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)

06.12.2018.

Repair Guide: liquid-damaged iPhone 6S doesn’t boot

A customer sent us a liquid-damaged iPhone 6S to repair, the problem is that the iPhone 6S doesn't boot anymore after dropped into water. Based on our repair experience, this problem mostly is caused by iPhone hardware error (iPhone motherboard problem). Here is a repair guide for fixing this problem. (vipprogrammer.com) After we received the iPhone 6S, test it first. The iPhone 6S has no response after pressing the iPhone power button, the iPhone screen keeps black. Disassemble the iPhone 6S, take out the iPhone motherboard and observe it, the upper of the iPhone CPU is deformed, measure it with digital multimeter, the iPhone CPU upper doesn't shorted. Next measure the iPhone motherboard with DC power supply, the stand-by current is about 0.24A. Measure the diode data of PP_VCC_MAIN, the data tested is lower than the normal value. Check iPhone motherboard under the microscope, we found the capacitor next to the iPhone WIFI IC was seriously blackened. Remove it directly, and then measure it again, now the data tested has more than 100, and the stand-by current tested also is more than 100mA. Carefully observe the iPhone motherboard again, we found that there is a capacitor next to the iPhone audio IC also was seriously blackened. Remove it directly, and then measure it again, now the data for PP_VCC_MAIN is more than 300, and the stand-by current turns to 30mA, but the upper part of the iPhone motherboard is slightly hot. For this problem, we should use rosin method, so we can find out the faulty part quickly. It's found that the temperature of the iPhone display power part is higher than others. Use QUICK 861DW rework station to remove this iPhone display power IC, and then connect iPhone motherboard to the DC power supply to measure it, now the stand-by current is back to normal. Finally, install the iPhone and test it, now the iPhone 6S can turn on smoothly. After entering the iOS system, all functions tested are normal. The repairs end! More iPhone repair guide and cell phone fix tools, please contact with China Phonefix Shop Team on vipprogrammer.com

30.11.2018.

Weak WIFI Signal- iPhone 6SP WIFI signal is weak- how to fix?

Today, we are going to talk about iPhone 6S Plus weak WIFI signal problem. When connect to the WIFI, the iPhone displays "can't join this network". Why is that? How to fix it? More details, please keep reading. After communicated with the customer, we know that this iPhone 6SP was fell into the ground before, and then the iPhone WIFI has problem.Now, we are going to fix it. After disassembling the iPhone, carefully take out the iPhone motherboard, and then attach iPhone motherboard to to universal PCB holder fixture. First, we need to check iPhone WIFI IC. Remove the iPhone WIFI IC, and then observe it under the microscope, we found there are many pin are missing, and most of them are useful pins. For the iPhone 6S and later model, if we want to replace the WIFI IC, we have to unbound the WIFI on the iPhone Nand flash. So, remove the iPhone Nand flash, and then use JC P7 Nand programmer to program the unbound the WIFI, and then re-install it to the iPhone motherboard. Next, use QUICK TS1200A hot air gun to solder the jumper wire and fill the missing pins on iPhone WIFI solder pad, we need to re-fill all of the useful pins, and then install the iPhone WIFI IC to the iPhone motherboard. Finally, assemble the iPhone 6S Plus, the iPhone is turned on smoothly, and then test the iPhone WIFI function, now the iPhone WIFI signal is back to normal, the iPhone WIFI function can be used properly. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop team on vipprogrammer.com

26.11.2018.

iPhone 6S handset no voice during the call- how to fix?

Today, we are going to talk about iPhone 6S handset not working problem, the iPhone 6S handset has no voice during the call, but we can hear the voice when it is in speaker mode, how to fix it? According to our repair experience, the iPhone receiver no sound, but the iPhone speaker can hear the voice, this problem is usually caused by iPhone receiver, receiver flex cable, receiver circuit or iPhone audio IC(VC530) problems. Replace the receiver and flex cable first, and then test the iPhone 6S, the failure still exist. Now we need to check iPhone receiver circuit. Use digital multimeter to measure the diode data of receiver signal 1 pin and 3 pin that on the connector J3100, the data measured are normal. Check iPhone schematic diagram via WUXINJI Dongle, we know that the 1 pin and 3 pin of J3100 are through capacitor FL3153 and FL3154 to iPhone audio IC U3500, their diode data are normal, which means the capacitor FL3153 and FL3154 are normal. Now, we need to check iPhone audio IC part. Take out the iPhone motherboard, we found the U3500 has been replaced before by other repair man, the several filter capacitors around it has been removed, and there is a power supply IC of NFC also has been removed. Now, we need to fix iPhone receiver failure, directly replace the iPhone audio IC U3500. After replacement, connect iPhone 6S to the DC power supply, the trigger current jumps from 0 to 80mA, it's been circulating like this. The replacement IC has been soldered well, the iPhone CPU didn't been blown by QUICK 861DW hot air rework station. Remove the iPhone audio IC, now the current is back to normal, so we confirmed that it's the problem of the iPhone audio IC. Replace it with new iPhone audio IC, and then install the iPhone. After installation, press the iPhone power button, the iPhone 6S is turning on smoothly. After get into the IOS, test the iPhone handset, now the iPhone handset can hear the voice successfully during the call. The repairs end! Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

21.11.2018.

iPhone 6S won't turn on after drop into water—how to fix?

