapter with a voltmeter.

To do this, just use the ends of the probes of the multimeter, turned on in the DC voltage measurement mode, to touch the central and external terminals of the connector. The plus is usually located on the center pin of the connector. If the voltage value is equal to or greater than that indicated on the sticker, then the adapter is working and the cause of the malfunction lies in the tablet.

How to repair a tablet power adapter yourself

If diagnostics show that the tablet does not turn on due to a faulty power adapter, then there are two ways to solve the problem - buy a new adapter for $15 or repair the faulty one yourself.

In order to accurately determine whether the wire or electronic unit of the power adapter is faulty, it must be opened. Typically the adapter body consists of two halves glued together. To separate the halves, you need to insert the flat blade of a screwdriver into the gap near the outlet of the adapter cord and gradually move the halves apart around the perimeter. Sometimes this is not very easy to do, but, as a rule, it is always possible without damaging the outer surface of the case.

After opening the adapter, access to the place where the cord wires are soldered will open. To localize the failure, you need to use an ohmmeter to ring each of the wires of the cord in turn, touching one probe to the place where the wire is soldered, and the second to the corresponding terminal of the connector. In this case, it is necessary to bend and stretch the cord. If the resistance of the wires is close to zero and does not change when exposed to the cord, then it is working properly, and you need to check the operation of the electronic part of the adapter.

Attention, part of the electronic board of the adapter is not galvanically isolated from the household network and touching the exposed parts of parts and printed conductors is dangerous to life.

If the cord is in good condition, then you need to check the operation of the electronic part. To do this, you need to connect the adapter to the power supply and measure the voltage at the soldering contacts of the cord wires with a voltmeter. It is best to use a “Pilot” type extension cord with a switch as an outlet. The “Pilot” switch must be set to the off position and the adapter must be inserted into one of its sockets. Next, set the multimeter to DC voltage measurement mode and touch the soldering points of the output cord wires. Enable "Pilot". The voltage must be equal to or greater than that indicated on the label.

If there is no voltage, then it is necessary to inspect appearance electronic parts, printed conductors and electrolytic capacitors (blue cylinder in the photo) for the presence of swelling or traces of electrolyte leaks. If there are any, then they need to be replaced.

Repairing the adapter electronic board requires knowledge and experience working with measuring instruments. If an external inspection fails to identify the failed element, you can complete the repair and buy a new tablet power adapter.

If the cord is broken at the point where it exits the adapter, it can be shortened, the insulation removed from the ends and soldered, observing polarity, into a printed circuit board. If the break is located at the entrance to the connector, then a complete replacement of the cord will be required, since when replacing only the connector it is impossible to securely fasten the wires in it. When purchasing a new cord, you should choose one with a connector of the same size that was previously installed.

When soldering the cord into the board, you must observe polarity. On the adapter board shown in the photograph, the polarity is marked “ + " And " - " is not indicated. But it is already clear that the negative wire (external contact of the connector) is always soldered into the hole marked GND (common wire), and the positive wire (central contact of the connector) is always soldered into VO. There is no standard for the color of adapter wires, and therefore, before soldering the wires into the board, you need to test them using a multimeter.

All that remains is to place the cord in the recess of the adapter body and close its halves. To glue the body, you need to lubricate the joint along the entire circumference with Super Moment universal second glue, press the halves tightly against each other and leave in this position for several minutes. But before gluing, it is advisable to connect the power adapter to the tablet and check its operation. If the tablet immediately turns on and the battery begins to charge, then you can glue the adapter case and at this point, repairing the tablet power adapter with your own hands can be considered complete.

Incorrect operation of the tablet software

There are times when the tablet does not turn on when you press the Power button after rash user actions with the software, such as incorrect installation of new applications, unsuccessful firmware, change or move system files. It is possible that the tablet may be infected with a virus. In this case, the tablet turns on with the Power button, but the software does not load or does not work correctly. As a result, a picture of a broken robot may appear on the screen or the screen may remain black.

If the screen is black, to restore the tablet's operation, you can try to reboot it using the RESET button recessed into the case. Some tablets do not have an inscription, but have a red dot next to a small hole. The RESET button is specially recessed to prevent interruption of running programs if it is accidentally pressed while working with the tablet. Therefore, pressing the RESET button on the tablet can only be done using a toothpick, the end of a straightened paper clip, or a similar thin rod.

