Best replacement way for iPhone 11 Pro Max A13 RAM

Here is a replacement way for replacing iPhone iPhone 11 Pro Max A13 upper layer. Use screwdriver to remove the screws at the bottom of the iPhone screen, open the screen with a LCD sucker. Remove the iPhone display screen, disconnect the battery, and then take out the iPhone 11 Pro Max motherboard.

Put iPhone 11 Pro Max motherboard to the SS-T12A heating station for separating the board, take off the iPhone 11 Pro Max motherboard upper layers, and attach it to the MJ K30 PCB holder.

Put iPhone motherboard under a Stereo Zoom Microscope to observe the A13 SDRAM, it looks good. Now use QUICK 861DW hot air gun and CPU removal blade to remove the A13 SDRAM, insert the blade from the right corner of the A13 CPU, and then slide to the top right corner. Once the SDRAM has been removed, next we need to remove the glue.

Use BGA removal blade to remove the glue on the CPU, and then clean it with PCB cleaner. Now connect the iPhone 11 Pro Max motherboard to the DC power supply to measure the current, after measurement, the current is normal.

Place the A13 upper layer to the right position, and then use hot air gun to install it back the motherboard.

Once down, cooling the motherboard, and then install the iPhone 11 Pro Max.

Press the iPhone power button, the iPhone 11 Pro Max turns on properly, and then test the iPhone functions, everything works well.

Drop-damaged iPhone XS Max Face ID not working- Fixed

 Here is a drop-damaged iPhone XS Max, the result is that the iPhone XS Max Face ID is not working. How to fix it?

First, we need to disassemble the iPhone XS Max. Use phone screen opening tools to disassemble the iPhone XS Max, remove the iPhone XS Max display screen and iPhone battery, and then take out the iPhone XS Max motherboard.

Use SS-T12A heating station to separate the iPhone XS Max motherboard, and then put it on the iSocket test fixture.

Use digital multimeter to measure the resistance value for iPhone XS Max Face ID connector, when we measured the 17 Pin of the infrared camera, we found it had no resistance value, but the value for the 15 Pin was normal, which is why the iPhone XS Face ID doesn't works. The circuit between the iPhone CPU and iPhone infrared camera 17 Pin are virtual-welded or disconnected.

Now we need to remove the glue for iPhone CPU, put iPhone motherboard under a microscope, and then use BGA graver blade to remove the glue around the CPU.

Apply some solder paste around the CPU, and then use QUICK 861DW hot air gun and BGA graver blade to remove the iPhone CPU. After the iPhone CPU is removed, use soldering iron to handle the residual glue on the solder pad, and then use JBC CD-2SHE soldering iron to solder a jump wire from 17 Pin to test if the circuit between iPhone CPU and iPhone infrared camera 17 Pin are disconnected.

After soldering, measure it with digital multimeter, the data tested is normal, now we confirm that the iPhone CPU is virtually welded, we need to re-install the iPhone CPU.

Reballing the iPhone CPU, and then install the iPhone CPU back to the motherboard. After the motherboard is cooled, use digital multimeter to measure the 17 Pin, now the resistance value is back to normal.

Next, use iSocket test fixture to test it, the iPhone XS Max Face ID tested is normal. At last, install the iPhone XS Max.

Solution: iPhone X restarts automatically after water damage

The iPhone X restarts automatically after water damage, when playing music or turn on speaker, it shuts down and restarts automatically. Here is solution to fix it.

Use screwdrivers to remove the screws at the bottom of the iPhone screen, and then put iPhone X on the CPB screen separator for heating, after a while, use screen pry tools to open the iPhone screen. Remove the iPhone X display assembly, disconnect the iPhone X battery and then take off the iPhone X motherboard.

Separate the iPhone X double layer board. Attach the iPhone X motherboard to the G-LON PCB holder fixture, use hot air gun and BGA graver to separate the board, use tweezers to remove the upper board.

Put iPhone X motherboard under a microscope, and continue to observe it, we found the iPhone front audio IC and iPhone ringtone IC are damaged, we need to replace them.

