How To Fix an iPhone 11 Pro That Randomly Restarts and How To Fix an iPhone SE 2020 That Randomly Restarts: Difference between pages

How To Fix an iPhone SE 2020 That Randomly Restarts
Device	iPhone SE 2020
Affects part(s)	Main Logic Board
Needs equipment	Screwdrivers, known good parts, spudger
Difficulty	◉◉◌◌ Medium
Type	Part replacement

Revision as of 22:10, 5 November 2023

Problem description

There are many reasons that could cause an iPhone SE 2020 (2nd Gen) randomly restart every few minutes. For the iPhone SE 2020 there are some sensors within the parts of the phone that are required to be plugged in & detected. Otherwise, the phone restarts on its own.

The most common for iPhone SE 2020 is:

Bad or Defective Battery - If the phone is not showing a percentage at the top of the screen, it means the battery data isn't being read by the device, causing the device to restart. So if you see your iPhone SE 2020 says it's charging at 0%, that could be why it's restarting.

Charging Port Flex - This is the flex towards the bottom of the phone which is slightly exposed behind the back glass. It is easily damaged with a drop & broken back glass, or by a technician during a back glass repair.
Motherboard Issue - There is a common fault on these logic boards, causing the 3 min restart issue. It's due to a defect in the logic board.

Symptoms

After a back glass repair, the iPhone will restart on its own every few minutes
After a hard drop & the back glass breaks, the phone will restart every 3 min.
After a battery replacement, the iPhone will bootloop every 3 minutes
After replacing the charging port flex, the device will auto restart on its own randomly.
The iPhone will reboot randomly when using it.
The iPhone will seem to freeze and restart every 2-5 minutes.

Solution

Diagnostic Steps

Before you start blindly replacing parts, it's important to try to confirm what is causing the restarting issue by reviewing the Panic Log file. This is a file that is generated by the Operating System, to document the fault causing the restart.

An example of panic log files you'll find in the iPhone when it has been randomly restarting.

To find the panic log on the device, go to Settings-> Privacy-> Analytics & Improvements-> Analytics Data-> Scroll down to the files starting with "panic-full..." & click on the most recent dated file.

Then you'll want to scan through the text for keywords that may point you to the cause.

For this model, look for where it says "Missing Sensors:.."

An example panic log, showing "Missing sensors: Prs0", which means it has a bad charging port flex.

If you see:

TG0B or TG0V - It's battery related:
- The battery is defective or has failed
- The battery connector itself is damaged, warped or broken
- The battery connector data lines are missing.
  - Check the mosfets Q3201 or Q3200 to see if broken or damaged
  - Check the battery data pins (I2C3_SMC_TO_GG_SCL_CONN and I2C3_SMC_BI_GG_SDA_CONN) for a diode mode reading. If it's OL, then there's a disconnected line & it'll need to be investigated

Mic1 - When it's related to the charging port flex
- Test with known good charging port flex. Replacement flex cables can be defective & very common, especially if it's an iPhone 8 charging port flex, it may cause restart issues on iPhone SE 2020
Mic1 - When it's a broken trace within the motherboard
- Refer to this guide for more details: IPhone SE 2020 3 Long Jumper Solution To Fix No Touch and 3 Min Restart
  - Diode Mode the charging port FPC & check these 2 pins (I2C1_AP_SDA & I2C1_AP_SCL), as they're the Mic1 data lines. If you see one or both as OL, then you have the common logic board defect. There is a break somewhere underneath the SIM Tray. So the solution would be to run a jumper around it to bypass it. Here's how:
    - I2C1_AP_SCL - Run a long jumper from R6610 to pin 13 on the charging port FPC. If done correctly, you should have a Diode Mode value of .329V at the charging port FPC
    - I2C1_AP_SDA - Run a long jumper from R6611 to pin 15 on the charging port FPC. If done correctly, you should have a Diode Mode value of .329V at the charging port FPC

Alternatively, you can use a tool like the iDevice Panic Log Analyzer, which will download the panic logs from the device & display them on the PC & give you suggestions to possible solutions. It makes it easier to browse the panic log file.

Also, check out www.PanicFull.com which allows you to upload the panic log file & have it analyzed for free.

Both of these tools just give suggestions, which aren't always correct, as there is no official solution list from Apple. So many solutions are just suggestions based on hearsay, rumors or just guesses.