Before pressing the button, you should disconnect the tablet from the docking station and remove the SIM and flash cards. Next, press the RESET button and hold it for at least 3 seconds. The system should reboot and it is quite possible that the tablet will work.

Before rebooting the tablet using the RESET button, please note that in some tablet models the system may return to factory settings. In this case, all settings and personal information you have made will be lost. If all of the above actions do not lead to a positive result, then you should contact the service, since restoring the tablet’s operation is only possible by connecting it to another computer that has special software installed and experience working with them.

Troubleshooting
and repair of the Power tablet power button

It happens that the tablet does not turn on if the Power button does not work. A button malfunction can be easily diagnosed by the behavior of the tablet when you press it.

Diagnosing a malfunction of the Power button

Pressing a working Power button should be accompanied by the following tablet behavior:

A quiet mechanical click coming from the button.
When the tablet is in sleep mode, cause a picture to appear on the screen.
A pop-up menu will appear to turn off the tablet if it is running.

If the tablet behaves differently when you press the button, then the button is faulty and you will need to disassemble the tablet to repair it. It will be possible to work on the tablet, but it will be impossible to turn it off, and you can turn it on only by inserting the plug of the power adapter connected to the network or by pressing the RESET button. While the battery is charged, the tablet will be either in a working state or in a sleep state. It will be impossible to turn off the tablet, but it will turn off itself when the battery is completely discharged.

If after diagnostics it is determined that the tablet does not turn on due to the Power button not working, then to repair the tablet you will have to disassemble it.

How to disassemble an Acer A500 tablet with your own hands

Using the example of disassembling the Acer A500 tablet, let's look at how to properly disassemble the tablet. Before you begin disassembling the tablet, you need to prepare workplace and stock up on tools.

The table on which the tablet will be disassembled for repair must be covered with a soft cloth. The tool you will need is a screwdriver with a thin Phillips blade, tweezers of different sizes, a metal spatula, a plastic pick or a bank card.

Typically, the two halves of the tablet body are held together using latches. But some models also have screws. Sometimes they are clearly visible on the back cover, and sometimes they are hidden under rubber stops. Therefore, before disconnecting the covers, you need to carefully inspect the tablet and, if you find screws, unscrew them.

Along the entire perimeter inside the main half of the tablet, in which the screen and all the electronics are installed, there are plastic bosses with indentations, as shown in the photo above.

And along the perimeter of the back cover there are protrusions that, when the covers are closed, go into the recesses of the front part of the tablet body. When squeezing the body halves, the protrusions fit into the recesses and thus ensure reliable adhesion and tight closure of the tablet body halves. Therefore, in order to disassemble the tablet, you need to remove the protrusions from the recesses.

The fewest latches are located in the area of the volume control and tablet power buttons. Therefore, from this place it is necessary to begin separating the halves of the case.

Now that you can imagine how the latches of the tablet are arranged, you can begin to disassemble its case. The tablet should be placed on a soft cloth with the screen facing down. Next, insert the blade of a metal spatula into the gap between the halves of the tablet to a depth of a couple of millimeters, and lowering its handle down and turning slightly to open the nearest latch. As soon as a gap has formed between the halves, you need to insert a flat-head screwdriver or other object into it so that the halves do not close together again. Now, moving the spatula around the perimeter along the gap, you need to unlock all the other latches.

On the Internet you can find recommendations to use a plastic card or a pick (a small plastic thin triangle that musicians use when playing stringed instruments) instead of a metal spatula, but I was unsuccessful in trying to disassemble the tablet using them. When trying to squeeze the plastic card into the gap between the tablet covers, it became deformed. But to separate the remote control housings remote control Using a plastic card is very convenient.

The back cover, freed from the latches, must be removed carefully so as not to break the wires coming from electronic parts possibly installed in it, such as speakers, microphones or a video camera.

The back cover of the tablet has been removed, and now you can examine its internal structure to decide on the sequence of further disassembly.

If the tablet was disassembled for replacement battery, then now you need to unscrew the screws securing the cover covering the battery. Next, unsolder the wires going from the battery to the board (if soldered) or remove the connector and replace the battery with a new one. When soldering wires, polarity must be observed.

