What the controller in the phone is responsible for. ADP3408 Cellular Phone Power Management Controller. Smartphone won't turn on after flashing or updating

The power controller is one of the important microcircuits of any phone, without which you simply cannot turn on the device. Regardless of the complexity of the breakdown, it is not recommended to carry out repair work on your own; it is best to contact a specialized workshop. Re: Store Service Center has been replacing phone power controllers since 2009. All work is carried out by highly qualified professionals with a guarantee for a period of 1 to 6 months. Don't know who to ask for help? Our service center is the best choice!

The main reasons for the breakdown of the power controller:

  • Mechanical damage to the integrity as a result of falls and impacts.
  • Incorrect operation.
  • Liquid and dirt penetration into the device, high humidity.
  • Voltage drop in the network.
  • Using non-original power supplies.

Signs that an urgent repair of the phone's power controller is needed:

  • The smartphone won't charge.
  • Self-powered shutdown or reboot of the device.
  • Liquid, dirt, dust getting into the smartphone.
  • The computer does not detect the phone when connected.
  • The device does not turn on.

Is it realistic to determine the malfunction yourself?

If you do not have a special tool, you do not have professional skills and experience in the repair of mobile equipment, then the chance to determine the real cause of the breakdown is minimized. In 60% of cases, customers of the Re: Store service center tried to disassemble the device on their own in order to find out the cause of the malfunction. This method of solving the problem is incorrect and very dangerous, because you run the risk of aggravating the situation, which will greatly complicate its further repair.

The sequence of replacing the smartphone power controller

  • You deliver the device to one of the branches of our service center.
  • Hardware and software diagnostics are carried out to identify smartphone malfunctions.
  • The manager agrees with you the cost and terms of the repair.
  • We are replacing the power controller.
  • We inform you about the readiness of the smartphone using an SMS message.
  • You pick up the finished device along with your sales receipt and warranty card.

Benefits of the Re: Store service center:

Our service center is equipped with modern professional equipment, which will allow us to carry out repair work of any level of complexity. Free diagnostics will reveal any type of malfunction, technical or software. Have you decided on a service center yet? By contacting us, we will be able to restore the performance and attractive appearance of your device. You can leave a request for repairs by calling any of the numbers indicated on our website.

  • The masters of our service center have vast experience and practical skills in the field of restoring the functionality of smartphones.
  • We give preference to modern equipment.
  • The minimum terms for completing the assigned tasks. In 80% of cases, we carry out restoration work in just 1-2 days!
  • 100% guarantee of the quality of work performed and components.
  • Service of mobile devices of various models, regardless of the complexity of the situation.
  • Free diagnostics.
  • Availability of courier delivery.
  • Restoration work is carried out in strict accordance with the regulations of the manufacturing companies.
  • The lowest prices and the best pricing policy!

Equipment: mounting hair dryer, digital oscilloscope, meters, tweezers, plastic spatula, trinocular microscope, professional screwdriver set, soldering station, laboratory power supply.

Components: original spare parts, as well as their quality counterparts.

Timing: 2-3 days (depending on the severity of the breakdown and the features of the model).

Guarantee: 6 months.

Prices for repairing the phone's power controller are presented in the table:

* Indicated prices are indicative, to find out the exact cost of repairs, select your phone model in the top menu of the site

A very common defect cell phones and other digital mobile devices "does not turn on". Note that this is the most insidious defect, which does not allow us to immediately objectively assess the prospects for restoring a device that does not turn on.

The device may not turn on due to a discharged battery, but if you still tried to charge the device and this did not give the desired result, then the matter is most likely in a power circuit malfunction. Of course, in this case, the malfunction can be caused by a number of other reasons.

Most often, this malfunction is caused by a failure power controller- a microcircuit responsible for the distribution and consumption of power supply. Most often, the controller is a BGA chip, which is a key element of a digital device.

Reasons for failure of the power controller

This problem is most often the result of mechanical damage. There are also options for its failure as a result of liquid entering the product. In any of these cases, replacement of this component is required. Replacing a BGA chip is a difficult and responsible process that is beyond the power of amateurs. It should be especially noted that the professionalism of the person who changes cell phone power controller or any other digital device, the further operability of the device directly depends. This process requires not only professionalism and endurance, but also huge practical skills in replacing BGA chips.

