Cell phones DIY repair

In detail: do-it-yourself cell phones repair from a real master for the site my.housecope.com.

If you have long dreamed of learning how to repair cell phones, but have not found a worthwhile technique, then the exclusive practical video course “Do-it-yourself effective cell phone repair»Mobile repair from a real practitioner - for you. Get a step-by-step system for repairing any phone today!

The purpose of this video course is to teach you how to effectively repair any cell phones with your own hands. This is a video course that helps to solve all complex problems. cell phone repair, it does not matter whether you are a beginner or already a pro. Everyone will find the necessary knowledge for themselves. The course will help you, save more than 50% of your time looking for problems related to repairs!

Having studied the video course “Do-it-yourself effective cell phone repair»: You will learn to apply special repair techniques that have been developed over the years; You will learn how to repair the most complex phones; You will learn how to quickly find problems and fix them!

Bonuses
Diagrams of many phone models

Released: 2014
Genre: Video course

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Format: MP4
Video: MPEG4 Video (H264) 640 × 360 25fps 1998kbps
Audio: AAC 48000Hz stereo 128kbps
File size: 4.38 Gb (5% recovery)
Download | Download: R. Holodov. Do-it-yourself effective cell phone repair. Video course

You may have already heard about the video course "Effective DIY Cell Phone Repair"... This course appeared on the Internet quite recently and, to be honest, the topic the author talks about is very interesting to me.

How can this video course be useful?

If you are interested in repairing cell phones, then you probably faced a lack of knowledge and experience in this area. Not everyone has the opportunity to attend full-time training courses on cell repair, and their cost is quite high.

Video (click to play).

But today the state of affairs is changing, and you can learn how to repair cell phones on your own. For those who are not familiar with electronics for the first day, mastering the video course is not difficult. There would be time and desire.

If you are engaged in cell phone repair seriously and regularly, then in the future you can open your own workshop, since the service for the repair of mobile phones is now in great demand.

A few important points about cell phone repair.

Being engaged in paid repairs is extremely important arrange the supply of spare parts and parts for repair. I repeat, this is very important!

Let's look at an example from real life. Personal experience.

When doing a paid repair of electronics (not cellular), I ran into a problem. It consisted in the fact that there were no spare parts and parts to replace faulty ones at hand. Drive to the city for 150 km. because of some microcircuit it was expensive. Moreover, the electronics that were brought in for repair were not of the same type. What does different mean? This means that today they brought a car radio, tomorrow a TV set, and maybe a thermopot. It is clear that buying in stock the necessary parts for repairs in this case is extremely unprofitable. Especially if the number of orders is small. It is extremely difficult to use parts from the store and thereby recoup the money costs for them.

The situation is different for mobile phones. A mobile phone is a product of the same type. For the sake of interest, try to disassemble 2 - 3 phones in a monoblock type case. You will see that the construct has a certain pattern. Mobile phones at the factory are stamped by robots, and the developers only change the appearance and some functions. Otherwise, everything is the same.

Also there are certain running models... There are the most common malfunctions of these models.Repair such devices of the same type easier... All radio mechanics know this.

Those who are engaged in the repair of cell phones sometimes buy 3-5 running displays, cables, connectors, connectors for future use, so that the demanded part is always at hand! How do they know this? Of course, from my own experience.

Several years earlier, there was an acute shortage of spare parts for cell phones. Cell phone parts were difficult to find even on the major radio markets. But now the situation has changed dramatically. Almost in any large city you can find shops specializing in the sale of spare parts for cell phones, smartphones and tablets: displays, cables, connectors and others. A good example is the network of stores "Profi" and "GreenSpark". Such shops give discounts to regular customers and workshop owners!

What is also encouraging is that the prices for spare parts for cell phones have become available and in most cases, mobile repairs become economically justified.

Also, special equipment for the repair of cellular and consumables became available: fluxes, solders, solder pastes, stencils for BGA and much more that is not even always needed during the repair process.

I believe that this situation is huge plus, since the availability of spare parts for repairs is one of the most important components of success!