We received an iPhone 6S to repair, this iPhone 6S won't turn on, it's damaged by water, so we need to disassemble the iPhone 6S to check iPhone motherboard. Disassemble the iPhone 6S by phone opening tools, connect iPhone motherboard to the DPS DC power supply, it leaks 120mA, after triggering, the current is stuck in 360mA. Remove the iPhone motherboard, and observe it, we found the iPhone baseband power IC, NFC IC, iPhone big audio IC and iPhone display power IC all have traces of water. Clean up the iPhone motherboard with iPhone PCB cleaner, and then connect it to the DC power supply again to observe the current, now the current turns to 80mA, after triggering, the current is stuck in 300mA. At the same time, we found the iPhone display power IC was repaired before, and the corner of iPhone display power IC was damaged. Remove the iPhone display power IC, re-connect to DC power supply, the iPhone motherboard is no longer leaking. Trigger it again, now the current is stuck in 240mA. According to our experience, the current directly ups to 240mA after triggering, it should be caused by power supply short-circuit of LDO that output from the iPhone main power supply. Use digital multimeter to measure the diode data of the LDO power supply that output from iPhone main power, we found the fingerprint 3V power supply was short-circuited. For the short-circuit problem, we should use rosin method. First smoked the fingerprint 3V power supply area till it turns white color, and then add 3V voltage to the fingerprint 3V power supply position, we found the rosin of a capacitor melted. Check iPhone PCB bitmap via ZXW Dongle, we found this capacitor is C4104. Remove the C4104, and then measure the diode data of fingerprint 3V power supply again, now the data is back to normal. Connect it to the DC power supply, the current is normal. Now, the iPhone 6S can be turned on smoothly. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

16.11.2018.

Solved: iPhone 6P No Touch After Dropping

An iPhone user complained that his iPhone 6P no touch after dropping, the iPhone screen doesn't response to his touch. Actually, we've met this problem before, the iPhone 6 Plus accidentally fell into the ground, but it still can be turned on, just no touch. In this article, we will share the repair method,so you are facing this problem, you can try to fix it by following methods. First, try to solve it by replacing iPhone screen. After the screen replacement, test the iPhone, the iPhone 6 Plus still no touch. We need to check iPhone motherboard, we can remove the iPhone touch IC first. As we know, there are 2 ways to remove the IC: one is remove it by tweezers; the other one is pry it from the side the IC. Remove the iPhone touch IC and the re-install it, the iPhone 6 Plus auto restarts when the white Apple appears. Measure the iPhone by DC power supply(VIP727), the boot current jumps from 300mA. Take off the iPhone touch IC again to measure the resistance of the bottom of the board by digital multimeter, the resistance value measured is normal. Because the boot current is larger than normal value, so we are going to measure the boot current after removing the U2 IC, but the problem still there. Measure the resistance value of the bottom pin of the iPhone U2 IC, we found the F4 pin PP3.0V is short circuit. After check iPhone schematic diagram via WUXINJI Dongle, we know that this circuit has big power, fingerprint power supply and U5411_RF. Supply power to the iPhone to boot it again, we found the U5411_RF is overheating, remove the 2 components that next to the U2, the iPhone is turned on, we confirmed that this iPhone problem is caused by damaged U5411. The iPhone boot current jumps from 300mA, the iPhone displays white Apple and won't enter the iOS system. Installing the iPhone touch IC, the new faults comes out after testing, the iPhone has no service and no IMEI after booting. For this drop-damaged UMT motherboard baseband failure, remove the iPhone baseband CPU, and use QUICK 861DW hot air rework station to solder the jumper wire to V1 and U1. After handling the iPhone CPU, install it back the iPhone motherboard, and then assemble the iPhone. Press the iPhone power button, the iPhone 6 Plus is turning on as usual. Next to test the iPhone screen, the iPhone screen is response to our touch normally, the touch function is back to normal. Entering the IOS system to test other functions, all functions tested are normal. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

14.11.2018.

