![]() We received an iPhone 7 plus, after disassemble and test, we find this iPhone is severely corroded by water. In this case, we can't clean the phone blindly; we should observe the corrosion under a microscope first, and then the corresponding phone schematic diagram to understand the role of corroded components in iPhone. Rip off the motherboard sticker that can be ripped, and remove the iPhone PCB shield cover that can be removed. According observe, we find the most serious is the display backlight part. Now we can clean the iPhone motherboard first, and then measuring power supply C3405 with multimeter, it directly to the ground, careful observation under the microscope found that C3722 was severely corroded. After removal, the diode data of the main power supply becomes 298. At this time, connect it to power and phone standby leakage 30mA, press the iPhone power button, the iPhone screen is lit, but the left screen is dark. Leave it alone, enter the IOS, and insert the SIM card to test, we find there is no 3G、4G, the fingerprint is normal. It not only stuck on fingerprint setting, but also the restore network, restore all settings. Observing it under the microscope, we found that FL3901 corrosion seriously caused the left iPhone backlight IC cannot supply power. After soldering jump wire, it's back to normal. Then found R7109 corrosion damage caused the power supply to high-frequency power amplifier circuit impassability, resulting in no 3G and 4G. After soldering jump wire, it's back to normal. Now we're going to solve the problem that stuck on iPhone. We want to backup first and then brush iPhone, then we found it can connect to PC, but when you connect to iTunes, it times out, dis U2 cause it? So we replace it with iPhone 6S U2 IC, but the problem still exists. So now we directly use DFU mode to forced brush iPhone. However, when the progress bar shows 60%, it reports unknown error 56, re-flash several times, it still the same, the unknown error 56 most caused by NFC. iPhone Baseband CPU、camera power supply could also cause the problem, but these function all is normal, so we judged NFC. Observing NFC under the microscope, we found that it had a little corrosion. Remove the NFC, and measure the diode data of NFC, we found the G2, D5 and C7 all is connect to ground. From the phone circuit diagram, these three points are connected to the NFBST_RF, we directly remove it, G2 still short circuit. After remove the C7517, the resistance is normal; D5 and C7 also back to normal. Replace the chips on motherboard, and weld well, flash it again, it still reports unknown error 56. Water-damaged motherboard power supply is the easiest to burn, so we remove shield cover of iPhone CPU. It can be seen from the schematic diagram, there is a group of power supply PP_VDD_MAIN_NFC converted by NFCSW_RF which from main power supply, so we can weld the jump wire from the A1 pin to the A2 pin. Brush the iPhone again, now it can be successfully brushed iPhone. Enter the IOS system and test all functions, now it is not stuck on iPhone fingerprint setting, seems it was caused by system issues. Now, the iPhone 7 Plus has been repaired! Tips: More iPhone Repair free Skill or other Mobile Phone Repair details, you want to consult, please check here.
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![]() We know that Apple will have device problems in a few months' time, just like iPhone 6S Cannot Boot after Normal Use, how to fix this problem, Now, VIP Pro Shop Team summarizes some practical methods. It's not difficult to deal with the issue if iPhone cannot boot after normal use, firstly observe if the appearance is broken or deformed. 1. Open the iPhone screen to check if there are the traces of water corrosion, battery resistance is normal, then power on and test with multimeter ( 2A am multimeter is recommended ) directly up voltage to 1.8A, it belongs to the symtom of high current. 2.Tear down all the accessories and starting with a single iPhone 6S motherboard, the result is the same, so you can be sure that the accessories or parts are ok. Before we fixed a lot of large current cell phone devices, power on and directly measure value, making sound is basically the components on VCC main power supply get problem, but the situation of current up to 1.8A is still relatively rare. 3.After determining the measurement, we can confirm the problem is from VCC circuit, for big current device, you can use rosin with electric solder iron, apply rosin on the solder iron and work on VCC main circuit components, it will produce white smoke, power on again, you can see Q2300 charging switch tube quickly shine. 4. This will make people think that the booting problem is caused by this parts, according to our experience, it's not caused here. Two circuit power supply. 