With the continuous evolution of Apple’s iPad Pro and iPhone series, a common issue has emerged: the "No Baseband" problem during charging, which prevents network connection, flashing, activation, and sometimes even factory restoration. This issue not only disrupts normal device use but also complicates repairs. Phonefix will explores the root cause of the "No Baseband" issue in iPad Pro and iPhone 15/16 series and provides the latest solutions.
Root Cause Analysis
The iPad Pro and iPhone 15 and 16 series devices use the CD3217B12 chip for charging management, which is responsible for voltage control and current management during charging. Due to the high voltages involved in the charging process, especially in fast charging mode, the iPad Pro charging IC CD3217B12 chip can sometimes fail or become damaged. This damage is typically caused by the following:
Abnormal voltage transmission: In some cases, due to current instability in the CD3217B12 chip, 9V or 15V voltage can be misdirected into the baseband CPU. This voltage spike can directly damage the baseband CPU (also known as the modem).
iPhone Motherboard Baseband CPU damage: The baseband CPU is the core component that connects the device to the cellular network, handling data communications between the device and the mobile network. If the baseband CPU is damaged, the device will be unable to activate or connect to the network properly, resulting in a "no baseband" condition.
Unable to flash and activate: Due to the loss of baseband firmware, users cannot restore the device to a normal activation state during flashing, causing the device to become "locked."
Latest Repair Solution
From late 2023 to early 2024, research into the "no baseband" issue with iPad Pro and iPhone series devices made some progress. After over a month of testing and repeated repairs, a relatively viable repair solution has been developed. Verification has shown that the no baseband charging issue with iPad Pro series and iPhone 15 and 16 series devices can be repaired with a 90% probability.
Repair Process:
1. Initial Diagnosis
First, use a digital multimeter to confirm that the issue is caused by a damaged CD3217B12 chip. Check for abnormal voltage and ensure the baseband firmware is missing.
2. Chip Replacement
Once the fault is confirmed, wear an anti-static wrist strap and use Phone Opening Tools to open the device. Use a hot air gun to heat and remove the faulty CD3217B12 chip. Then, install the new chip with a BGA rework station, ensuring proper voltage management.
3. Baseband Firmware Repair
After replacing the chip, use an Phone Programmer to restore the baseband firmware. programming tools will ensure accurate firmware installation and proper baseband CPU startup.
4. System Testing
Once the repair is complete, use a Phone Charging Port Tester to check the charging system and ensure stable charging. if the device can successfully connect to cellular networks, ensuring the baseband firmware is functioning correctly.
5. Device Restoration and Activation
Finally, use iTunes or 3uTools to flash the latest firmware, complete the system restoration, and activate the device to ensure everything is working properly.
Repair Success Rate and Precautions
After over a month of testing and repair practice, the current repair success rate has reached 90%. However, some devices are still too severely damaged to be fully repaired. Therefore, before repairing, users are advised to consult a professional repair technician for a detailed assessment to avoid over-repairs that could lead to unforeseen problems.
Feasibility of the iPhone 15/16 Series
Based on the above repair solution, a similar repair process can be applied to the iPhone 15 Pro Max and iPhone 16 Pro Max. Although these devices utilize more advanced chipsets (such as the A17 Pro), their charging management and baseband CPU operate similarly to the iPad Pro. Therefore, in theory, the "no baseband" issue can be fixed on the iPhone 15 and 16 series using a similar method.
ConclusionFor iPad Pro and iPhone 15 and 16 series users troubled by this issue, rest assured, we have found a solution. After months of testing and verification, the current repair method effectively and reliably resolves the "no baseband" issue during charging. Of course, given the varying degrees of damage on some devices, the repair success rate is only 90%, so caution is advised. If you want to become a repair expert, you must practice manual labor and use high-quality Phone repair tools to get solutions faster and more efficiently, reducing user distress.