Repair of power controllers

This technological operation is performed by highly qualified service engineers. You will receive a quality guarantee for the work performed and replaced components, which will allow you to evaluate the quality of the work performed and test your device under the conditions of daily use.

Be aware that a service center that carries out hardware repair at the level of replacement and rolling of BGA chips is worthy of sincere respect. For example, in authorized (branded) service centers, they try not to carry out this type of repair, changing, if necessary, the motherboards of the devices entirely.

Recently I found one interesting article about diagnostics of phones and tablets, I copy it as it was written. Maybe someone will help. Written by Dmitry Nechaev. Dear members of the group, I will take the liberty of writing a small instruction on the initial diagnostics of phones and tablets. So that beginners improve their knowledge, and experienced comrades do not grind their teeth when reading the posts of other participants asking for help. This post does not claim scientific accuracy, there are special cases. With this post, I do not pursue the goal of embracing the immense, I want to convey the basics and initial actions with a faulty device. Explanations for the diagram: Power IC - microcircuit / power controller (CP). RF PA - Radio Frequency Power Amplifier. PWR - power button. Vcore - processor supply voltage (0.7 ÷ 1.1 V). Vdig - power supply for digital nodes (1.8 V). Vana - power supply for analog circuits (2.8 V). Power management scheme. The power control circuit consists of 2 parts: 1. Primary power circuit (PDC); 2. Secondary power supply circuit (VTsP). Primary power supply circuit. PCP is ALWAYS energized and suffers the most from water. The current consumed by the PDA must be equal to 0. Diagnostics of the PDA. We take a laboratory power supply unit (LBP) with digital current indication. We set 4.3 V on the LBP (maximum battery voltage). We connect the LBP to the phone instead of the battery and see what current it consumes. 1. If the current = 0, then the PDS is operational. 2. If the current is large (> 1 A), then there is a short circuit (short circuit) in the PCP, usually an RF PA (Radio Frequency Power Amplifier) ​​microcircuit. This is possible in any phone other than Apple (in the iPhone, RF PA is powered through a PWM converter, which starts working only after the phone is turned on). 3. Current = 800 ÷ 900 mA ---- additional diagnostics required. One of the microcircuits is faulty or a capacitor is broken. 4. Current 130 ÷ 160 mA and this is Apple --- RF PA failure in iPhone. 5. Current from 5 ÷ 50 mA. 5.1 Water in the primary circuit. 5.2 Firmware Enters programming mode and consumes current. Secondary supply circuit. To start the TDC, you must press the power button. Power IC starts to generate 3 BASIC voltages: 1. Vcore. 2. Vdig. 3. Vana. The processor generates a confirmation signal to turn on the Power IC and starts loading the firmware from the memory. If it turns out to execute the firmware, then the phone will turn on. If the firmware fails, the processor removes the power-on confirmation signal and the Power IC turns off. Diagnostics of VTsP. We connect the LBP to the phone instead of the battery. Current = 0, because PCP is working properly. Press the power button. 1. Current from 5 ÷ 200 mA and drops to 0 --- firmware. 2. The current is from 300 ÷ 500 mA and drops when the power button is released --- something burned out in the TDC, additional diagnostics are needed. 3. Current from 500 ÷ 900 mA --- either the Power IC outputs or the capacitors are out of order. 4. When you press the power button, nothing happens --- try FAST pressing the power button. If the current appears, then the matter is in the firmware. Search for a broken capacitor. You need to find a power microcircuit on the board. There is a clock quartz resonator (2 legs) next to it. The KP is surrounded by a bunch of large capacitors and PWM coils. We take a multimeter, put it in the dialing mode and check all the capacitors around the power microcircuit (negative probe "common (ground)", positive in turn for each contact of the capacitor). After finding the closed capacitor (s), you need to find a positive contact at this capacitor. We transfer the multimeter to the resistance measurement mode and measure the resistance of the "ringing" capacitor relative to the "common (ground)". On one contact of the capacitor, the resistance will be 0, and on the other 0.5 ÷ 3 ohms (this is the positive contact). We solder it with a thin wire to the positive capacitor, set it to 1 V on the LBP. Connect the plus to the soldered wire, and the minus to the "common (ground)" and look at the consumption. 1. Current< 1 А --- ищем греющуюся микросхему. 2. Ток >1 A --- looking for a heating capacitor. You can search using the check tape or using Freezer. If there is a circuit, let's see what kind of capacitor it is. If the capacitor is parallel to the "ground", then we solder it (you can not replace it, just evaporate it) and look at the consumption. If current = 0, then we have found a closed capacitor. You can try to start the phone. You cannot simply evaporate the capacitors of the radio unit, most of the capacitors of the radio unit are in series. But, as a rule, they are not in the KZ. P.S. Please do not rush with spoiled products)) Corrections, additions and constructive criticism are welcome!

