It was decided to disassemble a very familiar tablet from an online auction () to look at the hardware. These kinds of tablets are very easy to disassemble, you don’t need any tools, your own nails will suffice. The two main parts of the case are joined with latches; more expensive models with a metal back cover use screws. After undocking the two main parts, a beautiful view opens up to the inside of the Chinese tablet for $50.
Despite the fairly high performance of the processor, it is without cooling, there is not even a primitive heat sink, I generally keep quiet about the Peltier element, which is actively used by many manufacturers. Oddly enough, the processor works fine, although it gets so hot that you can boil water on it.
The battery is lithium-ion with a capacity of 1800 mA/h according to the passport, in reality it is as much as 2000 mA/h.
An extra 200mA cannot extend the battery life of the tablet by 5-10 minutes, which is quite a lot! The battery itself has a charge controller that does not allow the battery to be recharged and discharged below the permissible limit, so even a completely discharged battery is charged when charging is connected, but in some models this controller is missing, it is for this reason that a completely discharged tablet will not charge, and will need to be disassembled to charge case and charge the battery separately.
Camera - 0.3 MP passport, 1.3 in real life. During video calls, this difference will not be noticeable, but the extra megapixel is very useful when you don’t have a device at hand, but you need to take a couple of photos for memory.
Typically, this kind of malfunction can be solved in one way - by replacing the tablet software, or flashing. And here it would seem that everything is simple, but we know little about the tablet. That's why it is nameless, because it is impossible to find any information by its name. Therefore, the first step is to determine what processor does this device run on?. To do this you will have to climb inside the tablet.
The designs of tablets can be very different, so here we can limit ourselves to only general recommendations for disassembly.
When the tablet case is opened, determine the processor model. Most often, the processor is the largest chip on the motherboard of a tablet computer. For example, in this photo the processor model WM8850(position 1). This is a fairly common inexpensive chip in Chinese tablets.
You may also need to know the touchscreen controller model because... sometimes after installation it may turn out that the tablet boots up and works, but the touchscreen does not. In the photo the controller (position 2) is called EKTF2127. This is also a fairly common chip. Typically, the touchscreen controller is located not far from the cable that connects the touchscreen to the motherboard.
Also look at large inscriptions on the motherboard, not related to any specific element (position 3). Perhaps this will be the board version, its number, or even the name of the manufacturer. This information will make it easier for you to find the firmware you need.
An important parameter is also screen size and resolution, if you remember.
In general, you need to collect as many characteristic features of your “anonymous” tablet as possible. This set of features is like fingerprints, by which one can establish his “personality”.
Android tablets usually support several flashing options:
The most suitable option in our case is update using bootable microSD card. To do this, you need to find the appropriate firmware, load it onto the memory card, reboot the tablet and wait until the operating system is installed. The functionality or malfunction of the tablet depends on how successfully you can find the firmware.
Type a query in the search engine with all the data that you found for your tablet. For example, for the case under consideration, the request could be like this: w70 WM8850 firmware And the very first links in the Yandex results lead us to the desired result.
Read these sites, look for what is most suitable for your Chinese tablet. Typically, such thematic forums provide detailed sequential descriptions of the process of updating the software of various devices and provide multiple links to firmware, both official (factory) and unofficial (developed by enthusiasts).
When loading inappropriate firmware onto a tablet, there is a risk of turning the tablet into an inoperable, useless “brick”. Reflash your tablet at your own risk or contact a service center.
Today we are using tablet computers more and more. The main quality of such a device can confidently be called its mobility - the user is not tied to his workplace and can stay in touch as long as necessary, and at the same time constantly be aware of all important events. Today, everyone uses a tablet to their own taste, for some it’s just a stylish accessory, some like to read a lot, some need it for meetings and presentations, and some just listen to music or watch movies. The compactness and lightness of this device allows it to be used even in the school curriculum. More and more parents are replacing regular heavy textbooks with compact tablets with electronic versions of books. Of course, many are curious about what is inside this device. This is exactly what we want to tell you about in this article.
The most important components of a tablet computer are:
Touch screen is an information input device that responds to touch and allows the user to “communicate” with his device in a language he understands. The advent of touch screens in mobile devices made it possible to remove the conventional mechanical keyboard and make a huge display, as well as simplify surfing the Internet and greatly expand the multimedia capabilities of the device.
But there are also inconveniences. The touch screen consists of the touch panel itself, a cable for connecting to the system board and protective glass, which makes the sensor a very fragile spare part, which is why touch screens often need to be repaired or replaced. To ensure the strength of the touch screen, our store offers additional tempered protective glass, which will take the full impact if the device falls. The additional protective glass will most likely break, but in any case, it is easier and cheaper to replace than a touch screen, and you won’t have to disassemble the tablet. In case your touch screen is cracked, we offer touch screens for most tablets of well-known brands, such as Acer, Apple, Asus, Fly, Lenovo, Samsung, Sony, as well as a huge selection of touch screens for Chinese-made tablets China-Tablet PC, and other models.