The tablet was disassembled in order to restore the operation of the Power button, which, as a result of diagnostics, was found to be inoperative. After removing the back cover and inspecting the button, it became clear why it did not work - the solder in the places where the base of the button was soldered to the printed circuit board. As a result, the button moved to the side and it became impossible to press the Power key. But it was too early to rejoice, since access to repairing the button could only be obtained after removing the motherboard with processor.

How to properly disconnect connectors and flat cables of a tablet

Difficulty in removing motherboard The problem was that many cables were connected to it using detachable connections, including several flat ones without connectors, which were very thin and easily damaged. To properly uncouple the connectors, you need to understand how their halves are held together.

Attention, it is unacceptable to disconnect the connectors by pulling them by the cable wires coming out of them, since the wires are thin and can easily break. It is especially dangerous if the wire looks intact on the outside, but inside the plastic sheath the wire is broken. Finding and fixing such a malfunction on your own will not be easy.

The simplest connectors on a tablet are coaxial, which are designed to transmit high frequency signal. The removable half of the connector is fixed to the recess in the mating part thanks to the spring-loaded rim of the split cup. To undo the connector, you need to pry the cup by the rim with the flat blade of a screwdriver.

The connectors shown in the photo do not have latches and are held in place by friction. To undock them, it is enough to grab the removable part of the connector with the jaws of tweezers and, by rocking it to the sides, remove it from the stationary part. If two identical connectors on flexible wires are located nearby, then to avoid confusion during assembly, it is advisable to mark them before disassembling the connector.

This type of connector has two tab-shaped latches on the top surface of the removable part. The tabs engage with two square-shaped holes made in the soldered part of the connector. The connector is undocked in the same way as the previous one.

To pull out the plastic inserts of the connectors, I use small tweezers 10 cm long. To prevent the tweezer jaws from slipping, they are tucked in, as in the photo. These tweezers are also convenient for pulling out the terminals of resistors, diodes and similar radioelements from the printed circuit board when desoldering.

This type of detachable connection is a flat cable, the bare end of which is pressed against the contacts in a plastic block. A black strip is visible on the connector, which is the locking lever.

To release the cable, simply turn this bar 90° clockwise, as shown in the photo, and, grasping the edges of the cable with your fingers, remove it from the connector.

To secure the cable in the connector, using minimal force, grasping its sides with your fingers, insert the cable into place in the connector.

All connectors from the motherboard are disconnected and all that remains is to peel off the pieces of tape that hold the wires in place and unscrew a few screws. The adhesive tape must be saved, since when assembling the tablet it will need to be glued to its original places.

This is how the tablet's power button came off, obviously Chinese manufacturer saved on solder. The button was installed in its original place and soldered using a ten-watt soldering iron to the printed circuit board. Additionally, the button was tested using a multimeter. When you press its pusher, the resistance becomes equal to zero, and when released, it becomes infinity.

Behind the power button there is a rather massive tablet position sensor. To avoid repeated displacement of the power button, the distance from the back wall of the button to the side of the sensor was measured with a caliper. It was three millimeters. A plate the size of a button was made from a fiberglass plate three millimeters thick.

The plate, after covering its sides with a thin layer of Moment glue, was tightly inserted between the button and the position sensor, as in the photo. Thanks to this modification of the motherboard, it became impossible to move the power button from its place even when pressing it hard.

Kingdia team 06/05/2017 11:30

I quote Tatyana:

Good evening! Help!!! I installed root rights, the tablet rebooted and froze on the screensaver!

Hello. Apparently the firmware just crashed. In order for the computer to be able to see the tablet, it must either be turned on (but for this the firmware to work) or switched to the “Download” firmware mode. In your case you need to install new firmware- . This information will help you with flashing. In general, it is best to put the tablet into flashing mode and flash it using a computer via special programs. Here is an article on the topic of firmware Chinese tablets- . They are the ones with the most problems. If you can’t flash it yourself, it’s better to take it in for repairs. Don't open it again root rights nowhere. This only makes things worse. If you are not an application and firmware developer and do not have programming experience, then this will result in additional problems and financial costs for you.

The tablet is a small-sized mobile computer that appeared on the market thanks to Apple in 2010. A distinctive feature of a tablet from a desktop computer or laptop is the absence of a keyboard and mouse. To control the operation of the tablet, just touch the screen with your fingertip (tap in slang) at the desired point, and to turn pages, just slide your finger across the screen in the desired direction.