For situations where you don't see the above examples, you'll have to read through the top portion of the panic log & try to decipher what could be the root cause. Look for keywords you may recognize.

Repair Steps

When trying to solve for these issues, make sure to replace the appropriate flex with an OEM or Premium flex.

It is also a good idea to keep a known good parts on your bench, for testing only. There are reports of even NEW parts being bad. So you have to keep known good flexes on hand at all times, so you don't waste your time troubleshooting with possibly bad flexes.

In scenarios where you have the appropriate flexes plugged in, but it still restarts, then you either have:

Bad or damaged flex
Low quality aftermarket flex
Other flex cables that are Liquid Damaged

Please note: You MUST have the required flex cables, plugged in. Otherwise, it WILL restart. You cannot troubleshoot this step by unplugging the bad flex.

@@ Line 1: / Line 1: @@
 {{Repair Guide
-|Device=iPhone 11 Pro, iPhone 11 Pro Max
+|Device=iPhone SE 2020
 |Affects parts=Main Logic Board
-|Needs equipment=Screwdrivers, known good parts, spunger
+|Needs equipment=Screwdrivers, known good parts, spudger
 |Type=Part replacement
-|Difficulty=1. Easy
+|Difficulty=2. Medium
 }}
-{{stub}}
+==Problem description==
+There are many reasons that could cause an iPhone SE 2020 (2nd Gen) randomly restart every few minutes. For the iPhone SE 2020 there are some sensors within the parts of the phone that are required to be plugged in & detected. Otherwise, the phone restarts on its own.
-==Problem description==
+The most common for iPhone SE 2020 is:
-There are many reasons that could cause an iPhone 11 Pro or iPhone 11 Pro Max randomly restart every few minutes. For the iPhone 11 Pro or Pro Max, there are some sensors within the parts of the phone that are required to be plugged in & detected. Otherwise, the phone restarts on its own.
-The most common for iPhone 11 Pro series are:
+*'''Bad or Defective Battery''' - If the phone is not showing a percentage at the top of the screen, it means the battery data isn't being read by the device, causing the device to restart. So if you see your iPhone SE 2020 says it's charging at 0%, that could be why it's restarting.
-*'''Bad or Defective Battery''' - If the phone is not showing a percentage at the top of the screen, it means the battery data isn't being read by the device, causing the device to restart. So if you see your iPhone 11 Pro says it's charging at 0%, that could be why it's restarting.
 *'''Charging Port Flex''' - This is the flex towards the bottom of the phone which is slightly exposed behind the back glass. It is easily damaged with a drop & broken back glass, or by a technician during a back glass repair.
-*'''Damaged or Defective Power Button''' - There is a secondary mic (mic2) that is on the power button flex. It is easily damaged, especially after back glass repair, causing the mic to be disconnected & the phone will restart when it's not detected.
+*'''Motherboard Issue''' - There is a common fault on these logic boards, causing the 3 min restart issue. It's due to a defect in the logic board.
 ==Symptoms==
 *After a back glass repair, the iPhone will restart on its own every few minutes
-*After a battery replacement, the iPhone will boot-loop every 3 minutes
+*After a hard drop & the back glass breaks, the phone will restart every 3 min.
+*After a battery replacement, the iPhone will bootloop every 3 minutes
 *After replacing the charging port flex, the device will auto restart on its own randomly.
 *The iPhone will reboot randomly when using it.
 *The iPhone will seem to freeze and restart every 2-5 minutes.
 ==Solution==
 ===Diagnostic Steps===
-Before you start blindly replacing parts, it's important to try to confirm what is causing the restarting issue by reviewing the Panic Log file. This is a file that is generated by the Operating System, to document the fault causing the restart.[[File:Panic Log List.png|thumb|An example of panic log files you'll find in the iPhone when it has been randomly restarting.|link=https://repair.wiki/w/File:Panic_Log_List.png]]To find the panic log on the device, go to Settings-> Privacy-> Analytics & Improvements-> Analytics Data-> Scroll down to the files starting with "panic-full..." & click on the most recent dated file.
