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Checking and detecting power failures in phones - phone maintenance (mobile)

Diagnose consumption and leakage malfunctions in the mobile phone on the 4all-here platform for science and technology, where we monitor for you everything new in the world of science and technology.

Many maintenance technicians, specifically phone maintenance, face some problems related to diagnosing and identifying malfunctions of the devices received in the maintenance shop, which are accompanied by the customer’s complaint “the battery runs out quickly.”

The malfunction may be due to the battery, visible malfunctions such as humidification or salting, or common malfunctions.

Checking and detecting power failures in phones - phone maintenance (mobile)
Checking and detecting power failures in phones - phone maintenance (mobile)

Power consumption in the mobile phone:

It is the value of the energy consumed by the mobile from the battery during the operation of the mobile phone.

We can measure the power consumption of the mobile phone using the power supply after pressing the power button.

  • On average, it is between 0.18 to 0.45 mA, and therefore when we see these values, this mobile works normally.
  • Sometimes during the start-up process, these values ​​rise and can reach “1.0” amperes.
  • In order for the mobile consumption to be calculated accurately, the mobile must wait until it automatically enters the sleep mode, or what is called “Sleep Mode”.
  • After the device enters this mode, we can wait for a period of up to a minute and we will find that the ampere indicator has returned to zero, thus making sure that the consumption of the phone is normal.
  • If the mobile continues to draw the ampere while entering the “Sleep Mode” mode, this means that the mobile consumes more battery than the normal rate of consumption, and here we will notice that the customer’s complaint “the mobile gets charging quickly.”

Diagnose consumption and leakage malfunctions when maintaining the phone (mobile)

But we have to pay attention to an important note that helps us to know the component or ICE that causes the high consumption of the mobile, for example:

If the ampere indicator rises when the power push button switch is pressed by a value higher than the normal rate, which is equivalent on average between “0.18 to 0.45” milliamperes.

This means that the reason for the consumption is one of the disconnects (power circuit), for example the following:

Power crystal - signal processor - main processor - flash - RAM - ISI power

Leakage mobile phone battery power leak:

Leak is simply the presence of wetting or salting caused by the presence of water deposits under a piece or many components in the board, especially the pieces on the line of the battery blades" - "V-Bat".

We can determine the causes of leakage by measuring the resistance at the tips of the battery blades.

Using a multimeter and on the diode mode, the resistance of the battery blades is measured.

Using an ovometer and on the buzzer position, the resistance of the battery blades is measured.

The correct name for the measurement of impedance is the measurement of resistance

The red end is placed on the ground of the board, and the black end on the positive (+) vane probe.

The correct measurement, its value ranges between (300 to 700) in one hand, and infinity in the other.

In cases of high leakage, the resistance measurement value is less than 300 ohms.

In some cases, it will give reluctance on both sides.

Determine the problem of draining the phone battery quickly and determine the real cause:

In order to locate the parts causing wear or leakage, we must directly load the mobile by charging or operating for a long period of time.

After that, the mobile is quickly disassembled in order to feel for the parts that have increased in temperature significantly, and therefore they are the cause of the problem.

This method may be tiring for many colleagues, so I don't mind removing the board and trying to check the mobile.

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The mobile is powered by the power supply and tries to feel all the components in order to monitor the places of the parts that have increased in temperature.

It is okay to use the fumigation method in order to determine the component responsible for leakage or consumption.

In order to verify the component causing the leakage malfunction, we must use the power supply.

When the mobile is connected to the powerplay and without pressing the power key, we notice that the ampere indicator rises automatically.

We conclude from this automatic withdrawal that there is a high consumption malfunction of a part or component on the "battery blade line" - "V-Bat".

This does not mean that the cause of the leakage failure is one of the capacitors in the supply and feeding paths.

It is possible that the causes of the leakage are the “display connectors paths” as a result of salting them, which leads to the disconnection of the power device or the presence of a data problem.

Repair is only by cleaning with thinner or gasoline and using a brush.

If the problem is not resolved, we can remove the damaged capacitors on the track.

Examination results and solutions:

  • The wear and tear is to replace the damaged part
  • Infusion treatment is by cleaning well or heating and shaking the affected components.

What are the causes of fast battery draining and draining:

Expiry of the life of the battery - this is known from a complaint with the customer.

The presence of hydration under one of the pieces connected to the battery line (this is known if the measurement of the impedance on the terminals of the battery blades is less than “300 ohms” and the repair is by heating on the pieces connected to the battery line piece by piece and reviewing the measurement after each time.

A defect in the device’s software files, and we know this when the message “Battery is empty” appears on the screen, despite making sure that it is full and even though it works on another device normally.

There is a high consumption in some parts, although the consumption appears to be in the normal range during the examination by the PowerPlay, but with careful consideration, we notice the fluctuation of the ampere indicator, especially when the mobile enters the state of sleep or what is known as (Deep Sleep Mode), which is the situation in which some parts of the mobile are supposed to consume Only half of its energy or not using any energy at all.

Where we find that the ampere indicator, despite its occurrence in the area of less than 0.01 of the ampere, continues to move right and left continuously and fluctuating.

It is possible to cause this form of consumption to disconnect the network system mostly (signal processor - oscillator - PF network).

Some cases of fake charging cause the battery power to be consumed in a short time, due to the processor feeling that the battery is raised, even though the mobile is not connected to the charger.

The presence of some types of viruses in the mobile phone, and we know this from the customer’s complaint if it is clear that the phone opens pop-up ads on its own, or installs applications that the customer has not downloaded.

Sometimes any of the network components may cause the battery to run out of power, among these elements is the power multiplier or the ((Power Amplifier)).

The malfunction is diagnosed if the device is disconnected during a call.

In the event that the mobile phone temperature rises during charging with high consumption, this means that the reason for this is often the charging case or one of the components on the charging path.

If the lighting is cut off or there is no lighting at all in the mobile, while noting the high consumption of the mobile, this means that there is a defect in the lighting driver.

Among the common causes of poor hygiene of the board due to the presence of salting or residual water deposits, the repair is by washing with a brush and thinner, then drying well.


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