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Symptoms: After a screen or battery repair, the phone boot loops a few times during boot up, then never charges. The battery percentage stays at 1% or charges very, very slowly.
The Damage: There are some small components near the display/lcd connector that gets dislodged when the connector is disconnected from the logic board. More specifically, a zener diode (DZ3200) and a transistor (Q3200).
The Fix: Usually, some pads are also missing, so we’ll need to run some micro-jumpers to the missing pads and replace the missing components.
Watch our video on how to repair this problem using microsoldering.
ZXW Tools is the preferred software for iphone and ipad logic board repair. The dongle acts as a security key for the downloadable software. The software can be downloaded freely on their website, assuming you can read chinese :
Important update on 3/11/2017: The version 2.4 download file from the zxwtools.com website contains a keylogger trojan contained within a separate directory in the .rar file. See below:
Please make sure that you delete this directory once installed or you can just use the version 2.3. Better yet, download the file from our link below. We’ve removed the directory with the trojan from our compressed file. Thank you to Terry for pointing this out to us!
If you came here looking to download the software, then you’re in luck. We’re hosting the software for those that can’t read chinese or don’t know how to get a browser with translation.
You can download the ZXW Tools dongle software from the below link:
- ZXW Tools v2.5 + Blackfish v1.6 (latest version)
- ZXW Tools v2.4 + Blackfish v1.5
- ZXW Tools v2.3 + Blackfish v1.4 Download
- ZXW Tools v2.1 + Blackfish v1.4 Download
The schematics in the software are updated automatically when the program is run, so there is no need to download new software upon a new iphone or ipad release. New versions of the ZXW tools software are updated occassionally, but not often.
If you’d like to purchase ZXW Tools dongle, you may do so from our our online store.
Version 2.3 above is the latest version of the software as of July 22, 2016.
Updated January 24, 2017!
ZXW v2.4 + Blackfish v1.5 is out!
Updated September 28, 2017!
ZXW v2.5 + Blackfish v1.6 is out!
For those of you who own the Naviplus Pro3000 Nand programmer, here’s the latest update for the firmware v1.1302:
It’s easy to install. Just download and unrar the compress file. Move the NK.bin file to an SD or microSD card, then plug the card into the back of your Naviplus Pro3000. Turn on the programmer and click on “Soft Update” or “System Update” once you get to the main screen.
Looking for the User’s Manual? Here it is:Download
The iPhone 7 and iPhone 7+ have been plagued by a slow boot problem, usually after a screen repair. There are a list of culprits that could cause this problem. It seems as though after the iOS 11 update, the software checks all of the major hardware on the iPhone and if there is a problem detected, then the phone goes into a very sluggish state, taking forever to boot and when it does boot up to the home screen, the phone sometimes freezes.
We’ve seen a lot of these lately. The usual culprits are:
- Cheap aftermarket front camera flex
- Torn or ripped home button flex or U10 chip
- Cracked wifi flex or chip
- Audio IC disease
- No service/searching baseband IC issue – error 4013
I’ll go into a little more detail about these problems.
Cheap Aftermarket Front Camera Flex
Original front camera flexes for the iphone 7 and 7+ are hard to come by. Unfortunately, there are have been cheaper aftermarket flexes that, when used, result in loss of audio or slow boot problems. The best thing to do is to always try a known good (original) front camera flex along with a new screen to rule out the front camera flex as being the problem to the slow boot.
Sometimes a torn original front camera flex causes the slow boot as well. So, as a screen repair shop, you should have a fully assembled known good working screen along with all of the small parts (except for the home button, which will need to be transferred) already on it.
Torn or Ripped Home Button Flex or U10 Chip
Another common problem is a ripped home button flex or cracked U10 chip on the home button flex. The U10 chip handles the home button press along with the heptatic feedback. Before the iPhone 7 and iPhone 7+, we, as cell phone repair techs, were always taught to lift the screen with the iSesamo from the bottom left of the housing. Well, with the iPhone 7/7+, the home button flex and U10 chip are located right at the bottom left of the screen. When the iSesamo goes in to lift the screen, what often happens is that the metal pry tool rips the flex and/or digs too deep and cracks the U10 chip. Sometimes the slightly torn flex is barely noticeable, but you’ll know if there is a problem when the home button and/or finger print doesn’t work after the screen repair.
Also, if the original home button is not connected to the logic board, then the phone will also be slow to boot. To fix all of these problems, we can replaced the U10 “Turtle” chip through microsoldering and run traces for the torn home button flex. If the flex is completely ripped, then there is no way to fix all of the torn traces. To prevent this problem, just lift the screen from the bottom right side of the screen or use a plastic pry tool.
Cracked Wifi Flex or Chip
The wifi flex is located at the top of the logic board and housing. What we’ve seen happen is that when the front camera flex holding plate is unscrewed from the logic board, the screwdriver slips and either cracks the wifi chip or damages the flex. When this happens, the wifi flex can be reconnected to the logic board, but the phone will be slow to boot and after bootup, the screen sometimes freezes. The fix is to visually inspect the wifi flex and replace, if necessary.
Audio IC Disease
We coined the term “audio ic disease” as a play off of the dreaded “touch ic disease” affecting the iphone 6/6+. Similar to touch ic disease, audio ic disease is when one of the traces under the audio ic disconnects from the logic board, either through corrosion or bending. There is really no way to determine whether the C12 pad has actually disconnected from the logic board, so the best way to determine whether this is the problem is to open up the voice memos app and see if the red record button is grayed out or not. Just make sure that you rule out the front camera flex first. If the front camera flex is ruled out, then the most likely problem is audio ic disease. The fix is to replace or reball the audio ic chip and run a micro-jumper to the c12 pad.
No Service/Searching Baseband IC Issue – Error 4013
We’ve been seeing a lot more of these lately. Most notably in the A1660 model of the iPhone 7, which is the CDMA version. This problem doesn’t usually cause the slow boot or freezing, but more often a “searching/no service” cell signal issue and/or an error 4013 upon update or restore. Usually the phone is unusable after a failed restore. As a matter of fact, Apple has just issued a free replacement if this happens to your phone. We’ve determined that one of the problems is a short in the baseband chip itself. We’ve also seen a short around the baseband PMU IC, which handles the power to the baseband chip. Sometimes this problem is repairable, sometimes it’s not. There’s really no way to tell aside from opening the phone and using a multimeter to locate the problem.
Here is a video of us diagnosing and repairing the slow boot, freezing, hanging, no audio problem in the iphone 7.