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Showing posts from October, 2017

How to fix iPhone 6S Plus cannot charge?

We got a faulty iPhone 6S Plus,  its problem is  that it cannot charge, even if we replace the new iPhone battery , the problem still the same.  Vip Pro Shop Team tell you how to fix it. The iPhone 6S Plus  reboots frequently and regularly after charging at night, then it cannot be charged on the second day, it was sent to the store to replace the iPhone 6S Plus battery  but invalid. Replace the charging tube, USB controller, field effect on the pipe short, and hit the ground resistance, we did not find any abnormalities. Replace the relevant iPhone IC , the failure can not be resolved. so we take out the motherboard immediately to check .  According to the experience,  we judge the motherboard should be unable to detect battery data. Test the iPhone LCD assembly , press the boot button to trigger the boot function, we found LOGO get lighter than the normal device, enter into the system and connect 3U tools, which really shows no battery data...

Detailed solution for iPhone 6 reports unknown error 56 after flashing

The colleague sends an iPhone 6 to repair, the owner upgraded the iPhone 6, and then uses iTunes to flash it, iTunes reports that failed to restore iPhone, and it occurred unknown error 56. Generally, flash iPhone and then display error 56 is caused by a rear camera  inductor, a capacitor short-circuit or camera power supply. Furthermore, it is caused by dropping pins, virtual welding or disconnecting on NFC chip U5301/U5302. As shown in picture 1. After remove the chip, we found it clearly dropped pins. As shown in picture 2. Combining bitmap  observations, we found that most of them are empty points; There is a place need to solder. Check the motherboard, no disconnection found on it. So, we just need use rework station to solder F7 pin. As shown in picture 3. After finish soldering jump wire with rework station , flash it to "hello" interface. We thought the repairs were over. However, when we get the ID to enter the IOS, and test function, ...

iPhone 6 no service after dropping? Get solution here!

Yesterday, we got a iPhone 6, which fault is no service after dropping.  It has no IMEI on the LCD screen when we input *#06# on the keypad, and it can't search the operator when we insert the SIM card.  Vip Pro Shop Team can give you solution. Base on the faulty description and according our experience, we can make sure that the service error was caused by RF circuit part. Now, we need to fix it step by step. 1. Disassemble the iPhone 6 with screwdrivers , carefully remove the motherboard. 2. Using multimeter   to measure the diode data of testing point PP3172_RF, the result of value is 0. The near place of it is U_DSM_RF, U_HBS_RF, U_ASM_RF, MDM9625M and U_FFER. We can check it in the  Schematic Diagram , as shown in picture 7-13-2, 7-13-3, 7-13-4, 7-13-5. 3. Because we are not sure which chip is causing a short circuit error, so we need to tear down the adjacent chips and test it. We’ve removed several adjacent chips, but the sho...

Repair Apple iPhone 6 has no display after booting

Problem The iPhone 6 can boot normally, but the LCD screen   has no display, just shows black screen. The backlight is normal; it can charge and receive the calls. Solution According the problem description, at first we thought the screws  was broken, after we disassemble the iPhone by screwdrivers , the screws are fine. This iPhone has a corrosive problem which caused by water, but there's nothing wrong with display socket. Test the resistance value with multimeter , all is normal, then we check the power output of Light Control IC   U1501, as shown in picture 7-11-1. After checking, 4-Way power supply is normal, which means the chip is working. Working conditions are available, and the backlight  also boosts, now it should be able to display it properly. However, after test it, it still no display. Now we need to check the signal from display socket to CPU.As shown in picture 7-11-2, 7-11-3, 7-11-4. From the socket then th...

HELP! iPhone 5s keep restart after LCD screen replacement

When replace the iPhone 5s LCD screen , many iPhone 5s  have a bad reaction,  the most common phenomenon is that iPhone 5s keep restarting when it show white Apple.  According our experience, this faulty was caused by installing wrong screw when replace the LCD screen, and maybe the motherboard was broken down. How can we solve it?  First, power off the device and remove the motherboard, we can see the screw  column is damaged when observing with the microscope , there are traces of being pierced. As shown in picture 7-9-2 and 7-9-3. Continue to scrape the motherboard layer, there are four wires were interrupted. As shown in picture 7-9-4 . So we connect the broken wires one by one, and then make green oil  solidification. As shown in picture 7-9-5 . Power on to test, it still reboot with the same symptom, replace U6 and U2 chip, fault is still as before, and the iPhone device reports error 9 at the last, as shown in...