5. Because this component focuses on B+ and VCC power supply, so it's heating firstly, but it can be determined that it's not bad, for 6S 1.8V device, you can directly focus the problem on backlight part. the backlight part is easy to burn out. 6. Open the iPhone CPU shield (setting spiral hot air gun 260 degrees can easily take off, avoid high temperature, so as to avoid CPU solder explosion), we find the traces of components are burn out on the two backlight diode and C4023, it is best to pack first before processing elements near the CPU. 7. Disassemble two diode and a capacitor and power on again is normal, deal with the solder pad with low temperature solder. you should be gentle when handling it since the pad is easy to fall off. Replacing the new components, reboot and test, every function is normal now. Note: If the diode is installed in the reverse will appear large current phenomenon, after the replacement, you can test again by solder iron with rosin so that will be more intuitive to see whether it is installed, C4023 capacitor must be installed, otherwise it is easy to burn the iPhone backlight IC. This iPhone 6S problem is solved after replacing two diodes and capacitor C4023. Some of the backlight IC and backlight inductance get yellow, which will be required to be replaced. 6S backlight parts are easy to be broken, and the components are all covered with glue. When you remove it, don't be impatient. It will be convenient for the following work after the glue is removed. ![]() How to Fix 2G no service / Not Vibrating Issue on iPhone 6S, Through our professional mobile phone maintenance personnel repeated tests, and finally came to solve the iPhone 6S 2G no service, vibration function not available problem the fastest solution, I hope this article helps all of you experiencing the same problem. Trouble Phenomenon: The iPhone 6s fell into the water, the signal is good, but it can't make the phone call; 2G signal shows no service; the vibration function cannot be used. Repair solution: 1. Power on iPhone, and test it, it has 3G and 4G signal, 2G signal is abnormal, it has no service. 2. Disassemble the iPhone 6s, take out the motherboard, and then connect it to DC power supply, we found it leaking 13mA, the water cell phone 2g signal is not normal. To observe a passing element under a microscope, we found the R4501_RF resistance on 2G PA U2GPA_RF has been moldy, Touch it lightly with tweezers, it fell down. The PP_VCC_MAIN through it supply power to U2GPA_RF, so it caused the 2G signal to be abnormal. Clean it up and weld it with soldering station. After finish it, boot it and test it, the 2G signal is back to normal. 3. The vibration function of iPhone 6s is controlled by U3800 PA chip. Use multimeter to measure the diode data of tail socket, the result is normal. After we remove the U3800 PA chip, we found the solder pad is moldy, so we replace the U3800 PA chip, after that, no leakage when the phone is standby and the vibration function back to normal. The repairs end! Tips: For iPhone 6 Plus Touch, or if you need more professional repair skilled, you want to consult, please check here. ![]() A Apple fans said: "why my iphone7 white apple reboot and reports error 4013, Tell me how to fix iPhone error 4013, That it has lasted for generations doesn’t help me figure out what to do about it now." VIP Pro told us Error 4013 is usually caused by the hardware, though the error says it is an unknown error that occurred, preventing restoration. If it is hardware, then rebooting the device won’t fix it. now, Let's us step by step teach you how to fix it. When we boot iPhone 7 or iPhone 7 Plus, it stuck on white Apple logo, and then it reboots automatically. Connect it to computer with Apple data cable, and brush it with iTunes, the result is iTunes reporting unknown error 4013. This failure is common to the iPhone 6s 6sp 7 7P model. Brush iPhone with iTunes and then it reports unknown error 4013 common fault is usually caused by baseband CPU and 19.2 crystal oscillator. To find out if the baseband caused the problem, you can replace the new iPhone baseband CPU, and the brush it again, see if iTunes will reports unknown error -1. If it does report an unknown error -1, this indicates that the original baseband damage caused that problem. To determine whether it is a 19.2M problem, you can directly replace the new 19.2 crystal oscillator, and then use iTunes to brush it again. It is worth noting that the damaged baseband power supply also can cause this fault. In a word, please be patient with the testing process. Tips: More iPhone Repair free Skill or other Mobile Phone Repair details, you want to consult, please check here. ![]() A lot of people have problems with bad phone screens, and some iphone 7 users complain that their cell phone screens are damaged, and it's expensive to get to the repair shop, Maybe we should prepare some practical tools for their own iphone 7 repair, it will save a lot of money, not to the mobile phone repair shop to repair, now, VIP Pro Shop Team will offer some top guide for repair iphone 7 Screen issue. Recommended DIY - This Tools You Needed:
