Fix unresponsive iPhone X
Duration: 45 minutes
Steps: 4 Steps
Step 1
- Hop into Settings and tap on Sounds & Haptics. Smooth sailing so far.
- With your screen lit up, ring the phone from another working device. You’ll spot the decline and answer buttons popping up as expected.
- Now, shut off the screen and call the phone again. If it’s not reacting at all, tap the power button to wake the screen—bam, the decline and answer buttons are back in action.
Step 2
- Looks like some of the circuits responsible for the baseband wake signal decided to take a nap. Time to open up the phone! Start by disconnecting the battery, then carefully remove the display assembly and take out the motherboard.
- Secure the motherboard in the PCB Holder. Use a Hot Air Gun set to 200℃ with an airflow of 3 to warm it up. Gently peel off the heat dissipation sticker from the back of the motherboard.
- Fire up your bitmap software and find BB_TO_PMU_PCIE_HOST_WAKE_L. Since the usual wake signal circuits are giving us trouble, let's borrow the wake signal from the WiFi circuit to get things moving.
- Next, locate WLAN_TO_PMU_HOST_WAKE. You'll connect PP101_E-1 (the baseband wake signal test point) to PP7611_W-1 (the WiFi wake signal test point) by bridging them with a jumper wire.
Step 3
- First things first, carefully scrape off the insulating coating on those two test points. Next, spread a little solder paste onto the two bonding pads. Fire up your soldering iron to 365℃ and give those pads a nice tinning with the solder paste.
- Now, connect PP101_E-1 to PP7611_W-1 using a 0.02mm enameled copper wire. Keep it steady and precise!
Step 4
- Brush that wire with the UV Curable Solder Mask—give it a nice even coat, like sunscreen for your circuit.
- Time to put your phone back together and give it a spin. Try it out with the screen off first—if everything’s working, you’ve cleared the fault! If not, no worries. If things get tricky, you can always schedule a repair.