What is a power controller? This article will focus on a small part of your gadget, such as a mobile phone or tablet. Technologies have not stood still for a long time, so various failures can arise, it would seem, for unknown reasons.

What it is?

This is a very small IC that is soldered to the board of your mobile phone, usually next to the charging connector. What is a power controller for?

It regulates the process of supplying electric current to the battery of your mobile device and, as a rule, is technological enough to determine, for example, that your phone is already fully charged. In this case, the process of supplying energy simply stops, and an inscription appears on the display of the smartphone, which informs that the battery of your device is charged. Perhaps it also protects your device from higher voltage chargers, preventing your smartphone from breaking down.

The power controller in the phone is broken, how to check?

If your mobile phone suddenly stops charging or the battery lasts only a few hours, then most likely the reason is precisely this problem. In principle, there are not so many options for checking. You can try to charge the phone for a little longer than usual, or completely discharge and charge the battery. If the breakdown is serious, then, most likely, such actions will not lead to anything, and the phone, sooner or later, will simply refuse to turn on.

There is also an option when the smartphone starts to constantly reboot - this is again the fault of the power controller. In this case, there can be a lot of reboot cycles - until the battery is discharged. However, there may be other reasons for this behavior of your gadget.

Other breakdowns

Your phone's strange behavior may be due to another malfunction. Reboots and shutdowns are not necessarily a failed power controller. The battery could be the culprit.

However, everything is a little simpler here. In the case of a battery, the first step is to check for signs of damage or, for example, excessive overheating. If you have a monolithic battery (like in an Iphone), then it is better to contact a service center.

If you can pull out and inspect the battery (there is such a technical possibility) and it has visible signs of damage: swelling, concavity, etc.), then it is better to try to replace it under warranty or buy a new one, depending on your situation.

About self-repair

It doesn't matter what is broken in your phone: battery or power controller, it is strongly not recommended to make repairs yourself. It is better to walk to the nearest service center and let the professionals solve the problem. Self-repair most often leads to a complete failure of the smartphone.

Indeed, for its implementation, a special tool is required, possibly additional parts (the same power controller, only a new one) and many other parts.

How to extend the service life?

Having figured out what a power controller is, you can give several useful, albeit not new, recommendations on how to prolong the operation of your gadget.

The most important thing is not to use chargers from other manufacturers. Despite the fact that they say all around that such a replacement is safe, it is better not to risk it again. A small difference in voltage, which can be caused by anything, including different materials from the device manufacturers, can damage both the power controller and the battery.

As for the device itself, apart from chargers, it is better not to use batteries from other gadgets. Of course, the era of counterfeit batteries is practically over, but compatible devices may remain.

Well, the last, quite logical advice - avoid moisture. If your device is not protected from water, then it is better not to wet it again.

Outcomes

Now you can answer the question: "The power controller in the phone - what is it?" However, do not try to repair this part yourself. Without the necessary experience and tools, this will most likely break your smartphone. It is better to contact a special repair shop, where they have experience working with similar breakdowns.

In addition, if you notice such signs as, for example, frequent reboots with a full battery, fast discharge, and the fact that your smartphone does not see the charger, this is again an excuse to take the phone to the masters.

