Vip Pro repair phone

we share phone repair guide, especially for iPhone, and we provide hight quality phone repair tools. whatsapp: +8615767956655 skype: adk_tech (named: bellin)

18.09.2018.

Troubleshooting tips for iPhone iPhone 6S Ringtone problem

Today, we are going to talk about iPhone 6S ringtone problem.This iPhone 6S has no ringtone, no sound when the call coming in. Here are the troubleshooting tips. After received the iPhone motherboard, we install the iPhone 6S motherboard(VC519) 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. Replace a new L3700 coil, install the iPhone to test again, the ringtone fault is perfect solved now! More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team in vipprogrammer.com

10.09.2018.

Troubleshooting guide: iPhone 6S won’t turn on

In this article, we are going to talk about iPhone 6S won't turn on problem. This iPhone 6S motherboard was hit by screws, and then it causes iPhone won't turn on. The troubleshooting guide is here. After we received the iPhone 6S, we test it. The iPhone 6S looks good, press the iPhone power button as usual, the iPhone 6S doesn't have any response. Recharge the iPhone 6S, it also has no response. 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, and all functions tested are normal. NOTE: More iPhone repair guide and cell phone repair tools, please contact China Phonefix Shop Team on vipprogrammer.com

04.09.2018.

Simple Way to fix iPhone 6 Plus no backlight black screen issue

Today, we are going to talk about iPhone 6 Plus no backlight and black screen issues. The iPhone 6 Plus LCD screen has no display after booting, and there is no backlight, just shows black. Also, this iPhone motherboard has been repaired once. There was no obviously damaged was found on the appearance of the iPhone 6 Plus. 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 is no resistance, which is abnormal. After check iPhone schematic diagram on the WUXINJI Dongle, we use QUICK 861DW hot air rework station to solder a jump wire from resistor R0302 to U1501D3#, and then install a good U1501. After installation, measure the iPhone 6P again, now the data tested is normal. Install the iPhone, and turn on iPhone to test, the iPhone displays properly. Get into the IOS and test the all functions on iPhone, all works well! More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

29.08.2018.

Solved: iPhone 6 screen sometimes bright sometimes not

Today, we are going to talk about iPhone 6 screen issue, the iPhone 6 LCD screen sometimes bright, but sometime not. Also, sometimes the iPhone 6 screen screen half bright and half black. Luckily, we can solve this problems, the details are as follows. Turn on iPhone 6 to test, the iPhone LCD screen doesn't display. Disassemble the iPhone motherboard, and observe it under the Stereo Zoom Microscope, we found there are many solder paste on iPhone display socket and iPhone touch socket. Is the iPhone LCD screen not display because the socket is not clean? First we use BGA clean water to clean the iPhone motherboard. Because the customer said that iPhone LCD screen also is half bright and half the screen black state, so, after cleaning, we can use digital multimeter to measure the grounding resistance value for the J2019 display socket 1 pin PP_LCM_BL_CAT2_CONN and 4 pin PP_LCM_BL_CAT1_CONN, these two pins will cause iPhone screen half bright and half black problem. We found the resistance value of 4 pin is 2111, which is abnormal, the normal resistance value is about 570. After a short connection of the FL2025 fuse inductor, the resistance tested is normal. Assemble the iPhone display screen and test it, the Apple logo can be displayed normally, but the backlight still not bright. We noticed that the CPU shield cover was been moved, remove the CPU shield cover, we found the CPU was been repaired. Now, it's easy to explain, the U1502 backlight IC is virtual welded when blowing the CPU by QUICK 861DW hot air rework station, and it leads the iPhone LCD screen sometimes bright and sometimes not. Also, there are many solder paste and tin balls, which is easy cause iPhone motherboard to short circuit. Clean up the tin balls and solder paste, and then remove the iPhone backlight IC. There is a good way to remove the iPhone backlight IC, remove the three filter capacitors above the backlight IC, and then the iPhone backlight IC is easy to remove. Reballing tin and then install the chip, assemble the iPhone and test it,now the iPhone 6 LCD screen displays normally. More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

22.08.2018.

How to fix iPhone X charge failure after dropping?

