Fixed: iPhone 6 Plus Modem Firmware not found (baseband)

Today received an iPhone 6 Plus, this iPhone 6S has no baseband, there is no Modem Firmware on the iPhone Settings.

3D显微镜-VIP

Use phone opening tools to disassemble the iPhone, take out the iPhone motherboard, the iPhone motherboard 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.

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Install the iPhone, and go the Settings, now the Modem Firmware has been shown normally.

Finally, re-install the iPhone amplifier power supply IC, and then test it again, the iPhone baseband is there, the iPhone Modem Firmware displays properly.

Summary:

Perhaps the iPhone amplifier power supply IC was been corroded by water, and then it pulls down the power supply voltage of the baseband.

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Best solution for iPhone 6S recording failure (murmur)

When we use recording function on iPhone 6S, it’s not working well, there is a murmur when the iPhone was recording.  We restart the iPhone 6S and try it again, the recording function still not working well, what’s trouble? Get best solution here!

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Use phone opening tools to disassemble the iPhone 6S, take out the iPhone motherboard, there is no obviously scars.

Open the WUXINJI Dongle to check iPhone 6S schematic diagram, we know that the iPhone recording failure can be caused by  iPhone tail plug socket J4600 or iPhone big audio U3500.

Put iPhone motherboard under the Trinocular Integrated Microscope,  carefully use Titanium Alloy Tweezers to  remove the sponge from the iPhone tail plug socket J4600 to see the capacitance resistor inductance underneath.

After remove the sponge, we found the FL4601 and FL4611 resistor fall off, these 2 resistors will affect tail plug recording and causes murmur.

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Now, we can short connect these two resistors. Use QUICK TR1300A hot air rework station to solder a jumper wire to short connect FL4606 and FL4611.

Finally, install the iPhone, get into IOS to test the iPhone recording function, now it works well, there is no  murmur when the iPhone was recording.

 

 

Solved: iPhone 6S doesn’t boot (damaged PCB board)

A customer sent us an iPhone 6S to repair, the problem for this iPhone 6S is it doesn’t boot. 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.

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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(W006) that hit by screws.

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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.

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Finally, assemble the iPhone 6S and test it, the iPhone 6S can be turned on properly, the problem has been solved!

Repair Guide: iPhone 6 Plus no display and no backlight

Last week, a customer sends us an iPhone 6 Plus to repair, the faulty described is that the iPhone 6 Plus doesn’t display and no backlight, the iPhone motherboard has been repaired once.

MICROSCOPE & MAGNIFYING

After we received the iPhone 6 Plus, 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.

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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.

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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, other functions tested also are normal, the fault has been repaired!

Repair iPhone 6S screen won’t wake up after standby failure

We received an iPhone 6S, the customer described that the iPhone 6S doesn’t display after using it for a while, but the vibration and ringtone works normally. Which means the iPhone is turned on, just the iPhone LCD screen isn’t displayed. The customer said the iPhone was repaired before in other place, after using it for several days, it broken again, and it’s the same failure.

maintenance engineer toolkits

We start to disassemble the iPhone, finding that the screws on the bottom are missing, after disassembling, the screws inside are also missing a lot. This is common failure on iPhone 6S, the repair idea is that the system signal interruption or the power supply and clock are unstable, and most commonly is iPhone display circuit problem.

Although there are many screws missing after disassemble the iPhone, but we don’t found any repair trace of repairing. Considering this iPhone has a low chance of failure,so we start to repair from the simplest way, try to replace the iPhone display assembly. After replacement, test the iPhone for 2 days, it doesn’t have any problems. However, after 2 days, test the iPhone again, the fault is back, seem the real problem is on the iPhone motherboard.

Take off the iPhone motherboard, put it under the Stereo Zoom Microscope to observe, we found the repair trace.

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Looks the previously repair shop also repaired this circuit, use digital multimeter to measure the resistance value of displace interface, the problem was found quickly.