But, unfortunately, not everything is as great as it might seem. Based on my practice, I can say that there are a lot of outright defects among the spare parts sold by well-known chains. Therefore, I recommend that everyone who starts repairing to check the parts on the spot, keep the seals on spare parts until a full check and receipts from purchases. In many cases, sellers respond adequately to the return of defective goods, but in any case, it is necessary to know the procedure for returning the marriage.

Also forget about original parts. They simply do not exist. The original is installed in the device that you are repairing, everything that is sold is copies of different quality.

You can save good money if you buy consumables, tools and, in fact, the spare parts themselves on Aliexpress. But here it is worth understanding that delivery from China takes on average 1-2 months, and customers do not like to wait. Checked. But, such popular spare parts as microUSB connectors can be bought with a margin and not worry that they will run out at the most inopportune moment.

Will a complete "kettle" in electronics be able to master the repair of mobile phones? I just want to say: "No!", Or "More likely no than yes." In any business, it is important to know basic principles... Naturally, radio electronics also has its own basic principles that even the most stupid master needs to know.

Knowledge of electronics is highly appreciated. It is also worth noting that the author of the course "Effective DIY Cell Phone Repair" devoted the first few video lessons of his course to basic electronics components and reading circuits. In my opinion, this is a very correct approach to presenting the material. Without knowing the basics, it will be difficult to count on anything more.

Therefore, quickly master the repair of mobile phones in this course without basic knowledge, with a "jerk", rather fail. But it makes no sense to dive deeply into the circuitry of cell phones either. Most of the faults are of the same type and do not require the use of complex equipment for repairing cellular or special knowledge in circuitry.

I do not know how video decoding occurs in the processor of a DVD-player and I am only superficially familiar with the circuitry of these devices, but this does not prevent me from troubleshooting typical malfunctions of DVD-players. The minimum that may be required when mastering the course materials is experience. Also desirable is an interest in radio electronics and even a little knowledge in this topic.

Practice, practice and more practice!

Practice is very important in electronics repair, especially in electronics such as cell phones. The experience that is gained in the troubleshooting process is "Golden asset"that will work for you in the future.

Newcomers, as a rule, at first encounter difficulties, it seems to them that the repair time for one device is very long, and abnormal situations arise. But this path is passed by all the masters... The more devices pass through your hands, the more confident you will feel when repairing new, complex devices. Therefore, if you want to seriously deal with the repair of mobile phones, then think about where to get the devices on which you can at least practice, “fill your hand”, learn how to correctly and accurately disassemble / assemble the phone, solder the cable, connector, microphone, etc.

Attention to details.

A cell phone is a very technological device and should be treated with respect. When renovating, it is important to pay attention to the little things. For example, if you carelessly select a replacement display or board, you can throw money down the drain. I bought a display, replaced the broken one in the phone, but it doesn't work ?! What the . Ah, the revision is not the same. Exactly. We'll have to buy another one.

A banal and stupid situation. And all because of inattention to those little things! In a cell phone, even an unscrewed bolt can cause it to malfunction. And this is a fact.

And for a snack. How much can you earn?

Let's not "hover in the clouds" and build "castles in the air", but just roughly estimate how much you can earn by fixing, for example, 10 cell phones with simple malfunctions? The average cost of repairs, even for the most ordinary and minor malfunction, is 500 rubles. For 10 phones we will receive 5000 rubles.

Those who are engaged in the repair of mobile phones professionally and have an established flow of customers, receive income, the value of which can reach 200,000 - 300,000 rubles. per month. In this case, it is necessary to repair about 200 devices a month. This amount may well be earned by 1 master.

Commendable!

But for a beginner to create a business on the knee and earn 200,000 - 300,000 rubles. per month? Sorry, but this is fantastic. Although there is one thing ...

I have already said that I myself occasionally do paid repairs and for me even 5,000 - 10,000 rubles. from cell phone repairs would be a good start. Yes 200,000 - 300,000 rubles. a month is cool, but you need to correctly calculate your strength. At the same time, it is not necessary to open your own service center, to become an entrepreneur. For starters, you can do cell repairs at home in your free time. Many radio amateurs are engaged in paid repairs. This is an additional income and a favorite thing. And this is great!

