Water damage is a common issue for iPhone in daily use. In this video, the home button of iPhone 7 is not working after water damaged, because lines on logic board get corroded and damaged. Since there is a high failure risk in repairing, REWA LAB presents you a method to fix heavily corroded and damaged logic board step by step by Ultrasonic Cleaner and making jumper wire. To fix your iPhone 7 home button issue caused by water damage, please follow the repair operations of our tutorial video.
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.
iPhone X, with its super-sized display, latest biometric technology – Face ID, most durable glass, wireless charging and so on, hits the heart of the majority upon its release in October 2017.
However perfect it is, it shows malfunctions as time goes by.
In the beginning, it has malfunctions of unresponsive touch, stuck screen, and other display issues. Lately, some logic board malfunctions show up. For example, iPhone X won’t turn on etc,.
If you get to know the structure of iPhone X logic board, you should know iPhone X logic board was folded in half, and the two layers then were soldered together – the upper layer is the main board, and the lower layer is the signal board.
Which made our repair much difficult to proceed.
Today, we share a repair case of iPhone X won’t turn on logic board repair. Let’s see which is the hardest part.
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.
iPhone won’t turn on and the screen is black or frozen? After software issue being excluded, the problem may be caused by a faulty logic board. Since logic board of iPhone X is a single one that’s basically been folded over and soldered together, the unique design and structure have made any repairs to the logic board far more difficult than previous series. With our iPhone X won’t power on repair case today, the fault has been confirmed as inductor damage by voltage measurement. And we can fix the iPhone X won’t turn on issue by inductor replacing and board re-soldering.
Just 4 steps to fix your iPhone x won’t turn on.
1. 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.
2. 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.
3. 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.
4. 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 issue was finally solved.
Recently, REWA has received feedback from several third-party repair shops regarding issues with the ambient light sensor not working on some iPhone 8 series and iPhone X devices after repair. After conducting tests and analysis, REWA LAB has discovered that Apple may have implemented technical barriers to prevent customers from seeking third-party repairs. Watch the video to see the testing procedures and results.
What should you do if your iPhone 7 won’t turn on after being dropped?
The problem may be caused by a software crash or a complicated hardware issue.
We have published an iPhone 6 won’t turn on and iPhone X won’t turn on guide video, and this time, we received an dropped iPhone 7 Plus which cannot turn on.
The problem was finally detected as CPU being short-circuited. Here we have detailed troubleshooting procedures.
iPhone 7 won’t turn on Diagnosis
Take apart the phone and disconnect the battery, then connect the phone with the DC Power Supply and press the power button to power on.
The current reading of the ammeter jumps to 350mA and then stays still, which is abnormal and indicates that the logic board is short-circuited.
disassemble the phone and detach the battery
Disconnect the power supply and take out the logic board.
Run diode measurements on capacitors around power IC one by one.
All the values are normal except C1823 – It displays 0, which indicates that C1823 is short-circuited.
From the schematics, we can see that C1823 is the filter capacitor of PP1V8-SDRAM, and it is directly connected to CPU SDRAM.
diode measurements on capacitors around power IC Repair
Attach the logic board to the PCB Holder, and take down the shielding cover by heating with Hot Air Gun, then remove CPU SDRAM with CNC Chip Grinding Machine.
After chip grinding, attach the logic board to the PCB Holder and clean it with PCB Cleaner, then remove the black adhesive around with Sculpture Knife.
After that, apply some BGA Paste Flux to the bonding pad.
Align the new SDRAM to the right place(Don’t reverse the direction), and then solder with Hot Air Gun. After cooling for 5 minutes, clean thoroughly with PCB Cleaner.
CPU SDRAM chip grinding Testing
Connect the phone with the DC Power Supply, then short Pin 13 of J4504 to the ground with the tweezer to trigger the power on the system.
This time, the current reading on the ammeter is normal.
connect the phone with the DC Power Supply
Get the logic board assembled and buckle the display assembly.
