iPhone X won't turn on hardeware repair guide - GSM-Forum

Diven · 07-06-2018, 11:22

When your iPhone won’t turn on, what can you do? The first step is to find the reason of iPhone won’t turn on, there could be any hardware or software issue related to your device. Such as physically damaged or dropped in water or some other reason, and there are many solutions form internet, such as charge your iPhone, restart, Hard restart, use software to fix… for these solutions, you can have a try, but here we will provide a high level and professional solution to fix iPhone won’t turn on.

I want to show a video here, but I found it isn't watched here, so if you want to watch the video, check this link, and the video is at the lasted of the page.

Disassemble

Disassemble the won’t turn on iPhone X. Take out the double layer motherboard. Here comes the first difficulty – separate the folded motherboard. which requires severely temperature controlling. Excessively high temperature would damage the components around, but too low temperature cannot separate them. With patience and time, we separate the logic board successfully.

Diagnosis

After the logic board was separated, connect the upper layer with DC Power Supply. The reading current is abnormal. So we locate the fault to the upper layer. To continue our diagnosis, we measure power supply voltage of the upper layer with Multimeter. And find out there is no voltage value on C2771 and C2770. Measure with Multimeter and we can confirm that the inductor L2770 is damaged.

Maintenance & Test

So we need to take down inductor L2770 and replace with a new inductor. Firstly, attach the upper layer to the PCB Holder. And stick High-Temperature Adhesive Tape on components around L2770 for protection. Then re-solder with a new inductor. After cooling down, measure the current value again via connect it with DC Power Supply. The measured current value on the ammeter is normal this time. Fault cleared.

Reassemble

Guess what? Here comes the most difficult part of the repair – to remove tins from the two layers separately. We transfer the direction for 5 times and finally finish the tin removing process. Then another difficult part – to reball the lower layer. We actually made it only at our second attempt. Eventually, we got re-solder the two boards and reassemble the phone, the iPhone X won’t turn on the issue was finally solved.

Yilia · 06-13-2019, 10:46

Maybe we can have physical damage or liquid check. If cannot, we can also ask a professional staff on Apple store for help. What's else, the more we can do is try to use an iOS system recovery tool to fix iPhone won't turn on in case there is a software-related issue. Or manage to force restart iPhone, restore with iTunes, etc.

07-06-2018, 11:22	#1 (permalink)
Diven Junior Member Join Date: May 2018 Location: US Posts: 24 Member: 2834468 Status: Offline Thanks Meter: 5	iPhone X won't turn on hardeware repair guide When your iPhone won’t turn on, what can you do? The first step is to find the reason of iPhone won’t turn on, there could be any hardware or software issue related to your device. Such as physically damaged or dropped in water or some other reason, and there are many solutions form internet, such as charge your iPhone, restart, Hard restart, use software to fix… for these solutions, you can have a try, but here we will provide a high level and professional solution to fix iPhone won’t turn on. I want to show a video here, but I found it isn't watched here, so if you want to watch the video, check this link, and the video is at the lasted of the page. Disassemble Disassemble the won’t turn on iPhone X. Take out the double layer motherboard. Here comes the first difficulty – separate the folded motherboard. which requires severely temperature controlling. Excessively high temperature would damage the components around, but too low temperature cannot separate them. With patience and time, we separate the logic board successfully. Diagnosis After the logic board was separated, connect the upper layer with DC Power Supply. The reading current is abnormal. So we locate the fault to the upper layer. To continue our diagnosis, we measure power supply voltage of the upper layer with Multimeter. And find out there is no voltage value on C2771 and C2770. Measure with Multimeter and we can confirm that the inductor L2770 is damaged. Maintenance & Test So we need to take down inductor L2770 and replace with a new inductor. Firstly, attach the upper layer to the PCB Holder. And stick High-Temperature Adhesive Tape on components around L2770 for protection. Then re-solder with a new inductor. After cooling down, measure the current value again via connect it with DC Power Supply. The measured current value on the ammeter is normal this time. Fault cleared. Reassemble Guess what? Here comes the most difficult part of the repair – to remove tins from the two layers separately. We transfer the direction for 5 times and finally finish the tin removing process. Then another difficult part – to reball the lower layer. We actually made it only at our second attempt. Eventually, we got re-solder the two boards and reassemble the phone, the iPhone X won’t turn on the issue was finally solved.

06-13-2019, 10:46	#2 (permalink)
Yilia Insane Poster Join Date: Jan 2018 Posts: 67 Member: 2797527 Status: Offline Thanks Meter: 4	Maybe we can have physical damage or liquid check. If cannot, we can also ask a professional staff on Apple store for help. What's else, the more we can do is try to use an iOS system recovery tool to fix iPhone won't turn on in case there is a software-related issue. Or manage to force restart iPhone, restore with iTunes, etc.