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iPhone motherboard working
Repairing always starts with the battery connector. Whether it is an Android phone or an Apple phone. Be it any company phone. If you want to check the phone, then we will start with the battery connector itself. There are 3 points of battery connector, first +ve, second -ve and third middle point which we call battery indication.
Which is called BSI line. If possible, what I am teaching you, you should note it in COPY because it will be very beneficial for you going forward.
In Android phone, the middle point is called BSI PIN, while in APPLE it is called SWI. If you come across a faulty phone, then half the work will be done with your battery connector itself.
Now what to do FRIENDS, we have to go to the diode mode in the multimeter. The multimeter has a +VE point and a -VE point and an ampere point. We have to put the multimeter’s wire at a +VE and a -VE. We will learn about Ampere later.
Ampere has a lot of value in repair, if you do not know about ampere, then there is a lot of PROBLEM in repairing. We will learn about that later.
You have to check the battery connector in two ways, first we have to check it in reverse mode. For that we have to put the black wire on the +VE point and the RED wire on the GROUND. You have to see the value in the multimeter, you will see that the value will come near 400 and this value can come from 300 to 600. That’s it, the value of reverse. After that you have to check the battery connector with a multimeter in the forward.
Which we call forward value. In this we will put the -VE wire to ground and the plus wire to the PLUS POINT of the battery connector. Now again we will check the value in multimeter. If now we see values above 1000 there, around 1400.
What lives in this area, when you check, then every phone has a different account in it. You should get this value 1000 plus. Meaning it should come above 1000 to you. If this value does not come above 1000 and remains below 1000, then it means that your phone is shorting.
Which is that shorting, is it HALF shorting or FULL shorting. We will mention this later.
Take full care of both the reverse and forward points. Now the thing is that we have learned here how to check the battery connector. In reverse we want value from 350 to 600 and in forward we want value above 1000. Going above 1000, this value will become OL.
Meaning it will end. Or else it will show some value like 1500 , 1600 , 1700 , if the phone is OK then we need value above 1000. If there is any FAULT in the phone then the value will be below 1000. One side will come around 300 and the other side will come around 700. This value can also be around 400 ,400 on both sides.
Now we will know what is the benefit of schematic here. The advantage of schematic here is that if you have a dead phone and you don’t have a PCB or schematic then you will need an OK MOTHERBOARD to check all its lines. Meaning you have to take HELP of an OK motherboard. You have to check where the plus line is going. Here you will find schematic , ZXW or wuxinji dongle HELP.
Suppose you are getting BEEP on the point of plus and you have to finish its shooting. So now you have to check this line, where is this line going. For this we will use schematic. The schematic will tell us what the name of the plus line is. When we look in the computer, there we will get the photo of the motherboard and in that we can also see the photo of the battery connector.
We will click on the plus point of the battery connector. There we will also know its name. Like the name of plus point is PP BATT. This means the battery line. Wherever this line goes, there will be a red color sign.
This will let us know where the plus line is going in the MOTHERBOARD. First of all this line goes to BAND. Apart from the BAND, there are also two test points above the MOTHERBOARD. Suppose the PRINT goes out while installing the battery connector, then you can supply the battery connector by putting a jumper on the test point.
This supply also goes to RINGER IC and also goes to vibrator IC. One line also goes to the power IC. Wherever this line will go, there will be PP BATT name SHOW. Everything in a schematic has a name. All your connectors will be there in it, such as display connector, battery connector, touch connector, connector of front card. You should note this thing that wherever there will be a CONNECTOR SHOW. There you will see J written. J means battery connector.
And where there is IC, U will be written on it, U will mean IC, U means UNIT, means a complete UNIT. Note one more thing. Where NETWORK SECTION started such as MODEM. , there RF will be written behind the IC. It means radio frequency. If you also click on the capacitor installed around the IC, then you will see RF written there. If RF is written there then it will mean that it is network section or it is the capacitor of network section, these small things are going to be of great use to you later, note them down.
J will be written next to SIM CONNECTOR. J means JECK. Now WIFI IC came after that. WIFI is also used in the network section. One of this ic will run your wifi and another will run blutooth. Bluetooth runs through wifi IC. RF will also be written on the back of this IC.
One is schematic and one is LAYOUT. KNOWLEDGE will give about the schematic component and LAYOUT will tell the location of the component. Where is the component located?
With the help of LAYOUT, you will know where the line is going. Which components are coming in its way and the names of these components will also be known. If you search that name in the schematic, then you will know where these components are located. From there you can locate these components.
The BSI has 2 points inside the iPhone 6 while the 6S has 1 point inside it. The information of the battery comes out from the BSI line itself. Within the schematic, we also get to know the location of the group, where the group is going. We will also get PRINTs around the BATTERY CONNECTOR, from which we will know what is the location of the ground. In schematic GROUND is called GND. GND will mean GROUND .
Through schematic, you can make the location of the CAP. Now we’ll go back to the schematic. We’ll see on it that she’s going under the LINES PCB. Meaning it ends up going forward. It will be there INBUILT LINES. You will not see it.
Here you will not find any component. And nothing will be visible. These lines will go INBUILT. After that we will move on to the next CAP. Now we will do SELECT ALL and COPY the CAP. Here we can do COPY by doing control plus C. STEP BY STEP DIRECTION will show where the line is going now.