Today, we are going to talk about iPhone X charge failure, the iPhone X not charging after dropping, the iPhone charge icon displays normally, but not charging. How to fix it? Keep reading. After received the iPhone X, we test it, the iPhone X charge icon can display normally,but iPhone power percentage is getting less when it in charging, this is actually a not charge failure. According to our repair experience, for the dropped damaged iPhone, the L3340 and L3341 inductors of the iPhone charge IC are easy to empty weld and pin missing. Connect iPhone charging cable to the iPhone X tail plug flex cable, and then test the cathode of iPhone battery by UNI-T UT658 USB Tester, no voltage was found, so we judge the fault is in the charging part. If you want to delve into it, we have to measure it hierarchically, the AP part as shown in picture. The external conditions measured are normal, according to our experience, we suspect that the inductors are empty weld and pin missing. Use QUICK 861DW hot air rework station and tweezers to remove the L330 and L3341 inductors, the pins of inductor are on the solder pad, it's like IPhone7, and the inductors are easy to empty weld and missing. Put it under the microscope, and then replace the new inductors( note: if replace it with iPhone 6 inductors, you need to insulate it,otherwise, it's easy to short-circuit.) Measure it by iPhone X logic board test fixture, the functions tested are normal. Connect iPhone with UNI-T UT658 USB Tester, the current all is normal. Now, recharge the iPhone X again, now the charge function works perfectly. Get into IOS to test other functions, all works properly. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

13.08.2018.

How to repair iPhone 6 Recording No Voice Fault

Today, we are going to talk about how to repair iPhone 6 recording no voice fault. Last week, we received an iPhone 6, the problem is that the iPhone 6 has no voice when we use recording function. First of all, replace the U0900 audio frequency chip, we need to make sure whether U0900 is damaged, after replacing it and reinstalling the iPhone 6, the recording function fault is still not solved yet. For a motherboard like this, it didn't get water in before, so we can only consider that the bottom of the board is broken, take off U0900 to measure the resistance value of the bottom pin by Fluke digital multimeter, it is found that the big audio A9 pin has no resistance value. This pin is a clock synchronization signal given to u0900 by the iPhone 6 CPU through the R0301 resistance, and if the circuit is broken, the cell phone will record without voice. This kind of fault must be processed by fly jumper wire and directly from this resistor to the big audio A9 pin. You need to pay attention that the big audio requires very thin jumer wire to avoid the installation of big audio too high or solder connection situation, after flying the jumper wire, you can use green oil solidification, the details will depend on your own skills. Finally, install the iPhone 6, enter the IOS and test it, now the no voice in recording fault has been repaired. More iPhone repair guide and cellphone repair tools, please contact with China Phonefix Shop Team on vipprogrammer.com

08.08.2018.

Solved: iPhone 6S Plus camera failed to work (won’t take photos)

Today, we are going to talk iPhone 6S Plus front camera won't take photos problem. The iPhone camera is damaged, we need to solve this problem. First we carefully observe the socket, the socket is fine, and there are no false weld and rust in the pin position. SO, we need to measure the resistance by Digital Multimeter, and we found the problem,the ninth pin of the socket is shorted. This set of circuits is powered by a power supply directly through the front camera 2.85V of the inductance FL3104, remove the inductance FL3104 by Titanium Alloy Tweezers,we found it's short circuit between inductance and power Y2 pin. According to the experience, first we should try to use the electric shock method (valid for data cables such as straight-through CPU and power supplies, typically with voltages between 1.8 and 3V). After measurement, it is ground short circuit, we can try to fix it by borrowing a voltage from other place method. Use QUICK 861DW hot air rework station to solder the jumper wire from front camera 23 pin photosensitive 3V power supply (be sure to disconnect the FL3104 inductor) Assemble the iPhone, and then get into IOS, test iPhone front camera, now it works properly. More iPhone repair guide and cell phone repair tools, please contact China Phonefix Shop Team on vipprogrammer.com

06.08.2018.

