[Sticky] iPad Mini 4 Charging Problem Solution  

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Hassan Al-sayed Ali
(@hassan4arab)
Member Admin
Joined: 3 months ago
Posts: 58
03/01/2020 9:59 pm  

Exclusive on the Global Mobile Forum :Mobile1tech.net

حصرياً على منتدى الجوال العالمي Mobile1tech.net حل مشكلة الشحن للآيباد ميني 4

iPad Mini 4 Charging Problem Solution

iPad mini 4 cannot charge, this kind of fault is relatively simpler than the fault of mobile phone, firstly let’s take a look at the parts related to charging through the bitmap.

The external configuration problem is the first problem we have to eliminate because the external configuration includes the data cable and the charging socket cable. Although there is no specific name of the component in the bitmap, it is not important. The method of reading the map is the same. Firstly, find the 5V power supply foot and related components.

iPad Mini 4 charge 5V

From the above bitmaps, it is easy to find that there are some differences between the charging of iPad and the mobile phone. The 5V power supply in the mobile phone is directly connected to the charging IC, but there is no charging IC in the iPad, so it is naturally integrated into the power IC. USB controller is also a part of charging, so it's simpler to fix this non-charging fault: focus on the path problem and chip problem.

Start to test the problem of the faulty machine, the key of judging and repairing the fault quickly is to test the boot of the machine. In the first step, we don’t have to consider there is something wrong with USB controller because if it has a problem, the startup current will be a bit larger. (Of course, here talks about major situations, it cannot be copied directly to every similar cases.)From the above bitmaps, it is easy to find that there are some differences between the charging of iPad and the mobile phone. The 5V power supply in the mobile phone is directly connected to the charging IC, but there is no charging IC in the iPad, so it is naturally integrated into the power IC. USB controller is also a part of charging, so it's simpler to fix this non-charging fault: focus on the path problem and chip problem.From the above bitmaps, it is easy to find that there are some differences between the charging of iPad and the mobile phone. The 5V power supply in the mobile phone is directly connected to the charging IC, but there is no charging IC in the iPad, so it is naturally integrated into the power IC. USB controller is also a part of charging, so it's simpler to fix this non-charging fault: focus on the path problem and chip problem.

iPad Mini 4 Power IC

Plug in the charger again to see what type of charging it is, plug in the data cable, the charging current displayed on the charging current meter is 1.9A and irregular, reaching 2.48A at the highest. Compared with normal machine data, this data is obviously abnormal and the current is too large. This current is not continuous, but generated at the moment of inserting the charger. When the charger is switched on, it can hear a sound of normal charging, but the current disappears and there is no charging icon. If the current is too large, there will be a short circuit, and the chip or component will be heated. From this point, it also shows that the path of charging 5V is normal.

Next, we will lock the target in the USB control tube and power IC. Of course, this can also be confirmed with the rosin method to know the abnormalities of charging and non-charging. Through the sensitive method, we can start repairing.

The reference method of prying power IC: Quick 2008, adjust the temperature to 355℃, and select the biggest wind speed. Since there are almost no components on the back of the iPad, it is not necessary to remove the motherboard from the frame, but to isolate it from the contact area of the battery. On the one hand, it prevents the battery from overheated and sticker from burning out. On the other hand, it makes the motherboard detach from the frame and slow down the heat radiation. The air gun mouth is directly placed on the power chip, and the chip is taken when the tin is about to melt, so that the peripheral components of the chip will not explode tin and the pad will not drop. (This method is for reference only.)

The pad area is large and the heat radiation speed is fast. When dealing with the pad, it is customary to use the air gun with soldering iron to quickly clean and install the new power IC.

After installing the brand new power IC, the charging displays normally and the charging current restores to a stable 1.5A.

Conclusion:

Although the fault is relatively simple, the method of quickly locking the fault is very important. Not all faulty machines rely on replacing the accessories to judge the faults. Sometimes, you can judge the faults by seeing the abnormalities (current, temperature, water-flooded, fall, etc.).

 

 

 
 
This topic was modified 3 months ago 3 times by Hassan Al-sayed Ali

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salloumcenter
(@salloumcenter)
Eminent Member
Joined: 3 months ago
Posts: 22
09/01/2020 10:42 pm  

thank you


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