+Before you start blindly replacing parts, it's important to try to confirm what is causing the restarting issue by reviewing the Panic Log file. This is a file that is generated by the Operating System, to document the fault causing the restart.[[File:Panic Log List.png|thumb|An example of panic log files you'll find in the iPhone when it has been randomly restarting.]]To find the panic log on the device, go to Settings-> Privacy-> Analytics & Improvements-> Analytics Data-> Scroll down to the files starting with "panic-full..." & click on the most recent dated file.
+Then you'll want to scan through the text for keywords that may point you to the cause.
-Then you'll want to scan through the text for keywords that may point you to the cause.
+For this model, look for where it says "Missing Sensors:.." [[File:Panic Log Prs0.png|thumb|An example panic log, showing "Missing sensors: Prs0", which means it has a bad charging port flex.]]If you see:
-For this model, look for where it says "Missing Sensors:.."
-If you see:
 *'''TG0B or TG0V''' - It's battery related:
 **The battery is defective or has failed
 **The battery connector itself is damaged, warped or broken
-**Check the battery connector on the charging port flex
+**The battery connector data lines are missing.
-**The battery connector data lines are missing.
+***Check the mosfets Q3201 or Q3200 to see if broken or damaged
-***Check the battery data pin ('''PMU_TO_BATTERY_SWI''') for a diode mode reading.
+***Check the battery data pins ('''I2C3_SMC_TO_GG_SCL_CONN''' and '''I2C3_SMC_BI_GG_SDA_CONN''') for a diode mode reading.  If it's OL, then there's a disconnected line & it'll need to be investigated
-*'''Prs0 or Mic1''' - It's the charging port flex.
+*'''Mic1''' - When it's related to the charging port flex
-**Test with known good charging port flex.
+**Test with known good charging port flex. Replacement flex cables can be defective & very common, especially if it's an iPhone 8 charging port flex, it may cause restart issues on iPhone SE 2020
-**Check for damaged or missing resistors around the charging port connector
+*'''Mic1''' - When it's a broken trace within the motherboard
-*'''Mic2''' - It's related to the mic on the power button flex
+**Refer to this guide for more details: [[IPhone SE 2020 3 Long Jumper Solution To Fix No Touch and 3 Min Restart]]
-**Test with a known good power button flex
+***Diode Mode the charging port FPC & check these 2 pins ('''I2C1_AP_SDA''' & '''I2C1_AP_SCL'''), as they're the Mic1 data lines. If you see one or both as OL, then you have the common logic board defect. There is a break somewhere underneath the SIM Tray. So the solution would be to run a jumper around it to bypass it. Here's how:
-**Check for pry damage on all the small components near the connector
+****'''I2C1_AP_SCL''' - Run a long jumper from R6610 to pin 13 on the charging port FPC.  If done correctly, you should have a Diode Mode value of .329V at the charging port FPC
-[[File:Panic Log Prs0.png|thumb|An example panic log, showing "Missing sensors: Prs0", which means it has a bad charging port flex.|link=https://repair.wiki/w/File:Panic_Log_Prs0.png]]
+****'''I2C1_AP_SDA''' - Run a long jumper from R6611 to pin 15 on the charging port FPC.  If done correctly, you should have a Diode Mode value of .329V at the charging port FPC
 Alternatively, you can use a tool like the [https://github.com/waynebonc/iDeviceLogAnalyzer-public iDevice Panic Log Analyzer], which will download the panic logs from the device & display them on the PC & give you suggestions to possible solutions. It makes it easier to browse the panic log file.
-Also, check out [https://www.panicfull.com/ www.PanicFull.com] which allows you to upload the panic log file & have it analyzed for free.
+Also, check out [https://Www.PanicFull.com www.PanicFull.com] which allows you to upload the panic log file & have it analyzed for free.
 Both of these tools just give suggestions, which aren't always correct, as there is no official solution list from Apple. So many solutions are just suggestions based on hearsay, rumors or just guesses.
 For situations where you don't see the above examples, you'll have to read through the top portion of the panic log & try to decipher what could be the root cause. Look for keywords you may recognize.
 ===Repair Steps===
 When trying to solve for these issues, make sure to replace the appropriate flex with an OEM or Premium flex.
@@ Line 60: / Line 63: @@
 In scenarios where you have the appropriate flexes plugged in, but it still restarts, then you either have:
 *Bad or damaged flex
 *Low quality aftermarket flex
 *Other flex cables that are Liquid Damaged
 Please note: You MUST have the required flex cables, plugged in. Otherwise, it WILL restart. You cannot troubleshoot this step by unplugging the bad flex.