Those who are not satisfied with what has already been achieved open additional service centers and hire an employee. Most often, they themselves teach him the basics, since the repair of cell phones in technical schools and universities is simple do not teach... Alas, this is a fact.

Do not forget that the so-called “20/80 principle” applies in any business. It is also called Pareto's law. The bottom line is that out of 100% of beginners, about 20% achieve success. The rest either quit or start doing something else. This is, of course, a rule of thumb that does not always work, but you need to understand that you have the right to fail.

You can learn how to repair cell phones and become a master, but not everyone can run a repair business.

To begin with, it is strongly recommended that you familiarize yourself with at least the basics of radio electronics. The fact is that the repair of mobile phones is closely related to theoretical knowledge in this area. For example, if you need to replace a resistor (this is a passive current-limiting radio electronic component), then you definitely need to know its labeling, resistance, power dissipation, temperature coefficient, etc. With other owls, it is not very advisable to repair mobile phones without knowing Ohm's law.There are a huge number of books and manuals on the topic of radio electronics, as well as thematic sites on the Internet. But this is not enough. Mobile phones are digital devices, not analog ones. Consequently, all parts and components used for the production of the latter have differences among themselves. For example, for analog devices, surface mounting technology is mainly used, and for digital devices, surface mounting. The latest technology is called SMT (surface mount technology). It also translates as "surface mount technology". And the components used in this technology are called SMD (surface mount device).

Also, there is no analog signal in digital electronics, because it is actually digital. Consequently, all digital devices have their own types and levels of programming. These are just a few of the differences between analog and digital technology. But even this is enough to scare a newbie away. But there is no need to despair here. Everything is much easier than it seems. A lot of that frightening information is not needed when repairing mobile devices. But if you are planning to seriously tackle this business, then it is strongly recommended to study analog and digital radio electronics.

Now we come to the main goal of this article. So, now you will be described in detail the procedures for technical repair of mobile phones and types of repair devices.

In order to repair a cell phone, including repairing Nokia, Samsung, Sony-Ericsson, LG, Motorola, the first thing is to determine the cause of the failure of the mobile device and identify the component, assembly, module or part that has failed. For this, the knowledge that is described above is just needed. Usually, the breakdown of a mobile phone is caused by improper operation or loss of functionality of external devices. For example, in the first case, the phone fell into the water by negligence. To restore it, complete disassembly and thorough drying are required. After that, you need to use a soft-bristled brush to clean the phone's printed circuit board with a special cleaning agent or 96% alcohol solution. In the second case, the LCD, speaker, microphone, keyboard, etc. are out of order. As a rule, in most cases, such parts cannot be repaired and must be replaced. But if there was damage to the surface (soldered) parts on the printed circuit board, then a professional approach and experience are required. In addition, for this type of repair, you will need a diagram of assemblies, modules and components of the printed circuit board of a mobile phone.

In order to start the repair procedure, the phone must be disassembled.

To open a mobile phone without causing cosmetic damage to it, you need to acquire special tools for opening them. They allow you to open the phone case accurately and as efficiently as possible without causing defects. As a rule, these instruments are sold in sets, each item of which is responsible for its own specific opening. Such kits are not difficult to find in specialized stores. In addition, they come in various types. The difference is the functionality and the price.

You also need a specialized set of screwdrivers for mobile phones. You don't need to save on this. The more specific number of attachments you have, the more chances you will have to unscrew the screws without breaking the edges.

Further, in order to diagnose the phone for its malfunction, you will need a good digital multimeter. It can be used to measure AC and DC voltage and current, resistance, capacitance of capacitors, coefficient of transistors, diode state, continuity of circuits, sections of circuits or nodes, temperature. With skillful use and knowledge of some physical laws, they can find faults in the circuit.The range of multimeters is enormous. The difference is usually in functionality and price.

We also need a laboratory power supply or power supply. With it, it will be possible to set the specified voltage and current. You will need it very often when carrying out repair work, because it will be inconvenient to substitute the rechargeable battery for testing, over and over again. Modern power supplies are equipped with current stabilization and protection functions, as well as a large number of all kinds of clamps and probes for various cases.