Carefully use QUICK 861DW hot air gun and tweezers to remove the iPhone front audio IC and iPhone ringtone IC, apply some solder paste to the solder pad, and then use DES H95 Phone rework station to solder these 2 chips back the motherboard.

Now re-soldering the iPhone X upper layer board and lower layer board, and then assemble the iPhone X. Turn on the iPhone X and test it, when playing the music or turn on speaker, the iPhone X still working properly.



After testing for a day, everything goes well on the iPhone X.

iPhone screw location diagram map and related screw numbers

How to get the iPhone screw location diagram map and releate screw numbers? Here we can get it.  Here are iPhone screw location map and releate screw numbers for iPhone XS Max, XS, X, 8, 7, 6.

Because the iPhone motherboard is too precise, once a screw was installed incorrectly, it can cause problems for the iPhone, such as the iPhone back cover can't be covered, damage the iPhone screen, or even damage the iPhone motherboard, so we need numbered the iPhone screws and make the iPhone screws location diagram.

As we know that there are 64 to 84 screws on an iPhone, which including 26 to 38 different models. For example, the iPhone XS has 58 screws, in 38 different models, different sizes, length, and screw hole. Therefore, it's very important to know the correct positions of the screws on the iPhone; we have to know exactly where each screw corresponds to the phone, that's why we marked the number for the screws.

We put each screw model will be pack in a separate bags, the users just need to choose the screws by following the iPhone screw location diagram, so you won't use the wrong screws model on the iPhone. And finally, you won't damage the iPhone because of the wrong screw.

And we mark the screws with a physical marking method, classify and number all screw models from iPhone 6 to iPhone XS Max, and make them into a corresponding high-definition screw location diagram.

Finally, you can select the correct numbered screw against the iPhone screw map, so you can install it correctly.

Solved: iPhone XR 4G Network Unstable

Here is an iPhone XR with 4G netowrk problem, 4G signal on the iPhone XR is not stable, it always turns to 2G. How to solve tihs problem?

Use phone opening toosl to disassemble the iPhone XR to remove the iPhone XR motherboard. Observing the iPhone motherboard, we can see that the iPhone baseband part, the medium frequency part and the amplifier IC has been repaired.

Fixed the iPhone XR motherboard by a MJ A22+ PCB fixture, and then remove the iPhone NAND flash. Put it under the Black Trinocular Microscope, use BGA scraper blade to remove the black glue, and then remove the iPhone Nand flash, and then remove the iPhone baseband CPU.

Next we're going to remove the iPhone main CPU. Put iPhone motherboard under a microscope, and then use BGA scraper blade and hot air gun to remove the glue for A12 CPU, and then use medical cotton to clean it. Now use hot air gun to heat the main CPU, after a while, carefully insert a blade, and slide the blade gently to both sides, and then remove the main CPU.

Next we need to remove the logic eeprom IC, as we know, since the iPhone X and later models, the logic eeprom IC is multi-pin, if the logic eeprom IC doesn't been installed, then it will report unknown error 9. Use hot air gun and BGA scraper to remove the logic eeprom IC.

Because the baseband eeprom IC is too small, so we can remove it later. Now we need to install those IC that has been removed previously to the new motherboard.

First install the iPhone Nand flash. Check iPhone Nand flash solder pins, there are 3 solder pins that are grounded, so we can leave them. Remove the glue from the Nand flash, place it to the MJ 3D BGA reballing stencil, apply some solder paste, and then soldering the tin balls on the Nand flash.

After reballing, we need to unbind the WIFI. Use JC PCIE-XR programmer to unbind the WIFI, and then we can install it to the new iPhone motherboard. Apply some solder paste to the solder pad, use DES H95 rework station to install the iPhone XR nand flash to the new motherboard.

Now we need to reballing iPhone basebande CPU and iPhone logic eeprom IC. After reballing, we need to handle the iPhone main CPU. Use hot air gun to solder the tin, clean it, and then reball it.

Install the A12 CPU on the new motherboard. Put main CPU on the right position by tweezers, and then use hot air gun to heat it. When the solder oil overflows, gently push the CPU with a Titanium Alloy Tweezers to see if it is reset, if it can reset, then we can stop heating.

