Excellently familiar tablet with an online auction () It was decided to disassemble to look at the iron. They understand this kind of tablets very simply, no tools will not need, enough of your own nails. Two main parts of the body are joined by latches, screws are used in more expensive models with a metal rear cover. After unsinking the two main parts, a beautiful view of the Chinese tablet for $ 50 opens.

It looked at the fairly greater productivity of the processor, it is without cooling, there is not even a primitive heat sink, I am generally silent about the Peltier element, which is actively applied by many manufacturers. As not strange, the processor works fine, although heats up so much that it is possible to boil water.
The battery is a lithium-ion with a capacity of 1800 mA / hour by passport, in real life for the whole 2000mA / hour.

Excessive 200mA cannot extend the autonomous work of the tablet for 5-10 minutes, agree not enough! The battery itself has a charge controller that does not allow the battery to recharge and discharged below the permissible, so even a fully discharged battery is charged when charging is connected, but this controller is missing in some models, it is for this reason a fully discharged tablet will not be charged, and for charging will need to be disassembled Case and charge the battery separately.
Camera - 0.3MP passport, 1.3 in real. During video calls, this difference will be inconspicuous, but extra megapixel is very by the way, when there is no apparatus at hand, but you need to make a couple of photos for memory.

One of the most common faults of the tablets is the failure of the touchscreen or sensor as a result of its fall or other mechanical damage. To eliminate this breakdown, you suggest you will find you get acquainted with the photo and video instruction that will help you quickly and qualitatively change the touchscreen on your tablet yourself. This guide comes to most tablets existing currently.

A fairly common malfunction at which the tablet is not charged, but the reasons for its appearance can be a lot, consider everything in order from simple to more complex.

When repairing the tablet, when the main goal is to replace the power jack, it is not possible without the process of disassembly. Since in the Samsung model Galaxy Tab 3, the housing is bonded only by latches, then the disassembly of the tablet is carried out by a slightly pointed old plastic card, or a special puller - mediator

In this article you can download programs to get root rights on smartphones and tablets with the Android operating system. In addition, we will tell about the process of obtaining root rights and answer many of your questions.

Excellent program for creating scatter files, custom recovery, backups, and a lot of other for tablets working on Chinese MTK series processors. In addition, using this utility you can easily get root rights and restore IMEI electronic device When changing or loss. In some cases, before making a disassembly of the tablet, consider whether the software will not help.

This program you can download just below is used for firmware and backup firmware of various digital gadgets (tablets and smartphones) on MediaTek processors (MTK). Today, most of the phones and tablets of the Chinese assembly work on these MTK series processors. This utility can help you out and restore the performance of the device, but it can also turn your assistant to an electronic brick, it is Along always read service instructions related to firmware

I gave me an old Chinese tablet without a rear cover and a battery, to the repair of the old Chinese tablet, and the touch screen was broken. When examining the tablet residues, my gaze stopped on a small electronic module connected to the motherboard via a four wired loop.

On the reverse side of this module there is an inscription CP318 V2.5

A little search and Yandex in their results said that this is a Wi-Fi module with a USB interface, and on one of the foreign radio-friendly websites, reference instructions on this model was found. I just wanted to buy a similar device to work to create a Wi-Fi network from your working PC for a smartphone. Therefore, it was immediately decided to collect a full USB Wi-Fi adapter for a working computer. Since CP318 is powered by a voltage of 3.3 volts, and the USB port gives a little more, then it cannot be powered directly. Therefore, I decided to add a power stabilizer and USB connector to the module, in addition, it used a separate output for connecting the LED and the indication of the network connection activity.

It turned out this simple scheme homemade USB devices From the tablet.

Having climbing the path, drumming the hole, soldered the radio components. On the front side connected the connection activity LED, and the USB connector for connecting to the computer. And that's what I did.

The form pCB Made specifically under the existing box from me from some no longer necessary amazing amateurs. As a result, it is - such a bit bigger, but a perfectly working box

I brought me a non-working tablet after another repairman, which, as the owner said - you need to throw it out as it is impossible to repair it. The tablet was broken micro USB The connector for charging and transmission of data, and by itself, it has not turned on at all.

The device itself does not have any inscriptions and signs, only when turned on, as it turned out, it was possible to identify that this samsung Tab-7. True, I doubt the constructive that this is the original, I'm more inclined that it is a cheap Chinese fake. So we will restore.

Previous Lomaster reached the device even worse than he was before getting to repair - broke somehow the glass that closed the camera, scratched the sides on the body of the tablet, since he opened it unknown than, and also squeezed with a bunch of closures on the board at the connector, and motherboard I did not screw, but just threw a hanging on the loops.