Soldering equipment and fixtures. To carry out soldering work, you need a soldering station. Their variety is infinitely large, and the choice is determined by the price and functional range. There are combined soldering stations that combine both a heating soldering iron with temperature control and a hot air dryer, which also has the function of adjusting temperature and air flow.

A hot air dryer is usually required for mounting and dismounting SMD components, as well as integrated circuits made in a BGA package.

Also, when carrying out soldering work, you will need a device for the bottom heating of printed circuit boards. The fact is that when installing or dismantling, for example, integrated circuits (chips), there is a risk of overheating and failure. When using a heating device, on which the printed circuit board of the mobile phone is placed and fixed, the board is rationally heated. And already when the board is heated, you can start assembling or disassembling components without fear of their breakage. this procedure takes place in a few seconds.

Antistatic thermo-tweezers are also useful for soldering work. It is very convenient to use it to dismantle some of the components.

Since you will be faced with soldering work on the installation / dismantling of integrated circuits, you will need a vacuum manipulator. This device is manual and automatic. It is designed to place the chips with the contact pins on the surface of the printed circuit board of the mobile device as accurately, efficiently and conveniently as possible. It is inconvenient to do this with tweezers, especially since there is a high probability of “kill” the microcircuit with an uncalculated pressure. This will never happen with a vacuum manipulator.

Also in the work you need a desoldering pump. With the help of it, you can easily perform soldering by removing the molten solder.

Optics. Parts and components of mobile phones are measured in micrometers and nanometers. It is clear that working without special magnifying devices is very problematic and harmful to vision. In these cases, it is strongly recommended to acquire a 40 diopter technical microscope (not to be confused with a biological one). You will also need a backlit tabletop magnifier. It is not convenient to work with a microscope in all cases, and a desktop magnifier is convenient to use almost always when ultra-high magnification is not required. Mounting magnifying glasses or forehead binocular glasses also do not hurt.

To carry out washing, cleaning all kinds of components and printed circuit boards from dirt, oils, fats, solder, plaque and rosin, you need an ultrasonic bath. It performs ultrasonic cleaning very efficiently and safely.

Other tool. Among other installation tools and accessories, you will need a mounting fixing table, with which you can easily and securely fix the printed circuit board for repair work. Be sure to have a variety of tweezers, mounting awls, round-nose pliers, pliers, long-nose pliers, wire cutters with you. You can add solder paste, flux, solder, rosin, cleaners, ultrasonic cleaner and other consumables to this list.

Where to get parts and components for repair? Of course, you can buy them in specialized stores, but it is best to buy broken phones. Since in some cases, it will be very problematic to find some parts, and it will not be difficult to buy, for example, a broken phone, which contains the necessary part, moreover, at a very low price.

Well, here we are with you and got acquainted with the minimum that a mobile device repair engineer should have. Of course, knowledge and experience will come with time, as theoretical and practical skills are developed. Read books on electronics, if possible, sign up for special training courses in the repair of mobile phones, communicate with people who have experience in this area, visit specialized forums on specific topics, where people are always ready to help.

In general, great success to you in your mobile phone repair business!

More information for learning self-repair of mobile phones HERE.

Let's consider one of the main reasons for the failure of a mobile phone: "various liquids hitting the board" does not turn on, a white screen or some buttons do not work. Of course, before opening the case, you need to know the cause of the breakdown. If one of the above is written, read on.

We open it, conduct a visual inspection for the presence of corrosion, dirt and other unnecessary substances.

First of all, we remove all plastic parts, in general, everything that can be removed is detached. Do not forget about the film with membrane-type keyboard buttons, we also peel it off (this is on other models, on ours the keyboard board is disconnected).

We take a cleansing liquid (such as alcohol, Kolosha gasoline, cologne), I use Isoprapanol, it does not have an unpleasant odor like Kolosha.

We take a toothbrush, who doesn't mind a new one, dip it in alcohol, and clean the board until it looks like new - especially the contacts for the display, the USB connector. Do not press hard, some components may be demolished.

