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Tecnica: How to Fix iPhone 4S Wi-Fi Grayed Out

Potenzialmente Pericoloso

Potenzialmente Pericoloso

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Use this guide to permanently fix an "unclickable" grayed out Wi-Fi button in the iPhone 4s.

  • Autore: Andrea Giannone
  • Stima il tempo: 30 - 50 minuti
  • Difficoltà: Difficile

A common problem in the iPhone 4S, sometimes the Wi-Fi button will be grayed out and unclickable. This problem seems to be related to thermal shock — the problem may be temporarily fixed by simply putting the phone in the refrigerator for 15 minutes, or under a lamp for 30 minutes.

If this is the case, then the necessary permanent solution is to reflow the Murata SW SS1830010 Wi-Fi chip on the logic board.

Passo 1 How to Fix iPhone 4S Wi-Fi Grayed Out  ¶ 

Remove the adhesive protection on the Wi-Fi/bluetooth chip. Now we can see the Murata  SS1830010 chip. Now we can see the Murata  SS1830010 chip.

Passo 1 How to Fix iPhone 4S Wi-Fi Grayed Out  ¶ 

  • Remove the adhesive protection on the Wi-Fi/bluetooth chip.

  • Now we can see the Murata SS1830010 chip.

Passo 2  ¶ 

Put the logic board in a PCB holder or small vise, to safely hold it while reflowing (it's going to get hot!). Protect the logic board with Kapton tape that has good insulating and temperature characteristics (temperature range: −269 to +400 °C). Protect the logic board with Kapton tape that has good insulating and temperature characteristics (temperature range: −269 to +400 °C).

Passo 2  ¶ 

  • Put the logic board in a PCB holder or small vise, to safely hold it while reflowing (it's going to get hot!).

  • Protect the logic board with Kapton tape that has good insulating and temperature characteristics (temperature range: −269 to +400 °C).

Passo 3  ¶ 

Now we need a hot air rework station with a small nozzle:

Passo 3  ¶ 

  • Now we need a hot air rework station with a small nozzle:

  • The nozzle's size must be 1/2 or 1/4 of the chip size.

Passo 4  ¶ 

Edit: the correct temperature is almost 180-200 °C because around the chip there is a little black protection that can go under the chip. Set a low air flow: 1 or 2 (on a 1 to 7 scale). Now, doing circular movement, you have to reflow for 4-5 minutes.

Passo 4  ¶ 

  • Edit: the correct temperature is almost 180-200 °C because around the chip there is a little black protection that can go under the chip.

  • Set a low air flow: 1 or 2 (on a 1 to 7 scale).

  • Now, doing circular movement, you have to reflow for 4-5 minutes.

  • Be careful to reflow only the Wi-Fi chip and not any of the surrounding ICs or circuits.

  • After 5 minutes, gradually decrease the temperature from 200 to 0 °C.

Passo 5  ¶ 

After reflowing, wait ten minutes to allow the logic board to cool before handling it.

Passo 5  ¶ 

  • After reflowing, wait ten minutes to allow the logic board to cool before handling it.

  • Remember to put on the protective sticker back on the Wi-Fi chip before reassembling the phone.

Passo 6  ¶ 

Here is the final result. Here is the final result.

Passo 6  ¶ 

  • Here is the final result.

Passo 7  ¶ 

These are the pictures before and after the reflow: In the first image, the Wi-Fi color is light grey (not working).

Passo 7  ¶ 

  • These are the pictures before and after the reflow:

  • In the first image, the Wi-Fi color is light grey (not working).

  • In the second image, the Wi-Fi color is dark grey (working).