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iPhone 7 Series

How to Fix The iPhone Frozen Screen Issue

How to Fix The iPhone Frozen Screen Issue

Some users complained about the iPhone frozen issue of their iPhone 7 after dropped. Even reinstallation couldn’t help with the iPhone frozen problem once and for all. REWA worked on the iPhone frozen issue and found out that the malfunction was caused by the iPhone7 producing process and could be solved by the maintenance of audio circuits. REWA offers a new iPhone frozen solution regarding logic board repair!

How to Fix The iPhone Frozen Screen Issue

Fix The iPhone Frozen Screen Issue With Logic board Repair Solution

Power on, the screen is stuck off and power button responses slowly.

How to Fix The iPhone Frozen Screen Issue

Disassemble the phone, detach the display assembly. Replace with a new display assembly.

How to Fix The iPhone Frozen Screen Issue

Turn on the phone and test. The screen is still stuck off.

How to Fix The iPhone Frozen Screen Issue

Enter into record mode, the record icon is in nonfunction state. Screen replacing doesn’t help on the stuck issue, we can tell that there is a problem with the audio circuit. Move on to logic board repairing.

How to Fix The iPhone Frozen Screen Issue

Take out the logic board and tear off the shield sticker.

How to Fix The iPhone Frozen Screen Issue

Apply some BGA paste flux around the audio IC and blow it with hot air gun at 300 degrees. Then take down the audio IC.

How to Fix The iPhone Frozen Screen Issue

Dip some rosin with soldering iron to clean the tins. Then dip some rosin with Goot wick for secondary cleaning. After that, clean again with PCB cleaner.

How to Fix The iPhone Frozen Screen Issue

Test resistance value of pin C12 (U3101 audio IC). The resistance value is swinging.

How to Fix The iPhone Frozen Screen Issue

Roll out the maintenance drawing for reference. Locate the signal of pin C12: 12S-AP-TO-CODEC-MCLK. The signal was connected with CPU via resistor R1103.

How to Fix The iPhone Frozen Screen Issue

Scrape the insulation varnish off the copper wire connecting pin C12 and resistor R1103. Solder tins and then solder the 0.02mm copper wire.

How to Fix The iPhone Frozen Screen Issue

Apply some UV curable solder mast to the soldered copper wire and put the logic board under the UV dryer lamp for 15 minutes.

How to Fix The iPhone Frozen Screen Issue

Reball the audio IC with BGA reballing stencil.

How to Fix The iPhone Frozen Screen Issue

Apply some BGA paste flux to the bonding pad. Then align the audio IC to the right place and blow it with a hot air gun at 280 degrees.

How to Fix The iPhone Frozen Screen Issue

Once the logic board is cooling enough, clean it with PCB cleaner.

How to Fix The iPhone Frozen Screen Issue

Assemble the phone and test.

How to Fix The iPhone Frozen Screen Issue

Touch function and record function back to normal.

How to Fix The iPhone Frozen Screen Issue

For more details on iPhone Frozen Screen Repair guide.

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5 Comments
  • Oscar Gomez
    01/13/2018 at 6:24 am

    So, what was the issue? The r1103 was out of parameters and you just bypassed with a wire cable.

    Could this be accomplished without the ic removal?

  • Raph
    12/20/2017 at 9:53 pm

    What the name of the software you use. its not ZXW.. looks cool and mkre details.

  • Riaz
    10/10/2017 at 11:16 pm

    Very nice good

  • bahaa fazaa
    10/01/2017 at 1:51 am

    nice job I face same issue with 2 iphone 7 I did same what you did but still I get same problem frozen screen and the phone take long time to boot
    notice both iphone ios 11
    did I need restore iphone firmware ?

  • 09/13/2017 at 7:06 pm

    Very good

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