In this article, using the example of repairing the Acer A500 tablet, we consider a method for repairing a tablet with mechanical damage to the power button located on its body. Due to a broken button, the tablet could not be turned on or off.

If the tablet does not turn on, what should I do?

Reasons why the tablet may not turn on

The tablet may not turn on for one of the following reasons:

The battery is low.
Power adapter failure.
Incorrect operation of the software.
Failure of the Power button, battery and other components.

The list of faults is listed in order of frequency of their occurrence. Let's look at how you can determine the cause of a tablet malfunction and how to repair it.

Tablet battery is dead

If the tablet was working for a long time, and it was not turned off with the power off button, then it is quite possible that you will not be able to turn it on next time. Although the tablet automatically goes into sleep mode after a set time, it still continues to consume a small amount of electricity. If the battery is completely discharged while the tablet is not in use, the tablet will automatically turn off and it will be impossible to turn it on using the power button.

To revive the tablet, you need to connect the power adapter to it and press the power button and hold it down for more than three seconds. The tablet should turn on and load the software.

The power button may not respond if the tablet has been outside for a long time at sub-zero temperatures. This is due to the fact that at negative temperatures any battery loses its ability to fully supply electricity.

It is unacceptable to immediately turn on the tablet after strong cooling. After bringing the tablet from a frosty street into a warm room, it is necessary to wait at least half an hour until the tablet warms up and the condensation that has fallen on its surface evaporates. If electronic components get wet, the tablet's electronics may malfunction.

The tablet may also not turn on without connecting the power adapter to it if the battery is faulty. The battery may fail prematurely due to its poor quality, being in a state of deep discharge for a long time, or as a result of exhaustion. High-quality batteries last from 3 to 5 years, and over time, the tablet’s battery life gradually decreases due to battery aging.

Tablets are equipped with lithium-ion batteries, which do not tolerate long-term deep discharge. This condition of the battery greatly reduces its service life and can even completely destroy the battery. Therefore, if a notification appears on the tablet screen about the need to connect the charger, this should be done as soon as possible. The battery also needs to be fully charged before leaving home or before leaving the tablet for a long period of time.

On the screens of any battery-powered electronic devices, a dynamic icon is always displayed showing the battery charge level. The icon is a battery shaded partially or completely in white, as shown in the photo to the right. When the battery is all shaded, the battery is fully charged.

Malfunctions and repair of the tablet power adapter

The tablet power adapter is an electronic unit that converts 220 V AC voltage from a household network into 12-18 V DC voltage. The voltage depends on the tablet model.

The tablet's power adapter has a frayed wire.

In order to determine where the contact is lost, you need to insert the adapter connector into the tablet and, pressing it against the tablet, make sure that lightning appears on the battery icon. Then crumple the wire. If the lightning disappears, then the wire is to blame. If the lightning does not disappear, then the reason is poor contact of the detachable connection. The plug needs to be inspected. If there are no external signs of its mechanical destruction, then deformation of the contacts in the mating part, which is installed in the tablet, has occurred. Replacing the connector in the tablet is possible only in a service workshop.

Tablet power adapter does not output voltage

Any power adapter always has a sticker that indicates all its technical characteristics, including output voltage and permissible load current. For example, the adapter label below states that the adapter provides an output voltage (OUTPUT) of 19 V and allows a maximum load current of 2.15 A.

How to repair a tablet power adapter yourself

If diagnostics show that the tablet does not turn on due to a faulty power adapter, then there are two ways to solve the problem - buy a new adapter for $15 or repair the faulty one yourself.

Attention, part of the electronic board of the adapter is not galvanically isolated from the household network and touching the exposed parts of parts and printed conductors is dangerous to life.

If there is no voltage, then it is necessary to inspect the appearance of electronic parts, printed conductors and electrolytic capacitors (the blue cylinder in the photo) for the presence of swelling or traces of electrolyte leaks. If there are any, then they need to be replaced.

Incorrect operation of the tablet software

There are times when the tablet does not turn on when you press the Power button after rash user actions with the software, such as incorrect installation of new applications, unsuccessful firmware, changing or moving system files. It is possible that the tablet may be infected with a virus. In this case, the tablet turns on with the Power button, but the software does not load or does not work correctly. As a result, a picture of a broken robot may appear on the screen or the screen may remain black.

