Professional Cell Phone Repair Guide

The customer sent a iPhone 6P motherboard with white WiFi fault. After getting the board, we first have to test the fault. 1. Install the iPhone board to measure all the functions, we have determined that the fault is on WiFi, all the other functions are all normal. The clock is also working properly. 2. Based on our previous cell phone maintenance experience, we confirm that the only problem of the iPhone 6P is WiFi failure. 3. Take the motherboard to observe under the LED stereo microscope , we found that WiFi had no cracks and no pressure. 4. Prying down WiFi we found no breakage or dropping point. 5. Replace the iPhone 6P WiFi module . 6. After replacing the WiFi module, we found that the WiFi signal is weak. 7. Connect the Wifi, 2G, 4G with jumper wire on the iPhone 6P board , as shown in the picture. Get more professional phone repair guide on www.vipfixphone.com

A customer sent a iPhone 6 that needs to be repaired. This iPhone 6 has a white apple malfunction. The fault described by the customer is iPhone motherboard deformation, water damage, layer breakdown, fingerprint failure. After receiving the iPhone motherboard, measure the iPhone motherboard. Connect iPhone motherboard to the DC power supply , the boot current is large, the failure is iPhone 6 white Apple and large boot current. We need to detect the iPhone motherboard carefully, （ put it under the microscope to observe, no specific faults found ） Based on our previously repair experience, when measure the resistance value of the USB by digital multimeter , the resistance value turns down. Use Titanium AlloyTweezers   to remove the USB IC, the boot current measured is normal, so we replace the USB IC directly. After replacing the USB IC, assemble the iPhone 6 and test, all functions are fine. More cell phone repair information get from www.vipfixp...

We are going to fix an iPhone 6 today, the problem is that the receiver of the iPhone 6 has no sound. When the phone receive calls, we couldn't hear anything from the receiver. It just keep silence. How do we repair it step by step. 1. Test the iPhone 6. Use another cell phone to call this iPhone, the ringtone is normal, but when we answer this phone call, there is no sound. 2. Disassemble the iPhone 6. Use phone opening tool to disassemble the iPhone 6, take out the iPhonemotherboard . 3. Observe the iPhone motherboard. Observe this iPhone 6 closely with our eyes, the iPhone motherboard has been repaired, the motherboard has traces of water. 4. Remove the iPhone big audio IC. Put iPhone motherboard under the Stereo Zoom Microscope , and then use tweezers to remove the iPhone big audio IC. After remove the iPhone big audio IC, we found the bottom pin was corroded.  5. Clean the corroded place. Use the BGA remove graver to clean the corroded part. 6. So...

We are going to repair an iPhone 6s today, the main failure is that the iPhone 6S rear camera  can not be used. After getting the device, we first install and test to confirm the failure. How to fix it step by step? Let's check in the article:   1. First of all, use iPhone 6S opening tools to disassemble the phone and remove the motherboard to observe carefully. 2. After we remove the motherboard, we found that the board is good, and the real camera socket is also pretty. 3. Next we have to check the motherboard and test the resistance of the socket with a Fluke digital multimeter . We found that the 13 pin of the socket have no resistance. 4. The 13 pin is communicant to the FL3110 beside WiFi chip, the inductance is off, so we need to short connect by jumper wire . 5. install the iPhone 6s to test again, iPhone 6S rear camera can be used normally, the fault is fixed successfully. More professional phone failure solutions check on www.vipfixphone.com

Received an iPhone 6S motherboard from one of our customers, the main problem is that the iPhone 6S is short circuit after restarting. How to diagnose and test the problem step by step, let's check in the article. After receiving the iPhone 6S motherboard, we observe first and found the board is very good, it's never repaired before. Connect iPhone motherboard to the DPS DC power supply , the current of the beginning tested is 20mA, it's normal. When the current jumps to 40mA, which means the iPhone power and CPU starts to work. When the current jumps to 10.6mA, which mean the upper was opened. When the current jumps to 70.8mA, which means the iPhone Nand flash  starts to work. When the current jumps to 100mA, which means the CPU starts the I2C data bus, at this time, the iPhone display power IC start working, the Apple LOGO will appear on the iPhone display screen, and then the iPhone backlight start to work. At this time, the current is usually around...