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The data measured for 11 pin is 450, but the 9 pin is 390, it is obviously wrong. Measuring the other end of the inductor, the resistance is 390, until now we can confirm that the inductor is damaged or there is a virtual weld. Re-welding the inductor by using QUICK 861DW hot air rework station, and then measure the resistance for both pins, all is 390. Assemble the iPhone, and test it for few days, the iPhone 6S works properly, the problem of not waking up has been repaired!

iPhone 7 Plus Camera Failure Repair (damaged resistor)

The iPhone 7 Plus camera has some failure, this iPhone 7P rear camera is damaged, it can’t take photos or videos, after testing, we know it is caused by a damaged resistor (pull up resistor). Now, the iPhone 7 Plus camera failure repair way is here.

professional iPhone repair tool

First, disassemble the iPhone 7 Plus, replace the iPhone audio IC and iPhone WIFI module IC,  and then test it, the iPhone camera failure still exist.

Measuring the the grounding resistance value for iPhone rear camera J3001 and J4501 by digital multimeter, the data tested is normal. Measuring the power supply for camera socket, the data tested also it normal.

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Measuring the I2C bus on J3001 and J450,when measured the J3001 2 pin, finding that it only has 0.4V voltage, but in the normal case, the normal voltage of I2C bus should be around 1.8V. Open the WUXINJI Dongle to check iPhone schematic diagram, this I2C bus via safety resistor R3301 to M2600, pull-up supplied by R4604 resistor.

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Put iPhone motherboard under the Trinocular Stereo Microscope, and combine iPhone bitmap to find R4604 resistor.  One side of the resistance value measured of R4604 is normal, the other side is 0.4V, which is obviously wrong,we suspect the pull up resistor is damaged.

With the help of the QUICK 861DW hot air rework station and Titanium Alloy Tweezers, we replace the pull up resistor, and the measure it again, now the both sides voltage of resistor are back to normal.

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Install the iPhone 7 Plus, turn on iPhone and test it, now the iPhone camera works perfectly.

Solved: iPhone 7 doesn’t boot after water damaged

A customer sent us an iPhone 7 to repair, the fault described is that the iPhone 7 won’t boot after dropped into water. For water damaged iPhone, first we need to check the exterior of the iPhone, generally,the part that have been in the water is easy to damage. After appearance has been detected,we need to connect it the DPS DC power supply to check the iPhone status.

3D显微镜-VIP

Connect iPhone motherboard to DC Power supply, no leakage, press the iPhone power button, the current jumps from 200mA, this failure mostly is caused by power supply short circuit, it also can be measured, just check the several power supply circuits that is output by the main power supply.

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After measuring these power supply circuits, we can identify where the short circuit part is.

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When measured the PP3V0_TRISTAR_ANT_PROX this signal, we found it is short circuit. This signal is reached to these place and USB, we can check it on iPhone 7 schematic diagram.

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Directly remove the USB, and then measure the iPhone data again, but the iPhone still short circuit.  For water damaged iPhone, we need to observe iPhone exterior more carefully, and the customer has been repaired this iPhone before, put iPhone motherboard under the Trinocular Stereo Microscope and then continue to observe it.

We found there is a damaged chip, it’s probably the damaged chip that caused the PP3V0_TRISTAR_ANT_PROX to short-circuit. Remove the inductance attached to it, after remove this inductance, we found the resistance value of PP3V0_TRISTAR_ANT_PROX is back to normal. Now, install the USB.

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Press the iPhone power button, now it is normal, but the iPhone always stuck on white Apple logo and won’t enter the IOS system. The current tested by DC power supply is to 2A and then down to 200mA and then stop, we suspect it is caused by iPhone audio problem, the current is normal, but it down to 200mA and won’t move.

After detected, there’s damage on both sides of the audio, use QUICK 861DW hot air rework station to remove the iPhone audio IC and replace the new one. Test it again, now the iPhone can be entered the IOS system quickly. The repairs end!

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Solved: iPhone X not charging after dropped

A customer sent us an iPhone X to repair, the fault described is that the charge icon displays normally, but the iPhone X not charging after dropped. Turn on the iPhone X to detect it, the fault is real. After communicating with the customer, the customer agrees that we should repair the iPhone X.

iphone X 新品

After testing, 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.

