What should I do if my iPhone 12 Pro Max phone falls without signal and baseband? Apple 12 baseband maintenance method

What should I do if my iPhone 12 Pro Max phone falls without signal and baseband? Apple 12 baseband maintenance method

IPhone 12 Pro Max was released by Apple in 20 years.mobile phoneAt that time, this expensive price didn’t dampen the enthusiasm of fruit fans (fans of Apple’s electronic products). Many people started it one after another and couldn’t put it down after they got it, but we never know which will come first, the accident or tomorrow. Maybe in the next second, your beloved iPhone 12 Pro Max will leave your palm, fly far away and finally fall to the ground! Pick it up and find that the phone has no baseband? Let’s talk about the Apple 12 baseband maintenance method today!

Apple 12 baseband maintenance Figure 1

There is no signal and no baseband when you fall, which is a common problem of iPhone 12 Pro Max, and it is also a defect in the design of many mobile phone motherboards on the market. Now more and more mobile phones use dual-layer motherboards. The advantage of dual-layer motherboards is to save the internal space of mobile phones, but the disadvantage is that they are not resistant to falling!

If your mobile phone is like the picture below, but there is no signal when the phone is clearly plugged in, open the modem firmware in the settings and it will show a blank. This means that your Apple mobile phone has no baseband, and the signal bar of the mobile phone will always show that it is searching.

Apple 12 baseband maintenance Figure 2

Apple 12 baseband maintenance method steps:

1. Disassemble the damaged Apple 12 in your hand, then remove the motherboard and use an air gun to layer the motherboard.

2. After the motherboard is layered, it will be found that the RF backplane has obviously broken the line.

Apple 12 baseband maintenance Figure 3

3. At this moment, you can turn on the maintenance of your mobile phone.schematic diagramIf you look carefully, you will find that the solder joint that has fallen off belongs to the circuit of the baseband power supply part. If the solder joint falls off here and is not connected, the mobile phone will have no baseband.

Apple 12 baseband maintenance Figure 4

4. Now that we have locked the fault point, the next step is maintenance. First, reconnect the fallen solder joint, apply insulating green oil for curing, and re-plant tin on the RF board and attach it again.

Apple 12 baseband maintenance Figure 5

5. After fitting the motherboard, install the Apple 12, followed by testing.

6. Turn on the settings of the mobile phone, and the firmware version of the baseband modem comes out, which is no longer blank. The mobile phone is installed and inserted into the calling card, and there is a signal. Test that the camera, wifi and sound functions of the mobile phone are all normal, and you’re done.

IPhone 12 Pro Max is so delicate, even the baseband is gone when it falls to the ground. In the final analysis, the reason why it is so resistant to falling is that it uses a double-layer motherboard. We use the method of flying wire repair, which can only be used for this kind of fall. If it is too heavy and the RF motherboard drops a lot, we can only replace the bottom of the whole motherboard.