Way for Deal iPhone 5S Camera Fault

Though iPhone 7 has become more and more popular, there still exist someone who prefers iPhone 5S. 

The next repaired iPhone 5S looks clean and beautiful, maybe its master treat it gently, but there seems happens some faults on its camera.

We have fixed many camera faults, most of them were caused by the corrosion and pseudo welding of the base. Anyway, let us check it.

According to our experience, we need to confirm the fault through the current and voltage. The following picture 1 is the basic structure of the rear camera circuit. Let's take a look at the iPhone 5S power supply part shown in the WUXINJI circuit diagram.

For the L29, L30, L28, FL43 components, it is easy to cause no power supply after water corrosion, the problem can be solved by short connection, U210 and U13, the two small glass IC also easily damaged cause no voltage output, it can be short connected as picture 2.

Be careful not to use hot air gun to remove the U210 and U13, because the Baseband chip is next to them! If you remove it with a hot air gun, the baseband chip will short.

First remove the black glue from the IC and heat with the HAKKO soldering iron.

Let's take a look at the circuit diagram of the front camera interface J1, as shown in picture3.

The voltage of 2.85V is sent to the interface through FL44, 1.8V passes through FL23 to the interface J1, FL44 and FL23 are easily corroded and damaged, resulting in camera function failure. Interface J1 water is easy to corrode too, patiently clean it and add solder paste or replace J1.

  

The video signal sent by main CPU is sent through FL13, FL15, FL12, FL14 to J1, inductor FL13, FL15, FL12, FL14 are easy to get corrosion and cause camera problems, short connection will solve the problem.

Fine, after you finish all the steps, open the camera APP, check it whether it back to normal.

How to fix iPhone 5S boot failure

While iPhone has updated to 10,  more and more people prefers to choosing iPhone 6 or 7. But there still exist some people would rather choose iPhone 5S, cuz its beautiful size,  if it happens some faults, we still need to repair it.

1. Large current and won't boot

This situation is caused by short circuit in PP_BATT_VCC, PP_VCC_MAIN, the solution can reference to power leakage repair.

2. No leakage without turning on, large current when press the power button

This is the case that the output of the power IC circuit is short circuited, you can measure the resistance of the output to the ground with Fluke digital multimeter one by one to find the short circuit parts, then find the specific short circuit parts with the method of detecting the leakage.

3. Turn on with 50 Ma Current

This situation is mostly iPhone CPU or NAND pseudo welding or damage, which is very difficult to repair! Because the NAND chip can not be replaced alone, the cost of replacing CPU is also very expensive. And you can't make sure it will be 100% successful, so it is better to give up in this case.

4. White Apple stuck on screen, blue screen, line crash in English, red screen or color changed after restart.

For white apple stuck on screen problem, first make clear whether it is not to turn on or just display is not normal, you can turn on the iPhone to connect Ace assistant, if it can turn on normally, then it can be online and Ace assistant can read the information of the mobile phone, then it means the problem is from the display part, the solution is to reinstall or replace touch IC.

5.U2 damage will cause reboot failure, white apple stuck on screen, iPhone start at 200MA.

6. If iPhone is in the recovery mode, first flash to see what the error, if it is error 4013, you can replace a iPhone compass IC or U2, if it still doesn't work, generally it is the NAND damage, replace the NAND flash chip, if it is error 9 or 14, the U6 or NAND get damaged, first replace U6, if not working, then you can replace Nand chip.

7. if the restart current is about 50 Ma, computer will automatically enter the DFU mode, which is mostly caused by CPU abnormal work, check whether some of the resistance of the peripheral CPU are pseudo welding or falling off.

If you want to DIY it, maybe the above-mentioned fixing way will be useful for you.

Detail Way for Repair iPhone 7P Boot Failure

According to our ever experience, the fault related with boot failure, usually it was caused by the control IC. 

Anyway, we need to test the current and voltage, then get the final result.

First step we need to connect it to DC power supply with iPhone lightning cable to test the iPhone charging current, the current jumps around 200 mA, not stable. The computer can't identify the iPhone when it is connected, and it doesn't boot.

Nest we need to disassemble iPhone to detect. Use phone opening tools to tear down the iPhone, and then remove the iPhone motherboard. Measure the iPhone motherboard with Fluke 15B+ Digital Multimeter, there is no current, which means no leakage. Trigger it and it shows large current, the current up to 1.9A. Now, apply some rosin on iPhone logic board, and then use QUICK 861DW hot air rework station to heat it, it's turning white.

Picture 17-8-1

It's frustrating to see this, did the iPhone main power break down? Open the WUXINJI Dongle to check iPhone bitmap, we found the iPhone Nand flash power also was in the hot spot, first we need to measure the iPhone Nand flash to check if it is short circuit. After measurement, the iPhone Nand flash is short circuit.

 

Picture 17-8-2 

Now, scrape out the iPhone Nand flash around the tape of the power supply large capacitor, and then apply rosin on it, adjust the ammeter to 3 V and heating this circuit by QUICK 861DW hot air rework station, this capacitor is short circuit, remove it.

17-8-3

After finishing the last step, we test it again, get the normal current and voltage value, boot it,  the phone back to normal.

Check iPhone 6S Plus No Service Fault Carefully

While the no service fault always along with the SIM card, at the same time, SIM card along with the signal part and REFF bus, so we need to find the sources fault. 