Fully promoted and examined, the connector flew out, since the test of the tester showed that the power supply to the ground, and the signal lines were abnormally low resistance.

Eliminated all nutrition problems, turned off the battery, and checked it too - the controller was hopelessly dead, but there were still doubts about the bank.

Threw up temporarily his little bank of the battery, I tried to run - something began to get out, but the device at the boot stage went to the Boot Loop (Boot Loop) was not normal, since the instrument testimony was no longer a problem.

The output was as follows, go through the hardware keys in the recovery (Recovery) which turned out to be standard here, and perform all the wipes (VIPES), then the complete sharp strokes and thoroughly wipes Kesha. Check - come out of the recovery and the device successfully starts on my miracle battery.

Start Tablet via Recovery

And for all the time that the device was repaired, the battery of the tablet bank was already coming to be charged. I checked the start from her - it's up, well, we are looking for a suitable controller at hand - we open the battery from Nokia (there swallowed the bank) and drag the original and alive contact, catching the scheme, we make and put the desired conclusions on the controller board, check - the controller will not be completed Nothing, it means you need to produce the first start of the core minus bypassing on the input chain neatly tweezers. Now the controller is aware that it has a bank connected and you can solder to the load - tablet.

Everything works when checking and charges also check the temperature of the controller elements on the motherboard itself, the stability of the work and charging can, then we are well packaged and insulated the controller (used a white high quality tension), Chinese thin yellow tape does not inspire confidence, we collect further apparatus, charge , Special program test - everything works fine.

Video tablet after repair

And now we give the owner who did not hope that with this device it would be possible to work for a long time. Repairs implemented Redmoon.

The tablets are firmly entered everyday life. The first such gadget appeared in 1989. And released his Samsung. He had a black and white screen, and the tablet allowed to do very few things. Its price was astronomical - whole 3,000 dollars. Such a cost discarded potential buyers.

Therefore, the owners of such devices were those who really need similar mobile devices. Most often by buyers were entrepreneurs, company executives, high-level accountants. But today it is a completely affordable device for an ordinary person.

Components of a modern tablet

The diagram of the tablet device includes a display, touch screen, motherboard and rechargeable battery.

The display is directly a means to display visual information. The smallest diagonal size is 7 inches. The gadget with such dimensions is easily fit in hand. It is perfect for reading books. And if there is a good battery, it holds a charge for a long time. A larger diagonal starts from 8.9 to 10 inches. Large screen allows, without peering, view various video footage and movies. The touch screen is used to enter data and control the tablet. It is divided into the following types: a resistor, capacitive, matrix, projection-capacitive, screen on surface-acoustic waves and a screen with a grid of infrared rays. The main types of sensors used in the diagrams of tablets were the first three types due to their practicality and durability. The last two are extremely rarely applied due to the high cost and complexity of management.

The motherboard is an important element in the tablet scheme. This electronic "filling" includes: memory, processor, video screen and component binding. All of these components are installed on the motherboard of the tablet. This is a very "capricious" module, which can fail under the influence of moisture, temperature, voltage drop and other factors.

Charging tablet

The latter from the tablet scheme was the battery. They are divided into two types: lithium-ion and nickel-cadmium.

In most cases, the tablet is used to power Li-ion batteries. They have an advantage regarding NiCD batteries in size (with the same capacity), are characterized by low self-discharge and small operating costs for the entire service life. However, they lose the speed of discharge at a negative temperature and the presence of a protection scheme built into the gadget.

External devices connected to the tablet

The first thing that connects to the mobile device is adapters. They provide tablet and recharging rechargeable batteries. For this there is a special nest. What else can be connected to the device, these are monitors and LCD TVs. Some of the tablets are even equipped with HDMI ports that allow you to qualityly view the video. If there is no HDMI connection capabilities on the gadget, you can try to do it through Bluetooth or Wi-Fi. For example, in Samsung TVs there is a Smart TV feature that allows you to carry out such a connection. Connecting the "mouse" and keyboard has the complexity. The fact is that not all tablets support OTG mode. It is this feature that allows the gadget to recognize these devices. As a rule, information on the presence of such an opportunity is available in the passport of the mobile device. There are no special problems with the connection of the flash drive. It is enough to insert it into a USB connector and easily use. Audioarture is also connected, acoustic system And portable columns in a special nest on the tablet. There is also the possibility of connecting and wireless headphones. This will require only an additional modem. The development of the gaming industry demanded the use of joysticks and in tablets. But you need to know that not all games support this device. Wireless Internet connects using Wi-Fi. To do this, you need a modem connected to the USB port.

