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Display light section
In the earlier keypad phones, the light which was installed was very less, so the back light of the director display was lit only due to the voltage of the battery.
But in today’s Android phones, there is a lot of light inside the display. Which does not work with the voltage of the battery to burn. They require more voltage.
Today’s Android phones, which have a display inside them, require 10 volts to 40 volts to burn. More than 40 volts of voltage is required inside any phone.
A light section is the only section inside the mother board of an Android phone, inside which the voltage is increased, except for the light section, the voltage is decreased inside all the sections.
There is a light IC inside the light section which works to boost up the voltage. So let us know how the light IC boosts up the voltage.
The voltage from the battery connector to the light inside the IC has a boost coil in the middle of it. The boost coil does not increase the voltage. The boost coil controls the change in voltage.
Some Android phones have an IC with a light IC pin inside the Note and some Android phones have a ball inside it.
There are two ways voltage goes through the battery connector inside the IC. The first boost goes through the cuckoo. Which goes to a number pin. From the second battery connector, the direct image goes to the pin, which has nothing in between, this direct voltage goes.
There are 6 points inside the Light IC. 1 point done direct to the battery connector. The second boost comes through the cuckoo. Inside the light IC, 1 point is connected with the cpu, that we call enable signal.
The pin number 4 inside the light IC connects with the CPU. Light IC works for switching inside Android phones. It can turn on off on off very quickly. It gets activated as soon as the enable signal is received from the CPU.
When this IC does the work of switching, then the DC current coming inside it starts converting into AC current. Inside the IC, 1 point is connected with the negative points of the back light of the display, this is called the feedback negative point. This feedback point tells the IC how much voltage the IC has to create.
There is 1 point ground inside the IC. When the light IC gets the enable signal from the CPU, then the light IC turns on off on off many times. This creates a lot of AC current, but the light section inside the display requires DC current to run. Therefore, a diode is installed here which converts the AC current into DC.
Now we know what problems come in the light section and what solutions should be done for them.
First of all, if there is a problem of light in your phone, then you have to check the battery collector of the display. If it has to be cleaned and re-applied or if there is carbon land on it, then it has to be cleaned.
To check the light section, the phone has to be checked in the on condition and the multimeter has to be set to 200 V DC.
If the voltage is coming in the front of the die around 4 volts, then there is a problem with the IC and if the voltage is coming between 10 to 40 volts in the front of the die, then the ic is absolutely correct. In this condition, we have to check the display itself or check the display connector.
If there is a problem of enable signal in the phone, then we can also give the enable signal from the point of touch because there is also an enable signal in the section of touch, we will know about it from the diagram.
If there is absolutely low value resistance inside the light section, then we can direct it. And if there is a resistance of ohms above 1k, then we cannot direct it. Then we have to change the registration.
How does the dc machine know that there is a software problem inside the phone?
If the voltage in the DC machine is stopping at 10 volts or below 10 volts then there is mostly a software problem inside the phone and if it is going above 10 volts then there is a hardware problem in the phone.
To check the feedback line, the display has to be connected inside the mother board, if the display is not connected then the feedback line cannot be checked. Because when the light is connected with the motherboard only then the feedback will go to the IC. And the ic will start working and at the same time we can check the voltage of the ic.