We received a iPhone 6S with ringtone function fault, how to test and repair step by step? Let's check in the article!   Failure analysis: first of all, we install the iPhone 6S motherboard to test whether there is any vibration without bell, because ringing and vibration are closely related.  It is found that the vibrating bell is not entirely absent, there a little sound just click it, then the sound disappeared at soon.   For this kind of situation, we can give priority to check the iPhone 6S bell boost in this respect, observe under the LED Stereo microscope , we found the L3700 bell boost a little blackened.  The picture are shown as as follows: Solution: Replace a new L3700 coil, install the iPhone to test again, the ringtone fault is perfect solved now! (general coil without direction and model difference, can be commonly used) If you want to get more cell phone repair solutions, contact us on www.vipfixphone.com

We are going to fix an iPhone 6 Plus, the fault is that it has no baseband, there is no Modern Firmware on the iPhone Settings. how to repair the fault? Let's check in the article. First of all, use phone opening tools to disassemble the iPhone, take out the iPhone motherboard, which looks good. Put it under the microscope, carefully open the CPU shield by Titanium Alloy Tweezers , and then use digital multimeter  to measure the resistance value of the bottom pins of the baseband power, the data tested is normal. Remove the old iPhone baseband power, and then install the new iPhone baseband power, after replacement, test the iPhone, still no baseband. Now, remove the shield of the iPhone baseband CPU . Under microscope, there are traces of corrosion in the iPhone amplifier power supply IC. Use QUICK 861DW  hot air rework station to heat iPhone amplifier power supply IC, and then take off the iPhone amplifier power supply IC. Install the iPhone, an...

Received a iPhone 6P motherboard from one of our customers, the problem is in display touch part. Let's check how to repair it. Test: After install the motherboard to test, we found it's blurred screen, like a snowflake flash, and then black screen, reboot and test again but completely did not show anything on screen. Fault analysis: But from the fault mark inference should be able to cross the interface but not touch, however, it can not display now, we judge that the problem in the display part of the probability is greater. The display base is nice and the ground resistance is measured normal with Fluke digital multimeter . After careful observation, it is found that the shield cover of the main CPU has a little pressure and cracks at the solder joint. Repair: Remove the shield, the fault point is more intuitive under Stereo Zoom Microscope , there is a pin of the display IC U1501 is crushed. Replace a good iPhone 6P display IC and install to test, p...

We are going to repair an iPhone 6S motherboard, the customer mentioned that the the problem is that there was a noise when the iPhone was recording, the quality of the recording sound is bad. This iPhone motherboard  was repaired once, now we are going to repair it. Customers say there's a noise when the iPhone is recorded. First, we need to install an iPhone motherboard to check if there's a problem with the external configuration of the iPhone. After testing, the failure of iPhone is exactly what the customer described. According to our maintenance experience, this is usually caused by the J4600 plug in the rear of the iPhone or the U3500 audio on the iPhone. Usually, when faced with this problem, we can take the sponge out of the rear plug socket J4600 of the iPhone and look at the capacitance resistance inductance below. We can observe it under the Trinocular Integrated Microscope . After removing the sponge, we found the FL4601 and FL4611 resistor f...

We are going to repair a iPad mini 2 today, the main problem is that the display and backlight not working now. How to repair the problem with the best solution, let's check in the article. Open the iPad Mini 2 to observe, we can see that the lower half of the motherboard is water damaged. Check the motherboard under the magnifying glass  carefully. The power supply and the display interface are corroded badly. First we deal with the power part, and then carefully deal with the display interface, because this iPad is the display and backlight problem, when finished processing, one of the resistors fell down, check the schematic diagram on WUXINJI dongle , we found it's the light IO data interface, this resistance is 1 ohm.   The ground resistance value was measured by Fluke digital multimeter  at the display interface after the short connection with jumper wire. It was found that there were four places where the resistance value of the pin have no resistance value....

We are going to repair a iPhone 6s with charging failure, it's a common problem for cell phone repair technicians, how to repair the problem step by step? Let's check in this article. The iPhone 6S motherboard has a slight water problem, resulting in the iPhone 6S can not start, after repair, the iPhone 6S can be turned on normally. However, after testing, the iPhone 6S won't charge, and when plugged into the charger there is no response, no sign of charging, the iPhone can connect to the computer. Use Stereo Zoom Microscope  to observe the iPhone charge circuit, there are no visible signs of water damage on iPhone tail plugs. Considering that there is water damage on the motherboard of the iPhone and that the iPhone can be connected to a computer, it is important to study the water damage circuit on the motherboard of the iPhone based on previous repair experience. After careful examination, we found that the resistor R45 10 was corroded by water. A...

Customer sent a water damaged iPhone 6S to us for repair, the fault is the phone not turning on, after observation, we found that the power supply IC part is corroded. After cleaning the corroded part, it still won't turn on. The leakage is 6 Ma and the starting current is 50 ma by measuring with DC powersupply . Due to the fact that IC is more likely to cause this failure, we are going to remove it to retest, the problem is solved now. Then replace the display IC and install to test function. All functions are normal, but it can not charge and also can not connect to the computer now, after replacing U2 u2300, fault still exists, then remove the shield cover, measuring its IC side circuit, we found that the end of the capacitor c2300 corrosion blackened. After checking the drawings on WUXINJI dongle , the capacitor can not be removed because it is not a ground protection capacitor, but a coupling capacitor on the TIGRIS-BOOT circuit. Finally, di...

