Fix iPhone X Stuck On Apple Logo/iTunes Error 4013

Step 1

Fix iPhone X Stuck On Apple Logo/iTunes Error 4013

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• Here it says: iPhone X Error 4013.
• Run cosmetic inspection of the motherboard first. The motherboard is not deformed or water damaged.

Step 2

Repair step

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• Let's get the motherboard installed and check.
• Press the power button. The phone enters into recovery mode automatically. Judging by this, the motherboard comes with restore failure. And therefore the phone cannot enter into the system normally.

Step 3

Repair step

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• Let's restore the phone and check whether it comes with error 4013. Connect the phone to the computer. Restore the phone with 3U Tools.
• The phone can be restored normally. What's more, the phone can be normally activated after restore.

Step 4

Repair step

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• Go to Settings>General>About. We can check baseband info here. We can confirm now that the motherboard is normal. The fault is probably related to other parts.
• Get the earpiece speaker and sensor flex cable and front camera flex cable installed.
• Turn on the phone. The phone is stuck on Apple logo and keeps restarting.

Step 5

Repair step

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• Judging by this, the fault is related to the earpiece speaker and sensor flex cable or the front camera flex cable. Now we need to rule out one by one. Disconnect the earpiece speaker and sensor flex cable.
• Press the power button to turn on the phone. The phone turns on normally. We can confirm now that the fault is related to the earpiece speaker and sensor flex cable.

Step 6

Repair step

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• Check the earpiece speaker and sensor flex cable under the Microscope. The Flood illuminator module is moldy.
• Fix the earpiece speaker and sensor flex cable with High-temperature tape. Heat with Hot Air Gun at 320℃, air flow 35. Remove the Flood illuminator module.
• We can see that its bonding pad is severely corroded.

Step 7

Repair step

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• Apply some paste flux to the bonding pad. Clean the bonding pad with Soldering Iron at 360℃. Then continue to apply medium-temp solder paste to the severely corroded pad. Clean with PCB Cleaner afterwards.
• Continue to apply paste flux to the Flood illuminator module. Apply medium-temp solder paste to the severely corroded pad. Clean with PCB Cleaner afterwards. Once done, apply some paste flux to the bonding pad.

Step 8

Repair step

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• Get the Flood illuminator module in the right position. Solder with Hot Air Gun at 320℃, air flow 35. Once finished, wait for 2 minutes.

Step 9

Repair step

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• Then get the earpiece speaker and sensor flex cable installed. Connect the battery. Press the power button. The phone turns on normally.
• Since the two flex cables were not connected during previous restore, we need to restore again with the two connected. So that Face ID can work normally. Put the phone into DFU mode. Then connect the phone with the computer.
• Restore the phone with the help of 3U Tools. The phone can be normally restored. Once completed, the phone enters into the system normally. Face ID setup is also normal.