If you have any questions about replacing the touch screen, we recommend reading our article
Typically, the touch screen is attached to the tablet in two ways - either with double-sided tape to a plastic frame, or with ultraviolet glue directly to the display. We offer a wide selection of high-quality adhesives, selected specifically for gluing touch screens, as well as adhesives that harden under ultraviolet radiation. By the way, we made a whole video about adhesives, which you can watch here:
Today it is simply impossible to imagine a modern gadget without cameras. Tablet manufacturers usually use 2 cameras. The main camera is designed for high-quality video shooting, and, as a rule, has high resolution and all sorts of elements for image stabilization. The front (front) camera looks directly at you, and is mainly used for video communication; it has a low resolution for comfortable signal transmission over mobile networks. The front camera, and sometimes the main one, is attached to a plastic frame, which partially serves as the front panel of the tablet body.
If the touch screen is an input device, then display - output device. It displays information in graphical form in a format that is understandable to humans. The higher the display resolution, the clearer the picture will be.
The most common display failure will always remain mechanical damage, in other words, a broken display. If you have such a problem, we are always happy to help you. Our store offers a large selection of displays for tablets in different configurations, separate displays, displays complete with touch screens, and also complete with a frame.
The “skeleton” to which all components of any mobile device are connected is motherboard. This is a complex multilayer dielectric plate, on the surface and in the inner layers of which conductive circuits of an electrical circuit are located. The motherboard contains many electronic components, connectors for mechanical connections to other parts of the device, and a user interface by soldering.
On the other side of the motherboard, various electrical elements, microcircuits and connectors are soldered for connecting a display, touch screen and cameras. A microcircuit, in other words, an integrated circuit or chip (microchip) is a miniature electronic circuit made on a semiconductor substrate or film, most often placed in a non-separable housing.
Tablets that support mobile communications also have a power amplifier, and in more expensive versions the tablets are equipped with video processors.
The mobility of this entire complex device is ensured, of course, accumulator battery.
They brought me a non-working tablet after another repairman, which, as the owner was told, should be thrown away since it cannot be repaired. The tablet's micro USB connector for charging and data transfer was broken, and of course, it did not turn on at all.
The device itself does not have any inscriptions or signs on the case; only when turned on, as it turned out later, it was possible to recognize that it was a Samsung Tab-7. True, I doubt that this is an original due to its design; I am more inclined that it is a cheap Chinese counterfeit. So we will restore it.
The previous repairman ruined the device even worse than it was before it was repaired - he somehow broke out the glass that covered the camera, scratched the sides of the tablet case, since he opened it with no one knows what, and also screwed up a bunch of short circuits on the board near the connector, and so on. I didn’t screw the motherboard on, but just left it hanging on the cables.
I completely unscrewed and inspected it, unsoldered the connector, since checking the tester showed that the power was shorting to ground, and the signal lines had an abnormally low resistance.
I fixed all the power problems, disconnected the battery, and checked it too - the controller was hopelessly dead, but there were still doubts about the bank.
I temporarily threw in my small battery bank, tried to start it - something started to work, but at the boot stage the device went into a boot loop (Boot Loop) - this was not at all normal, since according to the instrument readings, the problem was no longer the power supply.
The solution was as follows: use the hardware keys to enter Recovery, which turned out to be standard, and perform all the wipes, then a complete reset and another cache wipe. I check - we exit recovery and the device starts successfully on my miracle battery.
And during all the time that the device was being repaired here, the battery of the tablet bank, which I had thrown in to charge, had already come to life a little. I checked the start from it - it starts, well, we are looking for a suitable controller at hand - we pick out the Nokia battery (the can is swollen) and unsolder the original and durable contact, having estimated the circuit, we make and solder the necessary pins on the controller board, check - the controller will not come out nothing, which means you need to make the first start by short-circuiting the minus in a bypass to the input circuit, carefully using tweezers. Now the controller knows that it has a bank connected and can be soldered to the load - the tablet.
Everything works when tested and the charge is the same, we check the temperature of the controller elements on the motherboard itself, the stability of operation and charging of the can, then we pack and insulate the controller well (I used high-quality white electrical tape), the Chinese thin yellow tape does not inspire confidence, we further assemble the device, charge , we test it with a special program - everything works great.
And now we are giving it to the owner, who did not even hope that this device could be used for a long time. The renovation was carried out by redmoon.
