Solved: iPhone 7 Plus unable to enter IOS and report error 9

 Here is an iPhone 7 Plus accidentally dropped into water, it still can be used normally when we clean up the water, however, it can't be used after a day. The problem is that after press the iPhone power button, it always auto restarts. When we re-flash it with iTunes, it reports unknown error 9. We have to solve it. 

According to our experience,  the iPhone Nand flash and iPhone logic epprom IC all can cause this problem. Now, we need to disassemble the iPhone 7 Plus first.

Use phone opening tools to disassemble the iPhone 7P, take out the iPhone motherboard. Use digital multimeter to measure the power supplu of the iPhone Nand flash, the  3V, 1.8V and 0.9V all are noraml.  

Check iPhone motherboard under the Stereo Zoom Microscope, we know that the iPhone Nand flash and iPhone logic epprom IC didn't been repaired, but the iPhone baseband part did. Leave it alone, now we try to fix it by replacing iPhone Nand flash, after replacement, it still reports unknown error 9, then it may problem of the iPhone logic epprom IC. Directly replace the iPhone logic epprom IC, after replacement, it still reports unknown error 9.

As we know, when the resistance value of the two resistors that connected to the logic epprom IC is too large, it will also reports error 9, try to replace these 2 resistors. Remove the iPhone logic epprom IC and the resistors that connected to it, and then with the help of the QUICK 861DW hot air rework station and Titanium Alloy Tweezers, we replace all of them.

After replacement, re-flash the iPhone, now the process bar is running normally, which means the iPhone baseband part is no problem, the iPhone is basically repaired. 

After the flash done, press the iPhone power button, now the iPhone 7 Plus can be turned on smoothly, and it is entering the IOS system successfully, all functions on iPhone 7 Plus tested are normal.

Solved: Error -1 and always keep DFU mode on iPhone 6S

The iPhone 6S has -1 error and always keep DFU mode,  we can't get into IOS system smoothly. In a word, the iPhone 6S can't used at all, how to solve it? 

First Step

Disassemble the iPhone 6S by phone opening tools, and then connect iPhone motherboard with DC power supply, the current is 100mA. 

Second Step

Test the power supply of iPhone Nand flash by DC power supply , the iPhone Nand flash on the left side of the capacitor can be tested to 0.9V, 1.8V, 3.0V, the power supply is normal

Third Step

Removeing the iPhone Nand flash to test. First, hit the resistance value, and it is normal. Test the iPhone nand flash by using the iPhone test fixture. This 6S original Nand flash is damaged, the data can only be read but only replaced.

Fourth Step

Query the serial number through IMEI. The professional of sn with BT WF address can find out the Bluetooth and WiFi address (referred to as the three codes). After the mobile phone is replaced, the mobile phone after win 11 must be written to the original three codes to activate after replacing the nand flash.

Before writing the code, write the underlying data of the corresponding model first. If the underlying data has any problems, there will be some strange problems, which belongs to the underlying error phenomenon. So you can use JC PCIE  NAND test fixture to read and write. After watching the camera, the screen is reversed. Re-writing the underlying data to solve the problems

Final Step






After re-writing the data, install the iPhone 6S and test it. Flash the iPhone, it flash process bar goes successfully, there is no unknown error appears. Turn on the iPhone, the iPhone is entering the IOS system smoothly. The problem has been solved!

Repair Ideas for iPhone 5 charging failure

 The iPhone 5 has charge failures, such as not charging, the iPhone battery power getting less when it in charging, the iPhone auto restart and so on. For some iPhone charge failures, it's easy to fix, some it's a litter complicated. In this page, we have some repair ideas for iPhone 5 charging failure.

Before we are going to fix it, we need to know the iPhone charge schematic diagram,  we can check on WUXINJI Dongle.  

The charging part of iPhone 5 is made up of Q2, U2 and U7, so, the  Q2, U2 and U7 are the key to the iPhone's ability to recharge smoothly. 

The 5V voltage sent from the iPhone tail plug flex cable passes through the Q2 to send two 5V power supply. PP5V0_USB_PROTECT and PP5V0_USB_RPROT were sent to U7 and U2 respectively. There are two detection pin in the middle of the battery contact J6! they pass through FL10, FL11 respectively and send to power IC-U7, FL10, FL11. 

Now we are going to share some repair ideas. 

First, we can try to replace the new iPhone batter. Becasue the iPhone 5 is old model, if the iPhone battery is broken, then we can't charge it in normal mode.  

After iPhone battery replacement, if the iPhone 5 still is not charging well, we need to check iPhone motherboard.  

Disassemble th iPhone, connect iPhone motherboard to the DC power supply,  use DC power supply to measure whether C304 has 5V output, and measure whether C272 has 5V output.

If there are no 5V, you need to check the iPhone 5 charging port flex cable, and then use jumper wire to short connect the Q2.

If both of them doesn't has 5V,  then the problem is in U2 or U7.We can remove the U2 and U7 from the motherboard, , adn then install the new one.

Hardware fix iPhone 6S no display after booting

We received an iPhone 6S to repair, the problem is that the iPhone 6S LCD screen has no display after booting. This iPhone 6S has been repaired once because of other problems, we need to repair it. 

Use phone opening tools to disassemble the iPhone 6S, and then use DPS DC power supply to boot iPhone, the iPhone can be turned on smoothly.

Install the iPhone battery, assemble the iPhone, press the iPhone power button to turn on iPhone through by iPhone battery, the iPhone is turned on, but the iPhone LCD screen doesn't display.

Considering the voltage of iPhone batter is 3.6V to 4.3V, so we adjust the DPS DC power supply to the lowest value 3.6V, the result tested is that the iPhone doesn't display after booting.

According to our repair experience, in this case, the iPhone no display problem is caused by the low display boost.

Check iPhone schematic diagram through by WUXINJI Dongle, based on iPhone 6S schematic diagram, we know that the iPhone display boost capacitor are C4007 and C4008.

With the help of the QUICK 861DW hot air rework station and tweezers, we remove these 2 pieces capacitors smoothly, and then install the new capacitors.

Assemble the iPhone 6S and test it, now the iPhone 6S displays normally after booting. 

Latest Solution: iPhone 6P recording function unavailable

 The iPhone 6 Plus recording function is unavailable,  but the other voice function is normal, the music rigntong is normal.  Here is the latest solution for it. 

Use phone opening tools to disassemble the iPhone 6 Plus, remove the iPhone motherboard, put iPhone motherboard under the microscope to check , we find the R0301 resistor that next to the iPhone big audio IC is missing, replace the new iPhone big audio IC, and solder the R0301 resistor.

The R0301 resistor is missing, and this resistor is on the I2SO but clock signal between the iPhone audio and CPU, so we think we can fix it by soldering the resistor and replacing the iPhone big audio IC.

Turn on the iPhone 6 Plus, open the voice memos to test the recording function, but it's still not working.

Analysis and observe it, we find that there is the trace of the welding on the shield cover of the iPhone baseband, which means the colleague has repaired the iPhone baseband signal part.

Use BGA remove graver to pry the glue of the small components that next to the iPhone tail plug cable, we pry it slightly, but many small components fell off, which means the temperature and air are not controlled well when blowing the shield cover or fixing the baseband signal part via QUICK 861DW hot air rework station, there are virtual welding phenomenon on those small components. Check the iPhone bitmap through the WUXINJI Dongle to find out the signal. There is a MIC insurance inductor, short connect it, re-weld  components.

Install the iPhone 6P, press the iPhone power button and test it, now the recording function is normal, other functions tested are normal.