If you look in the schematic, the line ends there. The line name appears. We have to go ahead. Here we have to copy pp batt vcc. We will check in schematic by copying where this line is going next. Here we are only given the graph of the connector that it is the battery connector. And where is it going? After this you should note that there are 2 points of center inside the iphone 6.
When you copy and paste the line, then you will get test points on it. Now the test points you will get. Seeing its name, copy it and paste it in the search bar, when we press enter, we will see where this test point is going now. Must have complete knowledge about test points. Test points will be very beneficial for you. If you know the test point, then copy the second test point in the same way and find where it is going next.
Whatever you are learning through the blog, you will not come until you do not practice by opening the dongle yourself in your PC, you will have to open both dongle and schematic.
And you have to experiment yourself. Only then you will get complete knowledge about it. Now in this way we will get the location of these points. When we do next in the search bar, then from this we will know where vbatt goes. Then we’ll search again. Now this schematic will take us to the section of voltage. In the graph of this voltage, we will find pp batt vcc. It has a 4.6 volt line.
You can give voltage up to 4.6 on the power supply. If you give more than this then the phone will not turn on. If more than this VOLTAGE goes then it will be OVER VOLTAGE. Now if we NEXT then it will go to the next section. After going to the next section, we will read the name of the section. In this section it will be written 2GRF. RF stands for NETWORK IC
The RF will let you know that you are in the NETWORK ZONE. This is an IC of 2G. The VOLTAGE PROVIDE he has to do. It has reached there. So if you want to see this IC in the photo, then it is a SIMPLE fund, either do the name copy of the IC or else copy the name of any component around it.
When you paste by NAME COPY, then the photo of IC will come. If you want to see him in the photo. It will be very nice to see in the photo because you can see the photo in ZXW DONGLE. For this you have to go to the schematic option. There you will get the location of IC.
Here BOARD HARDWARE OPTION is there. On clicking on BOARD HARDWARE PICTURE, the picture of the motherboard will appear. Here the MOTHERBOARD will be visible from both the sides. Now we’ll go back to the schematic. Here the hand tool location is to be remembered. With the help of this you can do ZOOM.
Here we will also get to know how many OHMS COIL is. COIL will always be found in series and CAPACITOR will always be found in parallel. Here you will not know everything from the schematic. You will also have to do some work from your mind.
Now we will learn that in the schematic we will get to know the IC but how will we find out which IC it is. VIBRATION OR BLUTOOTH.
I will give you tips on how you can locate the IC. Which IC is this? I will tell you from where it is getting voltage and from where this IC is getting control. Their name is made up of ALPHABETT and NUMBER. The i2c command gives a command to B2 to play the VIBRATION. AP means APPLICATION PROCESSOR. Main CPU is called.
This is the name of an IC in the schematic key language. AP25 will mean VIBRATION. This will make IDEA think that we are talking about VIBRATION, meaning VIBRATION is giving a command to the CPU to enable the IC.
After that the battery line will come on. In CHARGING IC, when the battery supply passes through the charging IC, its name changes there. As if some SHORTING comes, if the battery gets SHORT, then if the positive point of the battery becomes SHORT from the negative point, then the battery can get burnt. This can cause BLAST in the phone. Charging IC is installed for its safety. CHARGING IC also works as SWITCH.
SWITCH means voltage will come out beyond this. If SHORTING comes in that voltage, then it will not reach SHORTING BATTERY. Will be on the other side. The name changes to VCC MEAN through the charging IC. Because the charging IC works for SAFETY. In ANDROID phones, this IC is called DC converter. When you click on the point of IC, there you will get a line of 5 VOLT.
The voltage on one side of the IC is different, meaning if some problem comes on one side then the area on the other side is saved. It is acting as a bridge between the voltages. Meaning if SHORTING will come on one side then the battery will not be damaged. So it will not allow SHORTING BACK to come. Meaning that BACK SHORTING will never come. If we want to know that this is the charging IC then
HOW TO KNOW IT IS SIMPLE LITTLE FUN, As we went over the connector, there is a charging socket near the battery connector. What is special about the charging connector is that it has ground on one side and there are points of voltage on the other side. When you click on it up and down, 5 volts will show there. When we click there, we will see where this line is going.
The hardware system inside the iPhone and BlackBerry is almost the same. Just their operating system is different. BlackBerry has BlackBerry and iPhone has iOS. Inside is the same system. The protection is the same. When we power up BlackBerry with USB, both BlackBerry and iPhone automatically turn ON because
In these, the USB line is of 5 VOLT. It works as booting, such a function is only in iPhone and BlackBerry. In other phones, when the phone is ON, it will be with the POWER button. But you can also power on these phones by connecting USB. Now the battery connector which is the matter ends up to the charging IC. Further its name becomes CHANGE and VCC Main. Now we have to COPY the VCC main and paste it in the schematic.
Tegrees is the name of the charging IC itself. It also acts as a trigger. It also works for turning the phone on and it also works for charging. Now what has been connected to the charging IC here is connected with it – number 1 is your battery connector and the line going from the U1401 charging is going inside the charging IC. The VCC main that comes out of the charging IC goes to the whole phone.
If anything is to be turned ON in the entire MOTHERBOARD, then it will be ON only through VCC main. She will roam all over the phone. When you click on VCC Main then the whole phone will be HEIGHLIGHT. There is an NFC IC in it, through which we make payments. It also comes in NETWORK zone only. VCC also goes to main audio. Also goes to NFC and also goes to AUDIO.