Best model of tablets

According to Yandex.Market, the most popular model in 2017 was Microsoft Surface Pro. This gadget has a Core i7 processor on board, which is very impressive. In the basic version it has 256 GB of internal memory. But if you wish, you can install an additional memory card slot. The screen with a diagonal of 12.3 inches demonstrates the resolution of 2736 x 1824. There are two cameras: 8 MP Main and 5 MP Frontal. The manufacturer guarantees 13.5 hours of continuous video viewing without recharging the battery. There is a "support" of the keyboard, which makes the device closer to the netbook. The only drawback can be called the price. It starts from 103,000 rubles.

Conclusion

Despite the fact that the schemes of tablets of different manufacturers differ from each other, but the functions they perform the same: maintenance cellular communication and execution of the role of the center of multimedia entertainment, as well as work on the Internet. It can be unambiguous to say that the tablet occupies an average stage between the phone and the laptop. At the same time, by increasing the "power" of the electronic "filling", constantly seeks a laptop.

The computer now will not surprise anyone, and the tablet especially. Surely, our descendants will assume that tablet PCs appeared before laptops and netbooks. And this is not surprising, because for its modest history, tablet PCs won great popularity.

For everyone, we suggest familiar with the electronic filling of the tablet computer.

In my hands turned out to be a tablet Ritmix RMD-825. Yes, the model is budgetary, cheap, but the composition of the tablets, as a rule, is different only with the power of the "Complex", there is no fundamental difference in the device.

What is inside the tablet?

The Ritmix RMD-825 tablet operates easily, the two parts of the housing are connected by snaps. I opened a special opening, which is often used when repairing cellular. Under the lid found this.

The printed circuit board requires separate consideration.

CPU.

In the center of the printed circuit board installed a single-core processor - Allwinner Tech A13(1GHz). On the photo on the left 8-pin chip in the SO8 case - this PCF8563T.(8563T.) - Real-time clock ( RTC) With a built-in calendar. Near chip ( CF227.) In the form of "cigars" is a quartz resonator.

Also close to the processor can be detected by a microcircuit of a smart generator for 24 MHz. Little such item, but very important.

ROM.

Nand Flash memory is used as ROM MT29F32G08CBACA. (29F32G08CBACA) on 32GB (32 gig bit) In the 48-pin TSOP package. Near the board there is a landing space for another such chip - apparently for other tablet modifications. Chip manufacturer - Micron.

Similar chips are used in solid drives (SSD discs) and USB flash drives.

RAM.

"RAM" of the tablet - these are two microcircuits H5tq2g83cfr. DDR3 SDRAM memory 2GB (2 gig bit) Each. In datasheets on memory chips, memory is always indicated in bits, and not bytes! And if it is even more accurate, then in this chip 2147483648 bits. Slightly more than 2 billion bits. H5TQ2G83CFR - BGA case, that is, the chips are sealed by a belly on the feet of the solder balls.

Wi-Fi module.

Wi-Fi is responsible for a USB module of wireless communication based on the RealTek chip RTL8188CUS.

It is connected to the diagram by 6 contacts. 2 of them are a common wire (GND). Next, plus power + 3.3V and two contacts - USB interface ( USB_DP. and USB_DN.). The RF contact is connected by an antenna, which looks like a copper plate of bizarre form.

Power chains.

Power controller is responsible for food - microcircuit AXP209.. In her strapping, you can detect many inductance coils and key transistors. It happens that this microcircuit fails.

With the power controller, very unpleasant breakdowns are sometimes associated. So, when it malfunction, the tablet may not charge the built-in battery, although the charge indication can be displayed on the tablet display. The same tablet works only when the charger is connected.

Such a fault leads to the fact that the built-in lithium battery discharged to a minimum and turns off the built-in charge / discharge controller.

As a rule, the tablet is in this case goes on the shelf or in the table box, where it is lying for several months. The battery during this time is even more discharged and goes into the stage of "clinical death". If it is possible to restore such a battery, then its capacitance decreases noticeably, and sometimes after charging it just swears.

Touchscreen control.

FT5306DE4. - Controller of the capacitive touch panel. This controller is used to work with touch panels with a size of 4.3 "to 7". The FT5306DE4 main processor is associated with the I 2 C or SPI interface.

Like any tablet, RMD-825 has such elements as a vibromotor (glued with glue to the matrix), miniature speaker, microphone. Also on the board there is a connector for SD cards, connector for uSB connections Cord, access to headphones, power connector. I think it should not say that such elements like connectors, buttons and connectors most often fail.

Well, finally, let's see how the tablets do in Chinese factories. Surprisingly, how many more manual labor in this process - I thought that all the robots were still stamped :)