A customer sent us an iPhone 6S to fix, and the problem with the iPhone 6S was that it didn't start. After we received the iPhone 6S, we tested it. IPhone 6S looks good, iPhone iPhone does not respond to the same button as the power button. It does not respond when charging iPhone 6S. Disassemble the iPhone 6S, connect iPhone motherboard to the DPS DC power supply , the boot current stuck in 50mA, which is abnormal. Take out the iPhone motherboard, check the appearance of iPhone motherboard, there is no water damage or drop damaged phenomenon.   Put it under the Trinocular Stereo Microscope , and observe carefully, we found there is a bruise next to the iPhone Nand flash  that hit by screws. Scrape the circuits on the bottom by BGA graver blade , and then apply some green UV oil  to it, blow it by QUICK 861DW  hot air rework station. Finally, assemble the iPhone 6S and test it, the iPhone 6S can be turned on properly, the problem has been solve...

There is an iPhone 6S with a high current and gray fingerprint fault , we are going to fix today. Before repairing, we have to test it first. How to repair step by step, let's check in the article! 1. Test whether the fault is the same as what the customer said. 2. Observe under the Trinocular Stereo Microscope to check whether it has been repaired before, whether it has compression deformation, water corrosion, the most important is whether the customer's description is right. Test result: boot current 150 mA, grey fingerprint. - Look at the most obvious grey fingerprint according to the data. (1) Use Fluke digital multimeter to test the resistance, voltage, we found it has short circuit phenomenon. (2) since we found the problems, so we should eliminate them one by one. - Test full function (1) test full function (2) set up the fingerprint (3) clean the motherboard (4) do the marks that we have dealt with. All the problems are successfully sol...

Received an iPhone 6S, it was not displayed after turning on. The iPhone 6S accidentally fell into the water, but the owner quickly took it out and it didn't seem to have been much damaged, but the iPhone 6S could still be turned on. How to repair the problem? Let's check in the article! After receiving iPhone 6S, we need to test it first. Press the power button on the iPhone and the screen stays black. We try to call it using another iPhone. It works. The iPhone 6S responds, but the iPhone LCD screen is still not displayed. Open the iPhone and connect it to the DC power supply  to test the iPhone boot current, the current data tested is normal, which means the iPhone can be turned on smoothly. Now, we confirm the failure is that the iPhone doesn’t display. Take out the iPhone motherboard, observe it under the Stereo Zoom Microscope , there are small trace of water on the iPhone motherboard. Carefully clean it up, and then continue to observe. Observing ...

Based on customer's description, iPhone 6S still preserves the signal after the SIM card is removed. According to our repair experience, this situation often can be divided into three kinds of situations: 1. abnormal card holder; 2. card detection pin problem; 3. baseband signal part problem. Let's test the main fault before repairing. Install the iPhone to test, we found there is still a signal even if the SIM card was pulled out. According to previous maintenance experience, first we use FLUKE digital multimeter to check the resistance of each pin of the card base, especially the resistance of the card detection pin (that is, the card switch). After measuring, it is found that the card detection pin has no resistance value. At the other end of the R3401, the resistance can be measured, and the fault is determined in the card detection pin, which is broken. Solution: you can use jumper wire to connect directly to the card detection pin without removing the car...

A customer sent us an iPhone 6 Plus to fix it. The problem described was that the iPhone 6 Plus didn't show image or backlight fault. The motherboard had been repaired once. How to repair the problem? Let's check in this article! After receiving iPhone 6 Plus, the appearance of iPhone 6 was not obviously damaged. Use phone opening tools to disassemble the iPhone, take out the iPhone motherboard. Put iPhone motherboard under the Trinocular Stereo Microscope   to observe, we found the iPhone display touch IC of the iPhone motherboard, iPhone light control IC   U1501 and NUT column all have been removed. Moreover, the bottom of the NUT column on the iPhone motherboard has been hit by a long screw.   Use QUICK 861DW  hot air rework station and BGA remove graver  to scrape it, there is no disconnection phenomenon. Measuring the resistance value for the D3# layer of the iPhone display touch power supply IC U1501 by digital multimeter , there i...

We are going to repair a iPad air device today, according to our past phone repair experience, there are several possibilities for an occasional white apple restart problem: - inaccurate battery power - system - NAND ... The faults have to be ruled out one by one. After consulting customers, we get to know the iPad can be reflashed, after reflashing, the iPad still restart from time to time, checking the iPad battery power information is normal, we eliminate the possibility of battery caused. Next, take the iPad apart, remove the NAND chip and replace it with a new one, we want to see if the iPad air NAND chip caused the unscheduled restart. Rewrite the data of new NAND chip on WL PCIE test fixture , and soldering it back to the motherboard. Install the iPad to reflash, all the functions are tested normal, it also does not restart again and again, this fault is due to bad NAND chip caused by unscheduled white apple restart. If you need more professional iPhone i...