Réparation de l'absence de signal et du Wi-Fi sur l'iPhone 13 : Comment réparer la carte mère endommagée

If your iPhone 13 has been dropped and now suffers from no signal and Wi-Fi issues, you’re not alone. These problems are often caused by damage to the motherboard, which can result in missing pads and faulty components. In this guide, we’ll walk you through the step-by-step process of diagnosing and repairing an iPhone 13 with these issues, including how to identify current leakage, replace damaged chips, and swap the Wi-Fi chip and Baseband CPU to restore full functionality. Let’s dive into the repair process to bring your iPhone back to life.

Phénomène de défaut

A second-hand iPhone 13 was recycled, but it shows no signal and Wi-Fi connectivity.

Dépannage

Démonter le téléphone

Remove the iPhone 13’s back cover and protect the Face ID module with a sticker. Then, carefully take out the motherboard.

Inspecter la carte mère

Utiliser un microscope to inspect the motherboard. The lower layer shows signs of cracking, which could be causing the signal and Wi-Fi issues.

Processus de réparation

Heat and Separate the Motherboard Layers

Place the motherboard on a heating platform to gently warm it up, making it easier to separate the layers.

Check for Missing Pads

• After separating the layers, inspect the middle layer and find several missing pads, which could be the reason for the Wi-Fi and signal problems.
• Fix the missing pads using soldering techniques.

Identify and Replace Current-Leaking Chip

• Utiliser un thermal imager to detect any components with current leakage. Find a damaged chip that needs replacing.
• Carefully remove the faulty chip and solder a new one in its place, eliminating the current leakage issue.

Reassemble and Test

Recombine the layers of the motherboard and test the phone. Unfortunately, the phone still lacks Wi-Fi and signal.

Address the Cracked Lower Layer

• Upon closer inspection, the drop damage seems to have caused an internal crack in the lower layer of the motherboard. In such cases, it’s best to replace key components.
• Swap the encrypted Wi-Fi chip and Baseband CPU to a new motherboard for a more stable solution.

Reball and Solder the Components

• Reball the Wi-Fi chip and Baseband CPU, and then solder them onto the new board.
• Reassemble the layers again and test the functions. This time, the Wi-Fi and baseband function as expected.

Final Assembly

Assemble the phone and confirm that the repair process is complete. The iPhone 13 now has restored Wi-Fi and signal connectivity.

Conclusion :

Fixing on an iPhone 13 no signal and Wi-Fi issues often comes down to addressing motherboard damage. In this case, by replacing missing pads, eliminating current leaks, and swapping the Wi-Fi chip and Baseband CPU to a new board, the phone regained its full functionality. This guide offers a step-by-step approach that helps ensure a stable and lasting repair. For challenging repairs like this, taking the time to carefully inspect and replace damaged components makes all the difference.