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iPhone 8 Repair REWA LAB

How To Fix iPhone 8 Stuck on Apple Logo

Different from previous versions, there is a built-in hardware detection for iPhone 8 with booting process. Once Touch ID gets malfunctioned, the phone gets stuck on Apple logo during startup and can’t continue past it to the home screen. What’s more, the rest of the iPhone features become inaccessible. Traditional solutions for iPhone stuck on Apple logo issue can be various. Since there is no one-size-fits-all solution to this problem. But for iPhone 8 stuck on Apple logo problem caused by Touch ID? The situation can be much more complicated. In this article, REWA LAB will show exactly how to fix the iPhone 8 stuck on Apple logo problem with a completely new solution.

iPhone 8 Stuck on Apple Logo FIX

Power on, Apple logo displays normally. Yet the phone gets stuck on Apple logo and can’t boot up completely.

How To Fix iPhone 8 Stuck on Apple Logo

Connect the phone to computer and restore via iTunes. Then insert the SIM card and activate the phone.

How To Fix iPhone 8 Stuck on Apple Logo

The Home Button gets unresponsive with returning function and the phone fails to activate completely.

How To Fix iPhone 8 Stuck on Apple Logo

Disassemble the phone and disconnect the battery. Then remove the display assembly.

How To Fix iPhone 8 Stuck on Apple Logo

Measure the power supply voltage of Home Button. The measured voltage value is 3.3V, 1.8V and 2.75V. Normal voltage value for the three sets of voltage.

How To Fix iPhone 8 Stuck on Apple Logo

Check whether the 3D flex cable of the display assembly is damaged or not. The 3D flex cable is in normal status.

How To Fix iPhone 8 Stuck on Apple Logo

Detach the Home Button and check whether the home button flex cable is damaged or not. The home button flex cable is in normal status.

How To Fix iPhone 8 Stuck on Apple Logo

Since Home Button is connected to the logic board with flex cable on the display assembly, to further confirm the fault point, replace with a new display assembly. Get the Home Button mounted on the new display assembly. Buckle the new display assembly to the logic board. Then power on.

How To Fix iPhone 8 Stuck on Apple Logo

The phone still gets stuck on Apple logo and can’t boot up completely.

How To Fix iPhone 8 Stuck on Apple Logo

Preliminary judgment – Home button malfunction resulted in iPhone 8 stuck on Apple logo issue.

Remove the display assembly. Switch to diode mode and measure the resistance between J5800 pins and grounding. Normal resistance value. There are obvious repairing marks on J5800 under the microscope. So we can have the connector J5800 replaced for a try.

How To Fix iPhone 8 Stuck on Apple Logo

Take out the logic board and attach it to PCB Holder. Stick connectors next to J5800 with high-temperature adhesive tape.

How To Fix iPhone 8 Stuck on Apple Logo

Apply some BGA paste flux to the bonding pad and take down J5800 with Hot Air Gun at 320℃.

How To Fix iPhone 8 Stuck on Apple Logo

Then Solder tins with Soldering Iron. Which is helpful to the subsequent soldering process. Clean with PCB Cleaner afterward.

How To Fix iPhone 8 Stuck on Apple Logo

Apply some BGA paste flux to the bonding pad. Align the new connector to the right place. Then solder the new connector with Hot Air Gun at 320℃.

How To Fix iPhone 8 Stuck on Apple Logo

Wait for the logic board to cool for 5 minutes and then clean with PCB Cleaner. Check again to confirm soldering status.

How To Fix iPhone 8 Stuck on Apple Logo

Get the logic board assembled and connect the battery. Buckle the display assembly and power on. The phone gets access to the activating interface normally.

How To Fix iPhone 8 Stuck on Apple Logo

Insert the SIM card and activate the phone. The Home Button gets responsive with returning function. Yet Touch ID failed.

How To Fix iPhone 8 Stuck on Apple Logo

So we need to restore again via iTunes. Once finished, activate the phone again. Touch ID back to normal this time.

How To Fix iPhone 8 Stuck on Apple Logo

With a carrier lock built into the phone, take out the SIM card after the activating process. Only in this way can we move to subsequent function test.

How To Fix iPhone 8 Stuck on Apple Logo

Run function test. All going well. Fault cleared.

How To Fix iPhone 8 Stuck on Apple Logo

For more details on iPhone 8 Stuck on Apple Logo repair, please go to REWA YouTube channel.

Tools Used

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