26 May 2018

iPhone 7 Error 4013 - Baseband problem

Today got an iPhone 7 is having restore failed show Error 4013 in iTunes.

NOTE: This article is not suitable and is outdated when iOS 12 released. You can keep reading if you had an iPhone with this issue and didn't repair that time.

Article link about iPhone 7 and 7 Plus Baseband No Service Problem Repair for iOS 13.

(In September 2018, iOS 12 released. There won't be an error code to stop for restore. But you still stuck in activation mode. Unable to activate your iPhone)  

Customer said before it was working but just no service (network). Then he sent it to the previous shop, the guy restored the software and it ended with error 4013. Then it stuck at Recovery mode.

Older iOS will display different iTunes logo and Cable.

By hearing the client said it was No Service. We already know it got a network or signal issue.
it's a famous problem for iPhone 7 or iPhone 7 Plus. Same as iPhone 6 Plus touch disease.

This we called it  - iPhone 7 Baseband disease.

OK, for who googled about this issue and found this page. I'm going to share some tips here.
I'm telling you that DO NOT restore your iPhone. It never was a software issue. Definitely is a HARDWARE problem.

If you insist to restore it, then your iPhone will stuck in Recovery Mode (Happened in iOS 11 or earlier). So what so bad about it?
Can't gaming or use app? No!! The biggest problem is some shop they intend to swap your expensive part like camera with faulty one..  since your iPhone is unable to enter iOS, how are you going to check all the functions?

Most of them don't have the skill to do repair logicboard ic. So they swap out those cameras (7Plus camera worth a few hundred!) and might charge you for diagnosis fee which they just did software method that restores the device in iTunes. This type of technician without skills is usually gain profit by doing monkey trick.

We are a real advanced technician. Still seeing a lot this kind of case. The worse part is they created a mess. Causing us to repair their "damaged" and more time wasted.

Remember this - Second attempt repair would cost more than the 1st hand. Sent to the wrong shop will get consequences.

So I strongly suggest you keep the iPhone in a status that still can be turned on to see all functions or features.

By the way...Back to topic.
We have a few ways to check it before you conclude this is the problem you have.

How to know it is Baseband problem:

  1. If you haven't restore yet, go to the phone menu and press *#06# and then the IMEI will appear..
    If nothing appears after you press *#06#, then it's confirmed you having a Baseband problem.
  2. Try dial 112. It will show you call failed when baseband is not working. (This is an emergency call which must be able to call out even for a locked iPhone) 
  3.  Error 1 or -1 in iTunes restored failed. (This happened in iOS 11 or older)
  4.  Error 4013 (iPhone 6S, 6SP, 7, 7SP) in iTunes restore and then the iPhone stuck in recovery mode. (If it has no display and blank screen, then you have a bigger problem which is out of our today topic). 
Press *#06# then it show IMEI when the baseband CPU working

Let's talk about how to repair it and why did it happen.

First, I show you a photo below. It's an iPhone 7 which we removed the shield on top of the logic board. We can see the Apple logo chipset with text A10. It's the main CPU of the iPhone 7.

The red circle IC is Baseband CPU. (Its job is to control all the signal or cellular network) He is the protagonist of today's topic.
There are two types of iPhone 7 / 7P. One of them is using Qualcomm Baseband. The other one is Intel.
Both are the famous chipset makers. Which one better? I can't say. But I do have a statistic know which one failed the most.


Q: Why the problem happened?
A: Usually is because you dropped it too hard.

Q: WHY? My other iPhone doesn't have this kind of issue even if I dropped it many times.
A: This I can tell you. It is the design flaw.
Because the baseband IC is sitting middle of the logic board. In the very center. So when the iPhone7 fell hard on the floor, the logic board will get slightly bend in the middle causing the solder joint of Baseband CPU IC cracked or lost contact.

Q: So how to fix it?
A: Most of the cases, it just needs to reball the Baseband CPU with a better solder paste which is more durable than Apple. Sometimes even need to repair broken tracks below at this IC.
Whatever the problem, we still need to check by taking it out.


Make sure whoever you send to repair this, the shop must responsible for your iPhone to be still alive. If they can't promise then don't let them repair.

Because to do this job, the technician himself MUST BE very highly trained. Master heat control.

Why? Because CPU is sitting next to the Baseband CPU.
If we put too much heat, the A10 CPU beside will be shorted or died. 

Reball done. Put all the capacitors and Inductor back. Then check the surrounding with multi-meter.

After all the technical works are done. We just need to restore again.

When the white bar is passed 50%. And iTunes doing the second time of verifying iPhone restore. The problem is fixed.

YAY~ This is the message we love to see!! Restore completed.
Job done!

Tips: Always backup your data in iTunes even your iPhone has no problem.

Want us to repair this?
Check our business web site for the cost of repairing the Baseband issue.