Before pressing the button, you should disconnect the tablet from the docking station and remove the SIM and flash cards from it. Next, press the RESET button and hold it for at least 3 seconds. The system should reboot and it is quite possible that the tablet will work.

Troubleshooting
and repair of the Power tablet power button

It happens that the tablet does not turn on if the Power button does not work. A button malfunction can be easily diagnosed by the behavior of the tablet when you press it.

Diagnosing a malfunction of the Power button

Pressing a working Power button should be accompanied by the following tablet behavior:

A quiet mechanical click coming from the button.
When the tablet is in sleep mode, cause a picture to appear on the screen.
A pop-up menu will appear to turn off the tablet if it is running.

If after diagnostics it is determined that the tablet does not turn on due to the Power button not working, then to repair the tablet you will have to disassemble it.

How to disassemble an Acer A500 tablet with your own hands

Using the example of disassembling the Acer A500 tablet, let's look at how to properly disassemble the tablet. Before you start disassembling the tablet, you need to prepare your workplace and stock up on tools.

Along the entire perimeter inside the main half of the tablet, in which the screen and all the electronics are installed, there are plastic bosses with indentations, as shown in the photo above.

The fewest latches are located in the area of the volume control and tablet power buttons. Therefore, from this place it is necessary to begin separating the halves of the case.

On the Internet you can find recommendations to use a plastic card or a pick (a small plastic thin triangle that musicians use when playing stringed instruments) instead of a metal spatula, but I was unsuccessful in trying to disassemble the tablet using them. When trying to squeeze the plastic card into the gap between the tablet covers, it became deformed. But separating the housings of remote controls using a plastic card is very convenient.

The back cover, freed from the latches, must be removed carefully so as not to break the wires coming from electronic parts possibly installed in it, such as speakers, microphones or a video camera.

The back cover of the tablet has been removed, and now you can examine its internal structure to decide on the sequence of further disassembly.

If the tablet was disassembled to replace the battery, now you need to unscrew the screws securing the cover covering the battery. Next, unsolder the wires going from the battery to the board (if soldered) or remove the connector and replace the battery with a new one. When soldering wires, polarity must be observed.

The tablet was disassembled in order to restore the operation of the Power button, which, as a result of diagnostics, was found to be inoperative. After removing the back cover and inspecting the button, it became clear why it did not work - the solder in the places where the base of the button was soldered to the printed circuit board had broken down. As a result, the button moved to the side and it became impossible to press the Power key. But it was too early to rejoice, since access to repairing the button could only be obtained after removing the motherboard with processor.

How to properly disconnect connectors and flat cables of a tablet

The difficulty in removing the motherboard was that there were many cables connected to it using detachable connections, including several flat ones without connectors, which are very thin and easily damaged. To properly uncouple the connectors, you need to understand how their halves are held together.

The simplest connectors in a tablet are coaxial, which are designed to transmit high-frequency signals. The removable half of the connector is fixed to the recess in the mating part thanks to the spring-loaded rim of the split cup. To undo the connector, you need to pry the cup by the rim with the flat blade of a screwdriver.

This type of detachable connection is a flat cable, the bare end of which is pressed against the contacts in a plastic block. A black strip is visible on the connector, which is the locking lever.

To release the cable, simply turn this bar 90° clockwise, as shown in the photo, and, grasping the edges of the cable with your fingers, remove it from the connector.

To secure the cable in the connector, using minimal force, grasping its sides with your fingers, insert the cable into place in the connector.

This is how the tablet’s power button came off; it’s obvious that the Chinese manufacturer saved on solder. The button was installed in its original place and soldered using a ten-watt soldering iron to the printed circuit board. Additionally, the button was tested using a multimeter. When you press its pusher, the resistance becomes equal to zero, and when released, it becomes infinity.

28.12.2015

What to do if the tablet does not turn on? We eliminate all problems and their causes.

Yesterday everything was fine, but today the tablet does not turn on. What to do? How to eliminate the problem and return the device to working condition? Let's try to do this together so you don't have to go to the workshop.

What are the main causes of failure?

"Iron".

"Software".