And then thoughts scatter at once. The fact is that the cause of this malfunction can be either a trifle, such as a discharged phone battery, or very serious damage to both the software part and the phone board. Or even damage incompatible with maintainability. Diagnostics of this malfunction can be as easy as it is very time consuming and extensive. Each master has his own algorithm (sequence) for carrying out verification operations and control measurements. Someone immediately climbs into the jungle (for example, flood the entire board with flux and solder all the chips, or start flashing the phone at a run). The main thing is to understand how to distinguish software from hardware faults.

Any diagnostics should start with checking the power supply. If you plan to turn on the phone for testing from a standard battery, you need to measure the charge level. It must be at least 3.6V. If the battery is discharged, it must be charged to the required level using the standard method (if the current state of the phone allows it) or using a universal charger. It is preferable to use a power supply unit for powering the phone, which provides at least 4V output voltage with an indicator of the consumed current. For more information on choosing a power supply unit and a Universal Charger, see the equipment and materials section.

Having set the required power supply voltage, respecting the polarity, we connect the crocodile clips to the contact terminals of the phone battery:

Without pressing the power button, we immediately look at the arrow of the ammeter of the power supply. If it is indestructible at the initial (zero) position or deviated slightly and immediately returned to its original position (there was a process of charging the capacitors to power the phone), then everything is in order in the primary power supply circuits of the phone. This means that there is no short circuit and increased consumption in the off state and you can try to turn on the phone with the power button.

If the needle of the ammeter deviates noticeably and shows not very large consumption (tens of milliamperes), this indicates, most often, that moisture has entered the inside of the phone. Moreover, this does not have to be complete or partial flooding of the phone with liquid. Sometimes it is enough to talk on the phone in the rain or pick up the phone with wet hands. Learn more about diagnosing phones after moisture exposure.

In the case of high consumption (hundreds of milliamperes, and more often 0.5 Amperes and above - up to the maximum possible), this is a clear sign of a short circuit in the primary supply circuits (battery circuit). As a rule, with such consumption, the "culprit" immediately heats up to a high temperature (barely holding the finger or not holding it at all). This fact helps well to find the malfunction. In 99% of cases, it is the faulty element that heats up. ATTENTION! Such a high percentage is typical for elements in the primary supply circuits. For elements in secondary power circuits, other features!

In the primary, as a rule, GSM Power Amplifiers, power controllers, power converters (just for secondary power circuits), display and keyboard backlight power converters, memory card power converters, cameras, sound power amplifiers, separate battery charge controllers and separate capacitors parallel to the power supply. According to my statistics, all of the listed elements, except for the GSM Power Amplifier, fail in 90% of cases again due to exposure to moisture! As for amplifiers, they like to whitewash after drops and bumps of the phone. It is much less common.

With normal ammeter readings, press the power button and look at the consumption again.

It should be remembered that for the normal switching on of NOKIA phones from the power supply, it is necessary to connect the middle contact of the battery connector to the negative one (see the photo above!).

Under normal conditions, switching on occurs with the simultaneous execution of several operations (starting of secondary power supplies, initialization and software execution, self-test, etc.). At the same time, the ammeter readings very quickly fluctuate within 30 - 50mA until the phone's backlight and other modules are activated. Consumption rises to 100 - 300mA (for different phones in different ways; mainly for phones with large color displays). As soon as the phone is registered in the network, the consumption can grow up to 400mA for a short time. Learn more about the current consumption in different modes.

We press the power button, but there is no result - the ammeter needle stands dead in place. There are several reasons:

1. The power button is faulty... We find the power button on the phone's board and, depending on its design, proceed as follows:

If the button is made separately from the rest of the keyboard and, as a rule, is placed on the top or side edge of the phone and has a body of this type

then we check the functionality of the button by pressing and simultaneously measuring the resistance. It happens that over time, the internal contacts of the button oxidize or wear out and, accordingly, such a button, when pressed, gives a large resistance instead of a good circuit. If the button is normal, we check the quality of the soldering of the contact pins on the board. Sometimes the violation of soldering can be seen with the naked eye, and sometimes there are imperceptible microcracks that instantly oxidize and contact is almost impossible;

If the button is made on a common keyboard matrix under an elastic adhesive film that holds springy steel plates - membranes (round or elongated) strictly in place

then carefully peel off the film with buttons and examine the surface of the contact pads of the button on the board and steel round membranes for the presence of oxides. If there are any, they must be removed. This is best done with an eraser - a pencil and brush or a regular eraser.

