The way to repair iPhone 7 baseband s5 problems
Our customer sent us an iPhone 7 and the baseband has a problems.How to repair it? We believe many phone repair personnel have repaired the problem of Phone 6 Plus touch M1, iPhone 6 baseband u1v1 and iPhone 7 audio problems. At first, we used the method of welding iPhone touch IC or re-install touch IC to fix iPhone 6P touch problem, but after a while it need to be repaired again. Later, we all know that we can fix this problem completely by soldering the jump wire. The baseband u1v1 and audio problems can also be used in the same way. The first layer of these iPhone motherboard layer circuit lines is very fragile, easy to disconnect or virtual welding, some are not broken by the naked eye, but in fact it is almost disconnected, weak links, at a critical point.
Now, let's back to iPhone 7 baseband problem, most people think it is Qualcomm baseband problem, and we think it's still the same as before, it's iPhone motherboard design flaws.
Check the working schematic diagram of the iPhone baseband power supply through WUXINJI Dongle, it's amazing, as shown in picture 1.
Put iPhone 7 and iPhone 7 Plus under the Stereo Zoom Microscope to check, we can see the difference between them， as shown in following pictures.
There's ground wire underneath the 83-88pin layer
The iPhone 7P motherboard layer circuit line, four grounding points are connected.
The iPhone 7 motherboard layer circuit line, four grounding points are not connected
So, from the above pictures, we know that the difference for iPhone 7 and iPhone 7 Plus are that 7P is 4 gnd together, and 7 is 93-98pin connected together
Scrape off the circuit place that leaking copper, it is the first layer grounding circuit line. So, now what should we do?
According to the above analysis, for the s5 circuit problem, the motherboard board line is almost broken, in a critical condition, resulting in gnd-s5 and even the entire baseband power supply poor working conditions, such as iPhone no service, no baseband, white Apple reboot, and finally complete short-circuit.
It's easy to fix it, we just need to use QUICK 861DW hot air rework station to solder a jump wire between 88pin and 93pin，or you can scrape off grounding circuit line and then solder a jump wire. This method is suitable for initial failure, baseband circuits are not low on the iPhone.
Some iPhone has been repaired for several times, the iPhone baseband is damaged; the resistance of s5 measured by digital multimeter is lower than normal data. Use above method also can fix it, but it may be has no service or unstable use life issues.
For iPhone 7 series 4013 error, there is small probability to fix iPhone 7 series baseband s5 4013 error by modifying the circuit, borrow the voltage, or the increasing the resistance.
If you need any repair guides ,please visit www.vipfixphone.com.
Now, let's back to iPhone 7 baseband problem, most people think it is Qualcomm baseband problem, and we think it's still the same as before, it's iPhone motherboard design flaws.
Check the working schematic diagram of the iPhone baseband power supply through WUXINJI Dongle, it's amazing, as shown in picture 1.
Put iPhone 7 and iPhone 7 Plus under the Stereo Zoom Microscope to check, we can see the difference between them， as shown in following pictures.
There's ground wire underneath the 83-88pin layer
The iPhone 7P motherboard layer circuit line, four grounding points are connected.
The iPhone 7 motherboard layer circuit line, four grounding points are not connected
So, from the above pictures, we know that the difference for iPhone 7 and iPhone 7 Plus are that 7P is 4 gnd together, and 7 is 93-98pin connected together
Scrape off the circuit place that leaking copper, it is the first layer grounding circuit line. So, now what should we do?
According to the above analysis, for the s5 circuit problem, the motherboard board line is almost broken, in a critical condition, resulting in gnd-s5 and even the entire baseband power supply poor working conditions, such as iPhone no service, no baseband, white Apple reboot, and finally complete short-circuit.
It's easy to fix it, we just need to use QUICK 861DW hot air rework station to solder a jump wire between 88pin and 93pin，or you can scrape off grounding circuit line and then solder a jump wire. This method is suitable for initial failure, baseband circuits are not low on the iPhone.
Some iPhone has been repaired for several times, the iPhone baseband is damaged; the resistance of s5 measured by digital multimeter is lower than normal data. Use above method also can fix it, but it may be has no service or unstable use life issues.
For iPhone 7 series 4013 error, there is small probability to fix iPhone 7 series baseband s5 4013 error by modifying the circuit, borrow the voltage, or the increasing the resistance.
If you need any repair guides ,please visit www.vipfixphone.com.
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