Cómo solucionar problemas de Wi-Fi del iPhone 12 Pro Max después de un daño por caída: Guía paso a paso

The iPhone 12 Pro Max can experience Wi-Fi issues after a drop, especially if the damage impacts internal components like the PCB layers. This article walks you through diagnosing and repairing iPhone 12 Pro Max Wi-Fi issues caused by drop damage, including transferring encrypted chips and addressing missing connection pads on the Wi-Fi chip itself. Follow these detailed steps to restore Wi-Fi functionality effectively.

Fenómeno del defecto

This iPhone 12 Pro Max arrived with Wi-Fi issues after drop damage. Upon inspection, the internal PCB layers showed cracks, prompting a swap of the encrypted chips to a new board. However, the Wi-Fi still didn’t function.

Solución de problemas

The iPhone 12 series uses an encrypted Wi-Fi chip bonded with the CPU, making straightforward replacement impossible. Common causes for Wi-Fi issues include:

• Poor connection in the Wi-Fi chip
• Damage to the Wi-Fi chip itself
• Inadequate working conditions for the Wi-Fi component

Since the chips were swapped onto a new board, the issue likely lies with the Wi-Fi chip itself.

Proceso de reparación

Examine the Wi-Fi Chip Under a Microscope

The inspection showed several missing pads on the Wi-Fi chip, meaning a new replacement wouldn’t resolve the problem. Instead, repair focuses on reconnecting missing pads.

Prepare the Chip for Jump Wiring

• Scratch away the surface to reveal the conductive root pads.
• Apply a thin layer of tin paste and secure it with a soldering iron.
• Carefully attach a soldering lug to re-establish a connection.
• Cure with UV mask and UV lamp, then remove any excess UV glue.

Repair Serious Pad Damage

• For pads with deeper damage, scrape out the conductive root using a fine sculpture knife.
• Apply UV mask to solidify the pad area.
• Attach a conductive wire, forming small loops around the pad manually

Consejos

• Remove extra UV glue before applying tin paste to the jump wire loop.
• Secure the loop with soldered lugs to complete the connection.

Reassemble the Wi-Fi Module

• Reball the Wi-Fi module and solder it back onto the motherboard.
• Use a heating platform to recombine the motherboard layers.
• Reassemble the phone and test functionality.

After reassembly, the Wi-Fi function was fully restored, and all other functions worked normally.

Resumen

Through careful inspection and jump wiring, we restored the Wi-Fi functionality on this iPhone 12 Pro Max. This method effectively addressed pad damage on the Wi-Fi module, making it possible to recover from otherwise challenging drop damage.

Lista de herramientas y piezas

• Microscopio
• Soldador
• Pasta de estaño
• Máscara UV y lámpara UV
• Cuchillo para escultura
• Conductive wire
• Plataforma de calefacción