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!

Excellent solution for iPhone 6S home button not working

Customer sent an iPhone 6S to us, the fault phenomenon is that the iPhone home button is not sensitive and fail frequently. Get into IOS system to test it, the fingerprint function is normal. Sometimes the iPhone home button needs to be pressed several times before it can respond; we suspect there's a problem with the shrapnel button behind the fingerprint key.

Disassemble the iPhone by phone opening tools, then replace the fingerprint button and test it, now the home button function back to normal, so we exclude the iPhone motherboard error. Remove the waterproof adhesive covered by the shrapnel button, which is behind the fingerprint button. Put the multimeter on the corresponding pins, press the switch and test it, the data is normal, so we can eliminate the problem of the switch itself.

Put it under the phone repari microscope and observe it carefully, we found a rift in the edge of the line, pry the iron sheet off the power button, scrape the line, we can make sure it is disconnected. Solder the jump wire with phone rework station, this fault is resolved.

Before we pry the iron sheet, we need to clean up the solder tin in the red circle first by suction tin wire. If you don't clean it up, and directly pry it, it's easy to break the line again. Scrape the line with a sharp blade and gently scrape it, because the line is very thin, the blunt blade is easy to scrape off the line.

After the scrape, solder the tin on the pins. Find a thin copper wire and apply the tin, and then align them, heating the copper wire, finally you can fix it.

After soldering the jump wire, paint some green UV oil on it, fixed it with a UV lamp light, and then install the iron sheet in the same place. Welding the solder tin on the corner to fix it, and apply green UV oil to the edge position to fix the iron sheet. 

iPhone 6s no display? The best solution is here!

The iPhone 6s accidentally drop into ground, we pick it up and turn it on, the iPhone screen shows black, it just no display. However, it can receive the phone call. We need best solution for this issue!

Disassemble the iPhone; take out the iPhone battery and supply power to it with DC power supply, the current is normal. Remove the iPhone screen, and then install the test screen, power on it and test it, the screen can display normally and appear white Apple interface. We thought the screen was damaged by dropping, but when we plug the original screen, it also can be light up, so we can exclude screen problem. 

The device light up, there are some problems when we are waiting to enter the IOS interface, blurry screen, grey screen, black screen, and it then cannot be wake up. Unplug the power and reboot iPhone, but the problems still exists.

Determine the fault is in the display section, remove the iPhone motherboard, use multimeter to measure the diode date of display socket, the data of all signal and power supply is normal. Reinsert screen and boot it, the white Apple still can be display, but after about 10 seconds, the screen suddenly turn into dark.

Unplug the power plug and screen test socket, measure the diode data on it, we found that the diode data of two pins on backlight is abnormal, one is more than 300, one is more than 700, the normal data of both pins should be around 600, as shown in picture 9-11-2. After a while, the data is normal, the data of these two pins also is normal in the first time, so we judged the faulty probably in the backlight part, so we replace the backlight IC. We can check it under the microscope.

After replace the iPhonebacklight IC, the boot process without any abnormalities, it can directly into the IOS. 

Finally, we input the boot password and test all functions, everything is fine. The iPhone 6s has been repaired!

SOLVED: No response when the iPhone 6S is powered on

 The iPhone 6S accidentally fell to the ground, and then it has no reponse when boot it.  Online state is not normal, drive also displays incorrectly, as shown in picture 1, this phenomenon is usually caused by virtual soler on CPU. This device was fell over by customer, so we can judge that the reason must be the virtual solder. 

After soldering CPU with solder station, the iPhone 6s can be normal online, but it displays error 4013 when flashing system.

The error 4013 is reported when the progress bar just appears on screen, as shown in picture 1.

For iPhone 6S device, if this phenomenon happens, which are generally baseband problems, so we remove the baseband, indeed some tin points come off. 

Make jump wire on the disconnected but useful pin, install chip on it, but it still shows error 4013 when flashing, seems there is still a problem exist. Rooting the device repeatedly, we find when white apple appears, baseband S3, S4, S5 voltage can be instantly measured with power supply besides S2, but we still can measure the ground value on S2, is it the baseband power failure? Remove the baseband power supply chip, by the way of measuring its pin, it is found that the 91 and 97 pin of the baseband power supply IC are blocked. so we can see the problem has been found here. Remove the inductance, its pin has been damagd. The front is good while the reverse falls a pin. 

So we replace the damaged parts and install original fingerprint, the progress bar is normal when flashing now. The repairs ended here!