“Iron” problems are associated with the fact that the device cannot turn on due to broken cables, battery failure, problems with motherboard or other parts of the device. It is difficult for the average user to fix such breakdowns: it requires technical knowledge, special tools and spare parts. And disassembling the device yourself may lead to the “burning out” of the warranty issued to you. Further repairs will need to be done at your own expense.

“Software” are associated with installed software and software: a not entirely successful update, hardware failure, virus, and others. Many users can deal with such failures. But before fixing the problem, it is still worth understanding its cause.

Let's try to figure out why the tablet won't turn on, investigate all the symptoms and fix the problem.

1. The tablet refuses to start due to battery

Remember the last time you charged your device. The device may not turn on because there is not enough battery power. If a complete discharge occurs, then even after connecting to a power source, the device will not turn on (it needs time for the battery to accumulate charge). If after 15 minutes of charging it was not possible to turn on the device, we dig further to find the cause of the malfunction.

2. Charging the gadget does not work

Have you put your device on charge and found it turned off a couple of hours later? Perhaps the charger has moved away, and the gadget simply did not have time to accumulate a charge. To check the functionality, connect other tablets and evaluate the result. Chargers often burn out.

3. Damage caused malfunctions

Cracks, dents, strange stains (“cobwebs” or stripes) are the reasons why it is important for you to pay attention to repairs. It is possible that after the tablet fell, a serious malfunction occurred, to fix which you will have to go to a specialist workshop.

4. The video adapter of the gadget “flyed”

You will not be able to start the device. To solve the problem with a faulty video adapter, you need to go to a workshop.

IMPORTANT! If the warranty is still valid (at different manufacturers it can be from 6 to 18 months), do not disassemble the tablet under any circumstances! This will void your warranty and you will have to pay to have the device repaired.

What should I do if the tablet turns on, but slows down and freezes when loading?

It is impossible to say that the tablet does not turn on. After pressing the Power button, the backlight lights up and the familiar screen appears on the screen saver. Android download...And that's all! The device does not turn on. There are many reasons for this problem. Among them:

Installed programs. You may have installed or uninstalled programs. Applications, but some kind of glitch occurred. As a result, this led to a “crash” of the system and malfunctions in its performance.

Launched malicious applications, viruses, “cracked” programs.

Forced terminated processes. You, on behalf of the administrator, terminated the processes that were responsible for the operation of the system. A failure has occurred, to resolve which you need to press the Reset button (to activate it on most devices you need a needle or a ballpoint pen).

“Roll back to factory settings” is one of the most logical solutions in such a situation.

IMPORTANT! Hard Reset returns the device to original condition(the same as it came off the assembly line). This means your files and applications will be deleted. If you want to save some information, remove the SIM card and memory card from the device before resetting the settings.

How to perform a Hard Reset?

Call up the menu by simultaneously pressing the volume up (or down) button and the power button. Before clicking, read the instructions in how exactly Hard Reset is called (it differs depending on one specific model).

A menu will open, among the items you will find Hard Reset. Select this item and activate. After this, your device will be “rolled back” to factory settings.

How to reinstall the OS?

Often, reinstalling the OS is required to restore the system. How to do it?

Download the firmware or OS version to your computer.

Connect the tablet to the computer.

We “transfer” the files to the gadget and perform the actions that the system prescribes.

The easiest way to bring “life” back to your gadget is to restore the firmware. All files will be saved and the device will return to working condition. To restore, you will need to perform a series of actions sequentially (step by step).

Remove the SIM and flash drive so that the files saved on them remain.

Press and hold Volume (upper or lower key) + Power (on/off button for your device).

Go to Settings, then select Format System.

Click on “Wipe data/factory reset” and wait for a special signal. It will indicate that the gadget has switched to reboot.

7 important subtleties you need to know about

There are damages that are very easy to identify.

All indicators light up, the device vibrates, but the screen does not light up. In 90% of cases, the problem is caused by damage to the screen or failure of the video adapter.

You cannot do a Hard Reset; even after connecting the charger, the device does not turn on. The reason lies in the battery or motherboard.

After trying to turn on the device, it freezes on the splash screen. There was a problem in software, which you need to eliminate.