Next install the iPhone logic eeprom IC and iPhone baseband CPU on the new motherboard.

Now we need to remove the iPhone baseband eeprom IC from the old motherboard, and then install it to the new motherboard.

At last, test the iPhone XR 4G network, it's working perfectly.

Here get hardware solution to fix iPhone XS Boot Failure

The iPhone XS can't be turned on after pressing the power button, after testing, we confimed it's caused by hardware problem, now let's get hardware solution to fix the iPhone XS boot failure.

Disassemble the iPhone XS by phone opening tools, connect the iPhone XS to the DC power supply to test the boot current, when press the iPhone power button, the current instantly reaches more than 800mA, and then drops to 0mA immediately.

Remove the iPhone display screen, disconnect the iPhone battery, and then remove the iPhone motherboard.

Use digital multimeter to measure the circuit of the power supply, we found the PP1V1_S2 is short circuited.


Log in to ZXW online account to check iPhone schematic diagram,  we need to measure the capacitors on the PP1V1_S2 circuit. After measurement, we know that those capacitors are normal. Therefore, we suspect the problem is between the iPhone CPU and the iPhone motherboard, the iPhone CPU tin balls may have broken, and then cause the PP1V1_S2 short circuit.

Attach the iPhone XS motherboard upper layer to the SS-601K PCB fixture, apply some solder paste around the iPhone CPU, and then use BGA removal blade and hot air gun to remove the iPhone CPU.

After the iPhone CPU is removed, put iPhone motherboard under the Trinocular microscope, and then use BGA removal blade to remove the glue on the iPhone motherboard.

Next, put MJ 3D BGA reballing stencil on the iPhone CPU; apply some Mechanic solder paste to the BGA reballing stencil, and then use hot air gun to reball it.

After reballing, apply some solder paste on the iPhone motherboard, and then put iPhone CPU on the right position, use DES H95 hot air gun to solder it back the iPhone motherboard.

Now install the iPhone XS, press the power button, the Apple logo appears normally, and then the iPhone XS enters IOS system successfully ,the iPhone XS boot failure has been solved!

iPhone 6 flashlight failure with hardware solution

Here is an iPhone 6 with flashlight failure, after measurement, we confirmed it's the hardware problem, here is a hardware solution to fix the iPhone flashlight problem.

First of all, we need to disassemble the iPhone 6. Use screwdrivers to remove the screws next the iPhone lighting port, put iPhone 6 on the CPB screen separator for heating, turn the iPhone display screen down and connect it to the CPB screen separator. After a while, we can take out the iPhone 6, and then use LCD sucker to open the iPhone screen easily.

Carefully remove the iPhone display screen, disconnect the iPhone battery, and then remove the iPhone motherboard.

Put iPhone motherboard under the microscope to observe, it’s found that there is no iPhone flashlight IC, and the solder pad of the iPhone flashlight IC has lost several pins.

We contacted the owner of the iPhone 6 for more details, and the owner of the iPhone said that this iPhone 6 was repaired by other shop, and they replaced the iPhone flashlight IC, but it didn’t work because the iPhone flashlight IC was burned after a while. So they removed the iPhone flashlight IC and didn’t install it on the motherboard.

There are 8 Pins were lost by counting the missing pins under a microscope. Log in to the ZXW online account and check the iPhone 6 schematic and bitmap, and we can see that for those missed Pins are grounding line, the power supply of the LEDI light, the Pin of the flashlight auto boost Pin.

The iPhone flashlight IC was burned because the iPhone flashlight IC lifted boost Pin lost, the signal is in a suspended state, causing the iPhone flashlight IC to burn after power-on.

Attach the iPhone motherboard to the PCB holder fixture, put it under a microscope, apply some solder paste to the motherboard, and then use QUICK TS1200A hot air gun to solder the missed pins on the solder pad, and then use green UV oil to insulate and cure it.

Now, install an iPhone flashlight IC to the motherboard, and then assemble the iPhone 6.

Press the power button to turn it on, get into IOS, test the flashlight function on the iPhone 6, now iPhone 6 flahslight function works perfecly.