We cleaned it, now we take the flux, take a brush, smear it with flux near the microcircuits (more), put the hair dryer at 325 degrees and warm up all the microcircuits in a circle and in the middle, the distance from the outlet of the tip (nozzle) of the hair dryer to the surface of the microcircuit is 1.5 cm. it is better and more economical to take a medium diameter.

We heat to such an extent that the tin melts at the components located around the perimeter (adjust the temperature to 330 degrees). Very, very neatly shake the microcircuit with a needle so that it moves a little. It is important not to wobble too much, otherwise it will slip off the contacts, and so on with all the microcircuits not glued (without compound). We also warm up the filters, in order to remove the flux, you can use an ultrasonic bath, but we will do it differently.

We pour alcohol under all the microcircuits without a compound, hold it for a little so that the alcohol has time to collect all the dirt. Now we take the hair dryer from the soldering station and blow it under the microcircuits. Blowing alcohol out from under the microcircuits in this way, we do not need it there. The temperature of the hair dryer should be for warming up, not for soldering, it is in the range from 260 to 290 degrees, depending on which station.

Done, let's move on. Now let cool and collect. If the breakage is fixed after assembly, then "Hurray, everything is ready." If, nevertheless, the white screen and non-short buttons do not work, you need to replace the filters or put jumpers, but that's another story. The most important parts that can fail after water or after a fall (impact) are filters (so-called glasses), they look like this.

You need to do the same with them as with the rest of the microcircuits, only solder these places more carefully. Warm up, stir, about the flux (do not forget to apply) with it, the components will not get off the contacts. Now everything seems to be. What we have done only applies to breakage due to moisture getting inside the phone. Other breakdowns, such as "does not charge" or "the network does not catch" - this cannot be fixed, components will need to be replaced. More about this in future publications.Best regards, OPA.

Using the Samsung U600 cell phone as an example, we will consider the most common breakdowns of these phone models. After a while, most of the phones of this model showed the following defect: the cable connecting the two parts of the slider was frayed. As a result, the image on the screen disappeared or just ripples appeared on the screen. Another defect: problems with touch buttons.

After some time, the camera stopped turning on and it became impossible to view photos in large size. In this state, he had to arrive for three years, until finally my hands reached him.

To repair my U600 phone I needed:

Screwdriver Set,
sharp knife
tweezers,
flex cable Samsung U600 connecting two parts of the phone.

In order not to loose the bolts, you can use a magnet. In my case, I only managed to buy a loop, although in a worse scenario I would have to buy a loop with touch buttons as well, but I managed to bring it back to life.

Recharge the battery before you start repairing your cell phone. After you have recharged the battery, remove the back cover and take out the battery.

Do not forget about one more important point when repairing phones, which is often talked about by masters, this is static electricity. They say that because of it, the failure of some elements of the phone is possible. And in order not to buy a static bracelet, we will recall the physics course and before disassembling the phone it is better to do a wet cleaning in the room, that is, to wash the floors and wipe the table on which the repair will be carried out with a damp cloth. At the same time, there should be no visible traces of water on the table. Such a procedure should be carried out after a while during the entire repair and you can not worry about static electricity.

We take the knife further and carefully pry off the cover under which the bolt is hidden. The master who repaired this phone for the first time unfortunately damaged the cover.
And unscrew the bolt.

Then we unscrew 4 more bolts holding the phone case. And taking hold of the part of the body in the area of the flashlight, remove it.

The next step is to remove another cover from the end of the case, also prying it off with a knife.

And we unscrew the two bolts located at the edges and remove this part of the phone case.

Now we unscrew the six bolts that hold the case with the keyboard.

Disconnect the cable going to the keyboard and microphone by lifting the clamp that holds it and using tweezers to remove it from the connector on both sides.

Now we carefully take out the board and turn it over, where we can see the unfortunate loop due to which the phone's display did not work. With a knife, slowly from the side of the board, we pry the cable over the case with connectors. In no case should you remove it by prying it by the cable itself, since the case with contacts can come off the cable, and if the cable was new, it will become unusable. Having disconnected the ribbon cable, you can safely remove the board and the part of the case on which it was installed by pulling the ribbon cable through the hole.