The screen is on, but the touch buttons do not work. This happens due to broken contacts. Also the reason may be program level due to a glitch in the application

Every user experiences strange feelings when the tablet does not turn on. This could be a slight panic from breakage and possible loss of documents, fear about the purchase, hysteria from not understanding the cause of the problem. Your task is to calm your feelings and refuse spontaneous decisions (especially if this device is under warranty). You should not engage in independent experiments that could lead to the final failure of the device. It is better to contact the service center specialists, who will quickly put everything in order, repair the gadget and return all the information accumulated on it.

You are reading this article because you cannot start your tablet. There can be many reasons for malfunctions, they can be both hardware and software. But this article is not about that. Why the tablet won’t turn on and how to revive it, we’ll look at it in more detail in this article.

Method 1.Check charger

In order to check the charger it is easier to use a multimeter. The tablet must output 5, 9 or 12 Volts. If you don’t have a multimeter, then ask someone for a charger with the same connector as on your tablet, but be careful that the charging voltage is the same. Enough The charger often fails. In most cases this happens with Chinese tablet models. If the charging cord has USB connector – You can also try charge it via computer. It should be taken into account that the cable itself may be damaged. It is better to first ring the cable or replace it with a known good one.

You can do this a couple of times, also try to do it while connected m charger. If The tablet does not turn on in these cases, then you need to find a small hole on the tablet with the inscription RESET. Using a toothpick or other similar object, press the button.

Method 3. HARD RESET

If nothing happens after a reboot, then the Bootloader is damaged. Bootloader This is a bootloader that controls the operating system kernel to boot the tablet in normal mode. Then Hard Reset should help. Important before taking further actions remove the SIM card and memory card from the tablet. To do this, you need to hold down the power button and the volume rocker down or up (depending on the model of your devices). Will start menu in which you need to select Settings, then Format system.

Method 4.Broken power button

The tablet may not turn on due to a broken power button. As a rule, the button has a characteristic click and should return to its place after pressing. If this does not happen, you need to check it with a multimeter. Most likely there are 4 contacts, you can try p rip the button.

Method 5.Check b atarei

You need to disassemble the tablet, disconnect the cable or battery power connector and connect the power supply to it. Next you need use a multimeter and check the voltage at the battery output.

If you have a 3.7 Volt battery (charging 5 Volts), then the voltage should be between 3.9-4.2 Volts;

If you have a 7.4 Volt battery (charging 9 Volts), then the voltage should be between 7.9-8.2 Volts;

If you have enhanced battery at 7.4 Volts (charging 12 Volts), then the voltage should be in the range of 7.9-12.2 Volts.

If the voltage is lower - it means the battery is faulty.

Method 6:Checking the display

It happens that the tablet turns on, but the screen is black. And it seems that the tablet does not turn on. You need to be sure that it is charging, then turn it on and wait 15 minutes. The tablet should warm up a little one of the side parts. If so, then there is a problem with the display itself. You need to disassemble the device and look at the contacts that connect the display to fee. The latch may have slipped , this happens most often due to falls.

Method 7. Repair at a service center

professional repair equipment;

5 years of experience as craftsmen;

1 month warranty on work performed;

availability of branded original spare parts.

If you want to save time and not put your device at risk, tablet repair in Odessa carried out in service center IT service outsourcing.

If the tablet does not turn on, what should I do?

Reasons why the tablet may not turn on

Tablet battery is dead

Malfunctions and repair of the tablet power adapter

The tablet's power adapter has a frayed wire.

Tablet power adapter does not output voltage

How to repair a tablet power adapter yourself

Incorrect operation of the tablet software

Troubleshooting and repair of the Power tablet power button

Diagnosing a malfunction of the Power button

How to disassemble an Acer A500 tablet with your own hands

How to properly disconnect connectors and flat cables of a tablet

If the tablet does not turn on, what should I do?

Reasons why the tablet may not turn on

Tablet battery is dead

Malfunctions and repair of the tablet power adapter

The tablet's power adapter has a frayed wire.

Tablet power adapter does not output voltage

How to repair a tablet power adapter yourself

Incorrect operation of the tablet software

Troubleshooting and repair of the Power tablet power button

Diagnosing a malfunction of the Power button

How to disassemble an Acer A500 tablet with your own hands

How to properly disconnect connectors and flat cables of a tablet

What to do if the tablet does not turn on? We eliminate all problems and their causes.

Troubleshooting
and repair of the Power tablet power button

Troubleshooting
and repair of the Power tablet power button