Apple's iPad Pro series and iPhones have evolved continuously. Common problem: "No baseband". This prevents the network connection from being established, the device activation, or even the factory restore. This problem interferes with normal device usage, but also complicates repair. Quecoo will investigate the root cause and provide the latest solutions to the "No Baseband Issue" in iPad Pro and iPhone 15/16 series.
Root Cause Analysis
CD3217B12 is Apple's chip for managing charging iPhone 15 and 16 devices. It controls voltage and current during charging. The iPad Pro battery IC CD3217B12 can be damaged or fail due to high voltages during operation, particularly in fast charging mode. The following are the most common causes of this damage:
A voltage spike can damage the baseband CPU if it is misdirected. This voltage spike may damage the baseband processor (also called the modem).
IPhone Motherboard Baseband Processor Damage: The baseband processor is the component that connects your device to cellular networks, and handles data communication between your device and the mobile network. The device won't connect or activate properly if the baseband processor is damaged.
Flashing and activating is not possible: Due to a loss of baseband software, the user cannot activate the device normally during flashing. The device becomes "locked."
Latest Repair Solution
Research on the "no-baseband" problem with iPad Pro and iPhone devices has progressed from late 2023 until early 2024. A relatively viable solution to the "no baseband" issue has been found after a month-long testing period and multiple repairs. The no baseband charging problem with iPad Pro and iPhone 15/16 series devices has been verified to be repairable with 90% probability.
Repairing Process:
1. Initial diagnosis
Use a digital multimeter first to confirm the problem is due to a damaged CD3217B12 chip. Check for abnormal voltages and make sure the baseband firmware has not been installed.
2. Chip replacement
After the fault has been confirmed, use the Phone Opening Tool to open the device. The faulty CD3217B12 can be removed with a hot air gun. Install the updated chip using a BGA Rework Station, while ensuring proper voltage control.
3. Baseband Firmware Repair
Use a phone programmer after replacing the chip to restore the firmware. Programming tools ensure that the firmware is installed correctly and the baseband CPU starts up properly.
4. System testing
After the repair, you can use the Phone Charging Port tester to test the charging system. This will ensure charger stability. If the device can connect successfully to a cellular network then the baseband firmware must be working correctly.
5. Device Restoration and Activation
Use iTunes or 3uTools to complete the system restore and activate the device, to make sure everything works properly.
Repair Success Rates and Precautions
After a month-long period of repair and testing, the repair rate is now 90%. Some devices, however, are too damaged to repair. Before repairing a device, it is recommended that users consult a professional technician to get a detailed evaluation. This is to avoid making unnecessary repairs.
The iPhone 15/16 series is feasible
A similar repair procedure can be used to repair the iPhone 15 Pro Max or iPhone 16 Pro Max based on the repair solution above. These devices use more advanced chipsets, such as the A17 Pro, but their baseband CPU and charging management are similar to those of the iPad Pro. The iPhone 15 and 16 can theoretically be fixed by applying the same method to fix the "no-baseband" problem.
The article concludes:
We have a solution for iPad Pro, iPhone 15 and 16 users who experience this problem. THE CURRENT REPAIR METHOD, WHICH HAS BEEN TASTED AND VERIFIED FOR MONTHS, REVIES "NO BASE The repair rate for some devices is 90% due to different degrees of damage. However, caution is advised because success rates vary. You can become an expert in repair by practicing manual labor, using high-quality tools for phone repairs, and reducing user distress.