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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.

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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 Titanium Alloy 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.)

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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, the fault has been repaired.

Information: Naviplus Pro3000s programmer and Nand non-removal iPad adapter

As for the iPhone repair, we all know that NAVIPLUS PRO3000S is very practical, and now the Nand non-removal iPad adapters for Pro3000s  has been released- iPad 2 3 4 5 6 adapters, they are very helpful for repairing iPad. With the help of the Pro3000s Nand test fixture and Nand non-removal iPad adapter, you can save the repair time and improve the repair efficiency. Here are some information for the Naviplus Pro3000s and iPad adapters.

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1. NAVIPLUS PRO3000S Programmer

NAVIPLUS PRO3000S nand flash programmer is the professional phone repair tool, it used on iPhone 4S 5 5C 5S 6 Plus and iPad 2 3 4, iPad mini and iPad air. The Pro 3000S doesn’t need connect to PC, it comes with 4.3-inch LCD display and touch screen operation, so it’s very convenient to use.

Functions:

– repair iPhone or iPad Nand flash error, such as 4013 4014 and so on

– expand iPhone or iPad Nand flash memory storage

– read the underlying data on iPhone or iPad

– re-write underlying data on iPhone or iPad

– erase data on iPhone or iPad Nand flash (make the empty HDD)

– unlock iPad iCloud

Use manual:

– supply power to Pro3000s

– put iPhone Nand flash or iPad Nand flash in socket

– click buttons of “start repair” or other feature buttons

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2. 3-IN-1 IPad Unlock ICloud Adapter

3-IN-1 iPad Unlock iCloud non-removal adapter for NAVIPLUS PRO3000S, 3 in 1 iPad adapter is for iPad 2 3 4 , you don’t need remove nand from iPad motherboard.

Functions:

– repair iPad 2 3 4 Nand flash error

– expand iPhone 2 3 4 Nand flash memory storage

– read iPhone 2 3 4 Nand underlying data

– write iPad 2 3 4 underlying datas (SN, country, color, Bluetooth and WIFI address)

– unlock iPad iCloud

Use manual:

– plug iPad adatper in the Pro3000S pin-to-pin

– remove the CPU

– for iPad 2 and iPad 3 , only for one nand

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3. iPad 2 3 4 non-removal iCloud unlock adapter

iPad 2 3 4 icloud unlock non-removal adapter need work with Pro 3000S programmer, with this iPad 2 3 4 adapter, you don’t need to remove iPad Nand flash from iPad motherboard, just stay-in-place iPad 2/3/4 nand flash on motherboard. iPad 2 3 4 adapter is independent of each other,so you have the flexibility to choose the adapters you need.

Functions:

– repair iPad 2 3 4 Nand flash error

– expand iPhone 2 3 4 Nand flash memory storage

– read iPhone 2 3 4 Nand underlying data

– write iPad 2 3 4 underlying data (SN, country, color, Bluetooth and WIFI address)

– unlock iPad iCloud

Use manual:

– plug iPad adatper in the Pro3000S pin-to-pin

– remove the CPU

– for iPad 2 and iPad 3 , only for one nand

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4. iPad 5 6 ICloud Unlock Adapter

2-IN-1 iPad 5 6 iCloud Unlock non-removal adapter for NAVIPLUS PRO3000S, iPad 5 6 adapter is for iPad 5 6 (air 1 and air 2), you don’t need remove nand from iPad motherboard.

Functions:

– repair iPad 5 6 Nand flash error

– expand iPhone 5 6 Nand flash memory storage

– read iPhone 5 6 Nand underlying data

– write iPad 5 6 underlying data (SN, country, color, Bluetooth and WIFI address)

– unlock iPad iCloud

Use manual:

– plug iPad adapter in the Pro3000S pin-to-pin

– remove the CPU

– select the Pad 5 6 un-removing option in configuration interface

– first click the “Read” button, it must “Read” successfully before “Write” or “Set/Write”

– there are several NAND models are not supported by Air /Air2 non-removal NAND test fixture.

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