How to fix iPhone 7 Plus does not display after boot

"Something wrong with my iPhone 7 Plus!"  A customer said that. Last week, Vip Pro Shop Team got a damaged iPhone 7 Plus, its owner said that the LCD screen doesn't display after boot. What's going on? Let's find the truth. Connect iPhone to DC power supply, it shows big current. Then we disassemble the iPhone 7 by tweezers, we found it has been repaired, the USB control IC has been soldered, now it is directly on it. As shown in picture 7-10-1. Remove the USB control IC , and then connect the DC power supply , it shows a large current of about 700mA, it has short circuit. We touch the CPU, it's hot, now we are sure the faulty is on the CPU, soldering rosin  on it. As shown in picture 7-10-2. Connect the DC power supply, we found that the CPU  upper was short circuit; in this case, we only can remove it. However, it's difficult to separate the CPU upper, the glue in the middle is hard glue. To do this, just take it slow and ...

6 steps to fix iPhone 6 Plus shows black screen after power on

We got a iPhone 6 Plus from our customer, the problem of this iPhone is shows black screen after power on, and this problem has been repair, but no effect.  When we got the iPhone, we can see that it has been dropped and the display screen was broken. Now, Vip Pro Shop Team will  take 6 steps to solve this problem. 1. Disassemble the iPhone and the power short-circuit current is more than 700 mA, observe the motherboard under the stereo microscope . As shown in picture 7-6-1 and 7-6-2. 2. Backlight IC  is placed directly on the top, we also find that the screw column is broken, there must be a broken line. After the measurement of power supply, it shows PP1.8V, PP1.8_SDRAM are short circuit. 1.8V power supply connected to the original components as shown in picture 7-6-3 . 3. Decisively take off the black touch welding on the 5 large chips and some capacitors, 1.8V short-circuit is excluded. Check the PP1.8_SDRAM power supply, and the orig...

Repair iPhone 6 shows white Apple logo then reboot repeatedly

When we press powerbutton , the iPhone 6 shows Apple logo, and then auto reboot. This situation has been circulating, what's going on?  Disassemble the iPhone 6, then measure the logic eeprom IC diode data with multimeter , the results were 443 and 657,the diode data of AP_BI_EEPROM_I2C_SDA is too large, this case could be caused by iPhone 6 was dropped, the solder pad was disconnected. Today, Vip Pro Shop Team will introduce a new method to solve this issue, solder jump wire  without remove CPU, and just directly scrape the CPU and the solder jump wire. Observe the logic board under the  stereo microscope , as shown in picture 7-5-3. Then start scraping from the upper CPU, according the size of logic board  and scrap it. As shown in picture 7-5-4, 7-5-5, 7-5-6. Find the corresponding point on the logic board, soldering jump wire and paint green UV Fluxes Oil  on it. As shown in picture 7-7-7. Please not...

Step by Step to fix iPhone 6 Plus won't boot and no display issues

The latest iPhone has been released for a while, and there are some problems come with that. But, today, we're not talking about it.  Let's take care of the old iPhone. The iPhone 6 Plus, which has some problems, the touch function, the camera, the LCD screen, and so on. Now, Vip Pro Shop Team will introduce the troubles and show the repair guide step by step. The iPhone occasionally appear touch failure or jump randomly before dropping, it can return to normal after press switch. When repair touch IC , the iPhone 6 Plus fell to the ground, the bottom right corner of the touch screen  glass is broken, and the front camera turned black, but the iPhone still can be used. A few days ago, when turn it on; the screen is blurry when the white Apple LOGO appears and it can't enter the IOS.  Now, it can't boot, and the current is 150mA. GPS antenna was broken and now it shows GPS signal is weak when moving. Repair guide Remove the motherboard (picture 7-3-1), it ...