Solved: iPhone 7 Plus vibration function not working

Today, we are going to talk about iPhone 7 Plus vibration function not working issue. The iPhone 7 Plus charge function not working before, after fix the iPhone charge function, the iPhone 7P not vibrating, we need to solve this problem. Disassemble the iPhone, and then remove the iPhone motherboard. First replace a new iPhone vibrating drive IC, but still not working. Then we measure the iPhone 7 Plus by multimeter, no problem found, but just no vibration function. We need to analysis the iPhone schematic diagram in the WUXINJI Dongle to find out working principle of the iPhone vibration IC. It's the same as the ringing,according to the iPhone schematic diagram, and we detected that the M2800 is damaged and causes iPhone 7 Plus doesn't vibrate. Use QUICK 861DW hot air rework station to replace the M2800. Now, measure the iPhone 7 Plus again, all data tested are normal. Finally, install the iPhone, and enter the IOS, the vibration function works perfectly. Note: more iPhone repair guide and cell phone repair tools, please contact with China Phonefix Shop Team on vipprogrammer.com

31.07.2018.

Solved: iTunes reports unknown error 4013 on iPhone 7

Today we are going to talk about iPhone 7 unknown error 7 issue. The problem is that the iPhone has no signal failure, and then we flash it with iTunes, but the iTunes reports unknown error 4013, and failed to enter the IOS, we need solve it. Use Fluke digital multimer to check whether the resistance of each circuit of baseband power supply is normal. The test points of each circuit can be found more accurately based on the WUXINJI schematic diagram, and the corresponding components can be found on the bitmap for testing. After testing, the resistance of baseband power PP_VSW_S4 is only 45, but the normal resistance value should be more than 500. This circuit is connected to main power supply, base band power supply, small radio frequency and large radio frequency. The cell phone can be properly connected without taking into account the main power supply. First, the baseband power is taken down, the resistance is not correct, but i's normal after taking off the large RF resistance. Replace the new baseband power and large RF IC, the reflash process passes smoothly.Plug in card to test, all the functions are normal. The iPhone 7 error 4013 fault is caused by the damaged large RF itself, which leads to the short circuit of the baseband power circuit S4, resulting in the failure of the working conditions. And for iPhone 7 baseband issues,please don't flash iPhone with iTunes, or it will reports unknown error 4013. NOTE: More iPhone repair guide and cellphone repair tools, please contact with China Phonefix Shop Team on vipprogrammer.com

26.07.2018.

How to repair iPhone baseband problem?—Latest Solution

Today, we are going to talk about iPhone baseband problem. The iPhone baseband problem bothers a lot of people, how can we fix it if the iPhone baseband is broken? There is a latest solution in this article. Actually, the first layer of these iPhone motherboard layer circuit lines is very fragile, easy to disconnect or virtual welding, some are not broken by the naked eye, but in fact it is almost disconnected, weak links, at a critical point. Now, let's back to iPhone 7 baseband problem, most people think it is Qualcomm baseband problem, and we think it's still the same as before, it's iPhone motherboard design flaws. Put iPhone 7 and iPhone 7 Plus under the Stereo Zoom Microscope to check, we can see the difference between them. There's ground wire underneath the 83-88pin layer. The iPhone 7P motherboard layer circuit line, four grounding points are connected. The iPhone 7 motherboard layer circuit line, four grounding points are not connected Now, we know that the difference for iPhone 7 and iPhone 7 Plus are that 7P is 4 gnd together, and 7 is 93-98pin connected together Scrape off the circuit place that leaking copper, it is the first layer grounding circuit line. So, now what should we do? According to the above analysis, for the s5 circuit problem, the motherboard board line is almost broken, in a critical condition, resulting in gnd-s5 and even the entire baseband power supply poor working conditions, such as iPhone no service, no baseband, white Apple reboot, and finally complete short-circuit. It's easy to fix it, we just need to use QUICK 861DW hot air rework station to solder a jump wire between 88pin and 93pin,or you can scrape off grounding circuit line and then solder a jump wire. This method is suitable for initial failure, baseband circuits are not low on the iPhone. Some iPhone has been repaired for several times, the iPhone baseband is damaged; the resistance of s5 measured by digital multimeter is lower than normal data. Use above method also can fix it, but it may be has no service or unstable use life issues. After soldering the jumper wire, measure the iPhone logic board again,and then install the iPhone. Get into IOS to test all function, all works well. NOTE: More iPhone repair guide and cell phone repair tools, please contact with China Phonefix Shop Team on vipprogrammer.com


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