Obviously, we need to check it carefully, cuz it ask a disassemble. Following the steps:

Plug SIM card in, we can see the serial number when dial *#06# on dialing interface, as shown in 17-7-1, it seems that it is not the problem of the REFF bus, so we can exclude the fault caused by the bus (if the bus caused the fault, it will not show the serial number on the iPhone 6s Plus screen after dialing the *#06#).

Picture 17-7-1

From picture 17-7-2, we can see the operator option on the interface, there seems to be no problem with the receiving section. The problem is in the launch section.

Remove the iPhone 6s Plus logic board and measure by Fluke digital multimeter, we found the resistance value of PP_1V0_LDO9 was only 47, which was supplied to U_WTR_RF RF IC.

Remove the U_WTR_RF RF IC to measure again, the ground resistance value returns to normal.

Replace a new iPhone 6s Plus RF IC, install to have a test.

Conclusion: the fault was caused by U_WTR_RF RF IC.

We just need to remove it, we will note it, how about you?

Error Code 14 On iPhone 6S Plus iTunes

Usually the error code will match with the corresponding deal way.  

As for the error 14, we doubt there happens some fault on Phone NAND flash. What we got the iPhone 6S Plus reports the fault error 14, so we need to handle it carefully.

Anyway, we still need to flash it , connect iPhone to computer with lightning cable, use iTunes to flash iPhone, the iTunes reports that the iPhone "iPhone" could not be restored. An unknown error occurred (14).

Disassemble the iPhone, take out the iPhone motherboard, and then carefully remove the iPhone Nand flash. Check iPhone bitmap on WUXINJI Dongle, and then measure the diode data with multimeter, we found that the resistance value of iPhone Nand flash solder pad M6 Pin is infinitely large.

Picture 1

This pin passes through the R1501 resistor and pulls down, there is no resistance value when measured it with Fluke 15B+ Digital Multimeter, now we're judging that the R1501 resistor is damaged.

Use QUICK 861DW hot air rework station and tweezers to replace the R1501 resistor, and then measure the resistance value of iPhone Nand flash solder pad M6 Pin again, the data is normal.

Picture 2

Install the iPhone Nand flash to iPhone motherboard, now the flash is finished successfully. The iPhone 6S Plus fault has been repaired.

How to check iPhone 6 boot fault?

Don't be panic when your iPhone 6 can't boot, most of this case was caused by  control IC. But as the fault was caused because of the secondary fault, so we need to pay more attention on this guy.

First of all, check the bus and reset, both of them are normal. Cut the shiled cover above the fingerprint, use Fluke 15B+ digital multimeter to measure the resistance of CPU to the clock and data.

The normal values of R0317 and R0316 are more than 400, the measurement of R0317 resistance is 745, and the R0316 is 479. This case is mostly the two pin of AP31 and AR31 in the right lower right corner of CPU has pseudo soldering. First press the iPhone 6 CPU to test whether the device can turn on or not, do not try to reflash the phone first, it will report error 9. Of course, the best method for CPU pseudo soldering is redo the parts, here we try a method of jumper wire connection without removing CPU necessary (6 and 6P can be common used).

As shown in picture 17-1-1, look at the position of the two points on the wuxinji schematic diagram, the lower right corner is 0, the width is 1.45MM (the width of 4 solder joints), the height is 1.75MM (the height of the 7 solder joints), which can be slightly shaved on this basis, first probably draw a rectangle. When the upper cover is very hard, do not use brute force, select a sharp phone repair blade, you should slow down when finish scraping on the white pad from cover to the CPU upper cover, after scraping the white pad, the point we are looking for will come out, the wire on the CPU chip must be operated under the HDMI Camera microscope.

picture 17-1-1

First test the resistance of the two points. If normal, smear green oil on the top (except for the two points we are going to connect jumper wire). After the curing we can connect jumper wire, use QUICK TR1300A hot air gun to blow very small tin balls on the 2 points respectively , we choose to use the wire of the receiver, it's thinner, the receiver wire is with glue, scrape the 2 ends and apply a little solder. As shown in picture 17-1-2.

Picture 17-1-2

Use jumper wire on the corresponding two points separately. ( it's better to do on both two points to avoid rework repair). Once you finish flying, just apply the green oil and use UV light for curing.

Like we predicted, the fault happens on IC, if you can finish the soldering rework by yourself,  you may can try to the continued steps.

DIY Solution for iPhone 7 Charging Error

Fault Description: iPhone 7 happens charging fault while control IC was replaced ever.

According to the attached file, we doubt there may happen fault on the phone control IC, so we need to disassemble it, get the PCB board ,with the diagnostic tool to check it.

The iPhone 7 USB control IC damage will cause charging and online failure, prompting unrecognized USB and no support for this accessory, it may also cause a failure to stuck on white Apple logo while turning on the iPhone.

How do we repair the charging fault? it can be solved by the short connection, we can check the iPhone 7 charging part schematic diagram by WUXINJI dongle as shown in picture 1-1, the detailed repair steps are as following:

picture 1-1

1.Plug in data cable and use Fluke 15B+ Digital Multimeter to measure whether the PP5V0_USB of point A has a 5V.

If not, check and replace the iPhone 7 charging port flex cable.

If there is 5V, continue to see if there is 5V at the point B.

2. As shown in picure 1-2, continue to measure the 5V voltage with multimeter.

picture 1-2

If not, it indicates that the charging protection tube is damaged, which can be short connected as shown in the picture.

3. If both point A and point B have 5V, replace the charger IC and USB control IC.

If you are interested in DIY, maybe you can check it by yourself, with a microscope along with the LED light, then you can try to fix it by yourself.