Before beginning, heat up the device’s interior adhesive strips with a dehydrator, heat gun, or heat mat. Heat guns are the quickest, but use caution as it can be easy to overdo it and damage the device. Open the iPhone 7 Screen: Step 1: Unscrew the two pentalobe screws on the bottom edge of the phone on either side of the lightning port. Step 2: Use the metal spudger to slowly and carefully separate the screen of the iPhone from the body. Start on the bottom edge of the device and proceed slowly. Step 3: Continue using the metal spudger or use playing cards or guitar picks to gently separate the adhesive up the sides and top. Don’t push too deeply towards the center of the device. Step 4:The left side of the screen will open off the body; like a book opened from the back cover. The iphone flex cable connecting the screen to the battery will still be attached so open it carefully. Disconnect the Cables: Step 1: A silver EMI shield on the mid-right side of the phone needs to be removed. It is held in place by four tri-point screws. Step 2: After removing the shield, use a spudger to disconnect the battery from the logic board. Step 3: Use the spudger to disconnect the display connector flex cable. Step 4: Remove the two Philips head iphone 7 screws on the shield over the front panel sensor assembly connector. It is the silver shield near the top of the phone with the flex cable coming out of the bottom. Step 5: With your spudger, disconnect the black front panel sensor assembly connector cable from the logic board. It is the one that connects the screen to the body. Step 6:You can now remove the LCD assembly of the iPhone 7 from the body. Remove the Front Camera and Earpiece: Step 1: we will remove the three Phillips head screws that hold the silver earpiece bracket on the top of the LCD assembly. Step 2: Pull the front camera up and out of the way with your spudger or tweezers. Remove the two Phillips head screws attached to the earpiece speaker. You can now also remove the earpiece speaker. Step 3: Use your spudger to remove the ambient light sensor and proximity sensor. This is a thin cable that is easy to tear so use caution. Remove the Touch ID/Home Button: Step 1: Remove the four pentalobe screws holding the touch ID/home button bracket. Step 2: Work your way around the side brackets on the both sides of the assembly, unscrewing all 6 tri-point screws. Step 3: Peel the large LCD shield away, starting from the top. Step 4: Use your spudger to disconnect the home button cable connector. Step 5: Disconnect the underlying connection with caution. Step 6: Pry the adhesive holding the touch ID/home button to the back of the digitizer. Step 7: The home button is now unattached and can be removed but pushing it forward through the front of the screen. Tips: For iPhone 7 Replacement Parts, or if you need some professional repair skilled, you want to consult, please check here ![]() Many people now choose their own DIY phone fix, and you can also buy some practical and convenient repair tools to fix some cell phone Small fault, repair it yourself at home, it will save you a lot of money, the following article summarizes some of the tools you need to mobile phone repair. Here are some essential tools that VIP Pro Team recommended: Phone Programmer: - Nand Programmer – Naviplus 3000, JC PRO1000, WL, etc - Chip Programmer – ACT PRO, WL, etc Commom Screwdriver Set: - Pentalobe Screwdriver tool kit – Five-Pointed Star Head 0.8mm - Philip Screwdriver – Philip' s head 1.5mm - iPhone Middle Plate Screwdriver – Philip' s Head 2.5mm - Middle Plate Screwdriver – Sleeve Head 2.5mm (iPhone 6s) - Triangle Screwdriver – Triangle Head 0.6mm (iPhone 7/iPhone 7 Plus) Opening Tools: - Blades & Knife - LCD Opening Pliers - Roller Opening Tool - Screen Opening Card - SIM Card Tray Eject Pin - Curved Screen Opening Tool - Big and Small Suction Cup - Stainless Steel Pry Bar - Triangle Pry Piece - Plastic Pry Sheet - Anti-static Plastic Pry Bar - Straight Tweezers - Curved Hook Tweezers Replacement Chips: - iCloud Unlock Chip Kit ( iPhone 6S/ 6Plus) - iPhone CPU - iPhone Nand – 64GB, 128GB, 256GB - Flex Cable - Big & Small Camera - Home button - Motherboard Integrated Phone Fix Platform: - Screw Memory Board - Screwdriver Magnetizer/Demagnetizer - PCB Holder - LCD Heating platform Soldering Tools: - Electric Soldering Station - UV Dryer Lamp - BGA Reballing Stencil - Anti-static SMD Hot Air Welding Station - Solder Paste & Flux - Diagnostic Tools - Electronic Microscope - Digital Multimeter - Desktop Magnifying Glass - Power Supply Tools Cleaning Tools: - PCB Cleaner; - Dust Blower - Anti-static Cleaning Brush - Adhesive Removal Tool Tips: More about iPhone7 information and iphone repair skills, you can view and free consulting VIP Pro Shop Team. Or leave a message. |
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January 2018
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