Connect the phone to the computer, then press and hold volume down and power button to get into DFU mode. Restore the phone via iTunes.
Once done, insert the SIM card and activate the phone.
After testing, All the functions work normally.
current reading on the ammeter
For more details about iPhone 7 won’t turn on repair and iPhone repair videos, please check our YouTube video.
Need cell phone repair replacement parts or tools?
REWA offers wholesale and retail mobile phone repair parts/tools with affordable prices for 10 years. Welcome to check our online store shop.rewa.tech.
iPhone 7/7 Plus won’t turn on after it is dropped? Due to the imperfect technology of CPU supplier, the SDRAM of iPhone 7/7 Plus series can be easily damaged. Once dropped, the SDRAM might be short-circuited and the phone won’t turn on afterward. Let’s click the video to know how we fix iPhone 7 plus won’t power on the issue in a more efficient way.
Diagnosis
Take apart the phone and disconnect the battery, then connect the phone with the DC Power Supply and press power button to power on. The current reading of the ammeter jumps to 350mA and then stays still, which is abnormal and indicates that the logic board is short circuited.
Disconnect the power supply and take out the logic board. Run diode measurements on capacitors around power IC one by one. All the values are normal except C1823 – It displays 0, which indicates that C1823 is short-circuited. From the schematics, we can see that C1823 is the filter capacitor of PP1V8-SDRAM, and it is directly connected to CPU SDRAM.
Attach the logic board to the PCB Holder, and take down the shielding cover by heating with Hot Air Gun, then remove CPU SDRAM with CNC Chip Grinding Machine. After chip grinding, attach the logic board to the PCB Holder and clean it with PCB Cleaner, then remove the black adhesive around with Sculpture Knife. After that, apply some BGA Paste Flux to the bonding pad. Align the new SDRAM to the right place(Don’t reverse the direction), and then solder with Hot Air Gun. After cooling for 5 minutes, clean thoroughly with PCB Cleaner.
Testing
Connect the phone with the DC Power Supply, then short Pin 13 of J4504 to the ground with tweezer to trigger the power on system. This time, the current reading on the ammeter is normal.
Get the logic board assembled and buckle the display assembly. Connect the phone to the computer, then press and hold volume down and power button to get into DFU mode. Restore the phone via iTunes. Once done, insert the SIM card and activate the phone. After testing, All the functions work normally.
iPhone 6s overheating and getting hot? Usually the problem is caused by excessive running apps, but in this tutorial video, we demonstrated a logic board repair method. After current detecting and rosin detecting, we can confirm that the problem was caused by damaged capacitors inside the WiFi module. With our repairing experience, we adopt a exclusive repair solution to fix the iPhone 6s high temperature warning screen issue.
Have you ever encountered with a problem of iPhone 6 no speaker sound while receiving dialing or playing music via louder speaker, and if you plug EarPods in, the sound come out again? This iPhone speaker no sound problem may be caused by some components pseudo soldering while the iPhone leaving factory. As time goes by, operating environment and personal habits of users may acceleratethe oxidation or shedding of pseudo soldered components. Let us check the video and find out how to fix iPhone speaker not working problem.
Have you checked our newly released about cracked iPhone 7 screen repair tutorial?
It is worth to take a look. Compare to iPhone 7, iPhone 8 and iPhone X look gorgeous, but also make them vulnerable, especially the back glass.
The fragile back glass is long reported extremely difficult to repair and may cost you more than expected due to the new design with wireless charging, embed camera and stubborn glue.
Have no idea about how to start your repair?
Don’t be frustrated. After the iPhone X OLED screen glass-only repair guide ,REWA here rolls out a new and quick solution for iPhone 8 and iPhone X back glass repair .
iPhone 8 broken back glass
Damaged Back Glass iPhone 8 back glass is damaged but still comes with normal wireless charging.
iPhone 8 wireless charging
DisassemblingTake down the display assembly.
Remove the screws, rear camera, logic board, louder speaker and taptic engine, then take out the battery and disconnect the charging port flex cable.