2. The circuits of the power button are faulty... The phone's power button is most often associated with the power controller through board interlayers. Often in these circuits there are discrete elements (resistors, varistors, capacitors), which are in close proximity to the power button, although the exact location must be viewed according to the diagram. If the track that connects the power button to the power controller is cut, the phone will not turn on. This mainly happens when the phone is dropped. At the moment of impact, the board and all elements of the phone experience a strong overload. Soldering problems occur, especially for large BGA chips. In such cases, soldering of these chips or complete dismantling with rolling (reball) of the terminals and subsequent installation helps. Sometimes impacts are accompanied by breaks of contact pads and board tracks. In such cases, the board should be replaced with a new one.

As for discrete elements. If there is a resistor in series in the switching circuit, it is worth checking its presence and the integrity of the soldering. Sometimes they come off at the moment of impact, but most often they are torn off by the users themselves, when they begin to press the power button with addiction and it will certainly come off and demolish everything in its path. Or the torn off button falls out of the phone case and "advanced" users start turning on the phone by closing the contact pads with the help of improvised means (the tip of a knife, scissors, etc.). Accordingly, both the elements and the board suffer.

In addition to resistors, varistors and capacitors are common culprits. Only if they fail, another, completely opposite defect appears - the phone itself turns on when power is applied or as soon as the battery is inserted, since the varistor and capacitor are parallel to the power button. When moisture gets into the phone, these elements (especially typical for a varistor) begin to shorten. The phone perceives this as pressing a button.

Do not forget about phones - clamshells, sliders and the like. If the power button is not on the main board, the same board-to-board loop may be to blame. This defect occurs quite often and is eliminated by replacing the loop.

Checking the circuits of the power button is checked by a continuity tester or by measuring the voltage at the contacts of the power button. When the control panel is in good working order, the voltage of the power button of most cell phones is about 4V. For Siemens phones of the C65, CX65 series and the like, the voltage of the power button is about 1.95V.

3. Defective power controller or violation of its soldering... Failure of the gearbox is a rather rare case. Usually, in such cases, the consumption, on the contrary, is very high and is accompanied by a characteristic heating of the chip. Malfunctioning soldering is much more common. As mentioned above, soldering or rolling of the BGA chip helps.

If the voltage on the power button is present, but there is no reaction to pressing it, you should use an oscilloscope to check the generation of the clock generator built into the power controller (or processor) with a frequency of 32 kHz. The diagram is depicted as follows:

On the phone board, the quartz resonator looks like this:

Case execution of quartz is varied. In addition to what is indicated in the photo, the phones also contain:

These elements are quite fragile and, when the phone falls, they often collapse, although outwardly they look completely intact.

By setting the appropriate parameters of the oscilloscope (TIME / DIV = 20uS, V / DIV = 500mV), we measure the generation. On the oscilloscope screen, we should see the following signal:

In the absence of this signal, it can be assumed that the quartz resonator is faulty and must be replaced. However, before replacing, it is necessary to make sure that there is a constant supply voltage of the quartz, as a rule, 0.3 - 0.5V. Otherwise, it is necessary to solder / replace the power controller (processor).

4. Defective secondary power supplies- power supply of the processor, memory and stop. devices. In simpler phones, these supply voltages (2.8V, 1.8, etc.) are implemented using the same power controller. In more complex (smartphones), with several processors and types of memory, as well as a variety of built-in devices, secondary power supplies are made in the form of separate (most often pulse) DC / DC converters. The most common breakdown is failure due to moisture ingress. Less often - blows and short circuits. They are checked by careful visual inspection and measurement of the corresponding voltages according to the diagram.

Examples of secondary power supplies:

These fragments of the diagrams indicate the input voltage VBAT (power supply voltage of the telephone battery) and the output voltage - VCORE, VDDR_APE, VIO.

5. Malfunctions of the mobile phone software... If, when the power button is pressed, the consumption of the phone rises to 20-30mA and immediately drops and no more action occurs, then we can assume that the malfunction lies in the malfunction of the phone software. This fact is carefully verified by testing or restoring the software part using the programmer.