Repair guide: iPad 5 doesn’t boot

After pressing the iPad power button, it has no response, the iPad 5 doesn't boot. What's going on? How to repair it? Here is the repair guide! First connect iPad to the DC power supply, trigger it to test the current, the current stuck in around 40mA. Connect iPad to the computer and DFU restore it, it reports error 40. After entering the restore mode, we found the SN can't be identified. According to the error code, we judged that it's the problem of iPad Nand flash or the circuit of the iPad Nand flash. Disassemble the iPad 5, take out the iPad motherboard, we found the iPad Nand flash has the trace of disassembling. Measuring the 1.8 and 3.3V of the iPad Nand flash, both doesn't have the power supply. Check iPad schematic diagram via WUXINJI Dongle, we can know that power supply for both sets of circuits is converted from U3850. Because the iPad Nand flash was disassembled, so we suspected that the power supply tube was virtual welding. Re-install it, the power supply is back to normal, but the iPad still won't turn on. Now we need to use QUICK 861DW hot air reworks station to remove the iPad Nand flash, after remove the iPad Nand flash, we found some pins of the solder pad are missing. Refill the solder pad, installing the iPad Nand flash to the iPad motherboard. Measure it again, now the data tested is normal. Assemble the iPad 5, press the iPad power button again, now the iPad can be turned on smoothly. Tips: More iPhone/ iPad repair guide and cell phone fix tools, please contact with China Phone Fix Shop Team on www.vipprogrammer.com

07.11.2018.

Best solution for liquid damaged iPhone 7 won’t turn on issue

Today, we are going to fix liquid damaged iPhone 7 won't turn on issue. The iPhone 7 was damaged by liquid, it is not turning on, and the iPhone vibration and voice function are not working. Here is the best solution for it. Use DC power supply to measure the iPhone motherboard, the iPhone leaks 900mmA and it's triggered. Remove the iPhone 7 motherboard, after careful observation, it was found that the capacitor c2307 was broken. To make matters worse, when we observed the motherboard with 180X stereo zoom microscope , we found that the two large audios under the capacitor were corroded. Capacitor c2307 falls into the water part for cleaning. After power-on, it finds that the leakage is 100mA, and the iPhone can be turned on smoothly. The vibration or sound function tested are not working after the iPhone is turned on. Remove the both iPhone big audio IC, and then measure the diode data of the u3402 A2 pin, the data is 30, while the normal data is more than 300. Based on iPhone schematic diagram, we know the A2 pin is connected to only M2800. It seems very likely that the M2800 was damaged, so we need to replace the M2800. After replacing the chip, measure the U3402 A2 pin resistance is normal. Now we need to replace iPhone audio ic , after replacement, measure the iPhone again, now the iPhone data is normal. Finally, install the iPhone 7, the iPhone 7 can be turned on properly, and all functions tested are normal. More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

30.10.2018.

Troubleshoot: iPhone 6 Plus reports headphone mode when using speaker

Today, we are going to talk about iPhone 6 Plus speaker and headphone problem. The iPhone 6 Plus always in headphone mode, when turn on the speaker, it has no sound. After checking,we know that this failure is caused by damaged iPhone audio IC, the earpiece is not plugged into the iPhone, but the iPhone still shows the earpiece mode and the speaker no sound. How to troubleshoot it? Here is the solution. The iPhone tail plug cable J1817 earpiece insert detection signal HPHONE_TO_CODEC_DET_CONN is abnormal, generally this phenomenon is caused by iPhone tail plug flex cable and iPhone audio IC. Use phone opening tools to disassemble the iPhone, disconnect the iPhone tail plug flex cable, and now check the iPhone to see whether the iPhone is in earpiece mode. After observation, the iPhone 6 Plus still is in earpiece mode when the iPhone tail plug flex cable is disconnected, it seems that it is not the issues with the iPhone tail plug flex cable. Take out the iPhone motherboard to check iPhone audio IC. Use QUICK 861DW hot air rework station to heat the iPhone audio IC U0900, and then use tweezers to remove the U0900 IC. After movement, install the new iPhone audio IC U0900. Now install the iPhone and test it, the iPhone speaker works normally, other function tested also are normal. Note: More iPhone repair guide and cell phone fix tools, please contact with China Phonefix Shop Team on vipprogrammer.com

25.10.2018.

Solved: iPhone 6 No sound when recording

Today, we are going to talk about iPhone 6 no sound failure. Sometimes, the iPhone ringtone option will be stuck when we want to turn it on, the record icon can be turned on, but no sound can be recorded. Based on our repair experience, possibly this error is caused by iPhone small audio IC. Disassemble the iPhone, and take out the iPhone motherboard, we found that the large audio and the small audio have been replaced. As the case revealed, the culprit possibility of the chip itself is very small. Remove the iPhone small audio by iPhone opening pry tool, and testing the small pad ground value of the pad, finding that the small audio F6 foot resistance is infinite (normally around 400) This is the small audio I2S bus, to the big audio and CPU. If refer to the big audio, removing the big audio, if it cannot work, you can consider to change the big audio ic, test the pin connected with the small audio F6 foot, the value is normal, it seems that from here to install the jumper wire to the small audio is all right. When the jumper wire is soldered well, install the iPhone 6, and test it. Now the iPhone record function works properly, test the other functions on iPhone, all works well. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com

16.10.2018.

How to fix iPhone black screen after booting(low display boost)

Today, we are going to talk about iPhone 6S black screen issue. After booting the iPhone 6S, the iPhone screen keeps black, it doesn't display. How to fix iPhone black screen then iPhone is turned on? Get solution here! 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. Note: More iPhone repair guide and cell phone fix tools, please contact China Phonefix Shop Team on vipprogrammer.com


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