Remove the wireless charging coil by heating with Hot Air Gun , and disconnect the power switch volume flex cable.
Disassemble the iPhone 8
Back Glass Repairing
Pour adequate dispergator into the container of Ultrasonic Cleaner, then soak the back glass in the container and get the lid on. Set the time of the Ultrasonic Cleaner at 30m , and temperature at 60℃ .
After 30 minutes, take out the glass back.
Separate the broken back glass from the middle frame with Pry Sheet.
In case the broken glasses hurt your hands, please clean the table and be careful during the separating process.
Remove the glue residue on the middle frame with Razor Blade and clean it with N-hexane.
So far back glass separating completed without any injuries on the sides.
Apply some glue to the middle frame and spread it evenly.
After that, align the rear camera to the right position, then apply pressure and attach the back glass to middle frame tightly.
Once done, clean the glue residue.
Apply glue on the middle frame
ssemble the phone and test, and the phone runs normally with wireless charging.
For more details about iPhone 8/X Back Glass Repair, please check our video guide.
Now you can order Tools & Parts used in this video on our online shop.
Any questions about these replacement parts/tools, or need assistance when placing your order, please contact us at sales@rewatechnology.com and we will help you ASAP.
iPhone 6 keeps searching for signal? There are many possibilities for the causes of iPhone showing “searching” issue. As soon as they see “Searching”, a lot of people assume the built-in antenna on their iPhone is broken and head straight for the Apple Store. While it’s true that a defective internal antenna can cause the iPhone searching problem, it is by no means the only cause. You may try to figure it out by replacing a new SIM card, restarting the phone or resetting the network.
What if these do not work? This video introduced a logic board solution to fix iPhone 6 constantly searching for network. Let’s check the video for the detailed tutorial.
How To Fix An iPhone That Says Searching
We’ll walk you through the process of troubleshooting an iPhone that says iPhone searching for network, and help you fix the problem, if it can be fixed.
We structure our articles with the simple fixes first, and then we move on to the more complicated fixes if and when they become necessary. If we discover there really is a hardware problem with your iPhone, you can watch our video and we will steps to teach you how to repair your iPhone keeps searching for service.
1.Turn your iPhone off turn on again
This is a simple and necessary steps, when you turn on your iPhone again and then you need to check if your iPhone can search the signal?
2. Update your carrier settings
Sometimes wireless carriers release software updates that change the way your iPhone interacts with the cellular network. Sometimes, these updates fix problems that can cause your iPhone to say “Searching…” all the time.
3. Reset Network Settings
Reset Network Settings restores your iPhone’s cellular data configuration back to factory defaults. It’s an easy way to eliminate the possibility that an accidental change in the Settings app is preventing your iPhone from connecting to the network.
4.Fix Problems With Your SIM Card
All iPhones have a tiny SIM card that wireless carriers use to identify specific iPhones on their network. Your SIM card gives your iPhone your phone number – it’s what tells your carrier you’re you. SIM card problems are a common reason why iPhones say “Searching for service”.
If these steps are not solve your iPhone keeps searching for service, so it means your hardware is broken, you can watch our video to help you solve this question.
With up to 15 steps within the laminating process, iPhone X glass only screen repair is much more complicated than LCD screen of previous iPhone models. In consideration of the $279 official maintenance cost of broken screen and tough supply of China-made screen replacements in the short term, REWA LAB is honored to present you our hard-earned success with iPhone X OLED screen refurbishing.
Plus: For those in need, REWA also provides refurbishing service for models from iPhone 5 to iPhone X. Please feel free to contact us.
iPhone 8 stuck on Apple logo with an unresponsive home button? Why and how? Different from previous versions, there is a built-in hardware detection during booting process for iPhone 8. Once touch ID gets malfunctioned, the phone will hang on Apple logo during startup and won’t turn on. If you are troubled with the same problem that iPhone 8 can not be activated, check this video for the solution!
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