Next, unscrew two more bolts on the other part of the phone case and move the metal part of the case as shown in the figure.

Now we remove the cable from the connector marked with number 2.

This disassembly of the phone Samsung U600 has finished the next step of the phone repair.

The assembly of the phone is carried out in reverse order, with minor nuances. Install a new ribbon cable in connector 2 and fix it with a latch. Now we take a part of the phone case, on which the sliding mechanism is installed, and by placing it vertically, we install the power button of the phone in its place. Holding this part of the case in the same position, take the second part, push the cable into the opening and align both parts of the phone case. In order for them to come together, you need to move the slider mechanism a little to the side. When both parts are aligned, tighten the two bolts.
The part of the phone with the display is assembled, we take the part of the case with the keyboard and push the cable through the hole in this part of the case.
We install the board on which the sim card is located and connect our cable from another part of the phone and the cable from the keyboard and speaker to it.
We tighten the body with six bolts to the sliding mechanism.
Install the lower part of the phone case and twist it. Then we install a decorative plug from the end.
We install the last part of the phone case in place and screw it on.
We install the SIM card battery and check the phone. If all the work is done correctly, the phone will work without problems.

"I do it myself - I'll tell you how to do it for you!"

How to repair a cell phone with your own hands?

Sometimes it makes sense to have your old phone repaired rather than buying a brand new one. After all, today it is not difficult to order the required spare parts for the phone, and then flash the mobile device and buy a battery. In this case, the phone will look like new.

And it is not necessary to contact a service center specializing in cell phone repair. You can repair the equipment yourself using thin tweezers. This is not always true. To do this, you need to be well versed in the intricacies of cell phone repair and have some experience in this. Even in the service center, no one can guarantee you that after replacing the components, you can take home your device, which works smoothly and correctly. Sometimes you may be offered a phone that refuses to turn on at all.

Also, be extremely careful when buying accessories for mobile phones. Check if these items work and look at the cost - if the price is very low, then they may have been stolen. And then you can find yourself such problems with the local regional department that the phone will not bore you at all.

Most people already cannot imagine life without their favorite mobile device. After all, if a cell phone breaks down, it is already difficult to enter the rhythm of life without an alarm clock, converter, organizer and other necessary applications.

If you take your device to a service center for warranty repair, then, in principle, you are obliged to issue a replacement for a broken device, but the truth is not all organizations adhere to this. Below we will consider some tips on how to quickly, efficiently and without extra financial costs to repair your cellular device.

Actually, the list of malfunctions of mobile devices is not very long, and it also lends itself to some classification. For example, a couple of years ago, the main problem for cell phone users was blocking, which is set by the telecom operator and does not allow the device to work on other networks. Today, the most popular problem, due to which users go to mobile phone repair shops, is the change of software.

When you choose a workshop to repair your phone, then pay special attention to the rules of the item, as well as the price list of the work that is performed. See to it that the timing of the repair work is kept to a minimum, up to several days. There must be a guarantee for a period of 6 months for subsequent repairs, if any. Pay attention also to what details the service will use. Whether it will be parts with a certificate or just analogs.

Most good workshops have free diagnostics of phones only on condition of subsequent repair work. If the work is not carried out, then the consultation will be paid - 150-300 rubles. Payment must be made not before the execution of the order, but after it has actually been completed. Or pay no more than 30% of the cost as an advance payment. And if you are going to replace the repaired device with a new working one, then, most likely, the cost of the new device will not exceed the cost of your order.

Some service centers may not take their responsibilities seriously enough, taking advantage of the fact that customers often do not know their consumer rights. To prevent this from happening to you, remember some rules.

When you draw up the repair work of your phone, be sure to see that the employee writes down the essence of the problem on the receipt. It is also very important that specialists disassemble your cell phone in your presence. After all, if there is a corrosive formation or other defects in the apparatus, then they must be entered into the receipt. If you signed the document, then you automatically agreed that all defects and damages not written in the receipt were purchased by you before handing over the phone for repair.