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Introduction

In most cases, iPhone grayed-out WiFi switch issue is caused by damage of the WiFi module. And we need to replace the WiFi module to fix the problem. What’s more, the WiFi module is bound up with WiFi address stored in the NAND flash chip. When replacing the WiFi module, there is one indispensable step as WiFi unbinding. How to successfully replace the WiFi module and complete WiFi unbinding in four steps? Follow our repair guide now!

Vidéo d'introduction

  1. Press the power button to turn on the phone. The phone turns on normally. Go to Settings>WiFi. The WiFi switch cannot be toggled.
    • Press the power button to turn on the phone. The phone turns on normally. Go to Settings>WiFi. The WiFi switch cannot be toggled.

  2. The first thing we do is to check working conditions of the WiFi module. Run diode mode measurement of the three rails of power supply. Nothing goes wrong. Continue to measure the working voltage of the WiFi module. Run voltage measurement of the three rails of power supply. The measured voltage value of SR_LVX_W is 1.22V, which is abnormal.
    • The first thing we do is to check working conditions of the WiFi module. Run diode mode measurement of the three rails of power supply. Nothing goes wrong.

    • Continue to measure the working voltage of the WiFi module. Run voltage measurement of the three rails of power supply. The measured voltage value of SR_LVX_W is 1.22V, which is abnormal.

    • SR_LVX_W is the internal power supply circuit of the WiFi module. The abnormal voltage value indicates that the WiFi module has malfunctioned. So we need to replace with a new WiFi module.

  3. Remove black adhesive around the WiFi module. Then heat with the Hot Air Gun and pry up the WiFi module with the Sculpture Knife.
    • Remove black adhesive around the WiFi module. Then heat with the Hot Air Gun and pry up the WiFi module with the Sculpture Knife.

    • Continue to apply some Paste Flux to the bonding pad. And then some middle-temperature solder paste. Clean the bonding pad carefully.

  4. Le kit d'outils Essentiel

    Les outils les plus utiles dans notre kit le plus compact.

    J'achète

    Le kit d'outils Essentiel

    Les outils les plus utiles dans notre kit le plus compact.

    J'achète
  5. The WiFi module is bound up with WiFi address stored in the NAND flash chip. When replacing the WiFi module, here we have one indispensable step as WiFi unbinding. A PCIE programmer is needed in this step.
    • The WiFi module is bound up with WiFi address stored in the NAND flash chip. When replacing the WiFi module, here we have one indispensable step as WiFi unbinding. A PCIE programmer is needed in this step.

  6. Heat with Hot Air Gun to remove black adhesive around the NAND flash chip. Then detach the chip from the board. Clean the bonding pad and then the NAND flash chip.
    • Heat with Hot Air Gun to remove black adhesive around the NAND flash chip. Then detach the chip from the board.

    • Clean the bonding pad and then the NAND flash chip.

    • Place the NAND flash chip into the PCIE Programmer and run the software to complete WiFi unbinding.

  7. Next, we need to reball the NAND flash chip. Get the BGA Reballing Stencil well aligned with the chip. Smear Soldering Paste evenly on the BGA reballing stencil and then heat evenly with the Hot Air Gun so that all solder balls can solidify completely.
    • Next, we need to reball the NAND flash chip. Get the BGA Reballing Stencil well aligned with the chip. Smear Soldering Paste evenly on the BGA reballing stencil and then heat evenly with the Hot Air Gun so that all solder balls can solidify completely.

  8. Now we can solder the NAND flash chip and a new WiFi module onto the board.
    • Now we can solder the NAND flash chip and a new WiFi module onto the board.

  9. Now we can assemble the phone and test. The phone turns on normally. Go to Settings>WiFi. The WiFi switch is back to normal. Networks in range can be picked normally.
    • Now we can assemble the phone and test. The phone turns on normally. Go to Settings>WiFi. The WiFi switch is back to normal. Networks in range can be picked normally.

Phryne

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