Apple iOS12.1.1 Three Problems & Solution

iOS12.1.1 is available right now for all iPhone, iPad, and iPod touch models capable of running iOS12. The iOS12.1.1 update isn’t as big as iOS12.1, but it still delivers useful performance improvements and important bug fixes for iOS12 problems. Here, we list three problems of iOS12.1.1 and solutions for those issues. Following now.
iOS12.1.1 Problems / How to Fix the Problems
Although iOS12.1.1 update brings new features and bug fixes. However, it also brings some problems. We’re already seeing complaints about the iOS12.1.1 download and installation, abnormal battery drain, slow Wi-Fi, problems with Touch ID and Cellular network connectivity issues. Check the following to see what are the problems of iOS12.1.1 and how to fix them.
Problem 1: Displays 4G network can not access the Internet
There is plenty of feedback from iPhone XS and iPhone XS Max owners and the upgrade of iOS12.1.1 has caused the problem that the 4G network cannot be connected. The specific problem is that although the iPhone displays 4G LTE network, but can not open the webpage with Safari, some social network APP cannot send messages.

Solution: How to fix iPhone can’t access the Internet
At present, Apple has not given a solution for this issue. Some users tried to restart or reset the network but that did not solve the problem. In the previous guide, we have already talked about iPhone no services and iPhone WiFi connection failure problem. If you have an iPhone X or later iPhone devices, and unfortunately, encountered a similar situation after upgrading ios12.1.1, it is recommended to restart your iPhone and downgrade to iOS12.1.
How to downgrade iOS
1. Download the appropriate IPSW file for your iPhone or iPad.
2. Make sure iTunes on your computer is the latest version. If not, download and install it.
3. Connect your iPhone or iPad to your computer and then click on your device when it appears.
4. Under the Summary section, click the Check for Updates button while holding Shift (Windows) or Option (Mac).
5. Now navigate to and choose the IPSW file you downloaded.
6. Your device will be ‘updated’ to iOS 12.1.
Problem 2: iOS12.1.1 touch screen issue on iPhone
Many users complained that their iPhone, iPad or iPod touch’s screen not working as normal after iOS12.1.1 updates, like touchscreen unresponsive when calls come in, touch screen stops responding, and etc.

Solution: How to fix iOS12.1.1 touch screen not working
In previous repair guides, we have shown iPhone touch screen not working with hardware, iPad touch screen unresponsive, iPad ghost touch issue and etc.. REWA offers iPhone screen repair services for repair shops, you may get a quick response and fix from us. Here are the methods to fix iOS 12 touch screen not working problem.
Let’s dive in:
iPhone 7 touch screen not working
iPad Air touchscreen partially unresponsive
iPhone 7 frozen screen fix
iPad Air ghost touch fix
1. Restart Your iPhone: Press and hold down the wake/sleep button and drag slide to power off, and then turn on your iPhone touch after a few seconds.
Reset Your iPhone: If you cannot restart your device, then you can try this method. Hold down the on/off button and the Home button until the screen turns off, then keeping holding them until the Apple logo appears.
2. Clean Your Screen: Check your screen to see if there are some oily or liquid splits and clean the screen with soft cloth. If you have a screen protector, you can remove it to have a try.
3. Restore Your iPhone: if the screen still not responding, then you can restore your devices as new to have a try.
Problem 3: iOS12.1.1 battery issues on iPhone
According to the battery issues happened after updating to iOS12.1.1, and the latest issues reported by iOS users, here we list the most common battery issues you may meet after updating to iOS12.1.1.

• iPhone battery draining fast
• Abnormal bad battery life issues
• The iPhone heats up randomly and battery goes down fast

Solution: How to fix iOS12.1.1 battery issues on iPhone
1. Reset the setting: Go to Settings > General > Reset > Reset All Settings to factory default.
2. Enable Low Power Mode: Go to Settings > Battery > Turn on Low Power Mode.
3. Make display & brightness adjustments: Go to Settings > General > Accessibility > Display Accommodations > Auto Brightness.
4. Disable iCloud Keychain: Go to Settings > Apple ID > iCloud > Keychain then toggle it off and on.
5. Turn off Location Services: Open Settings APP > Privacy > Location Services > Turn it off. Or you can also set it to enable the services while using the app.
6. Restore the device. It can erase all the settings and content on your device, so this is the last option. You can first restore from one backup to have a try, if it does not work then you have no choice but to restore your device as new.
About iOS12.1.1 new features and upgrade, you can go REWA blog to check.

Newly Launched - iPhone 8/8Plus/X back glass separating with laser machine

For iPhone X, iPhone 8 Plus and iPhone 8, the biggest difference from its previous generation is that both the front and back cover are glass.  Among other things, this glass back enables the iPhone 8’s wireless charging capabilities. The phone’s glass back is gorgeous, but also makes it vulnerable. Although Apple says the iPhone 8 has “the most durable glass ever used in a smartphone,” However, it’s glass, after all, you know, glass, which is prone not only to shattering, but also scratching and other light damage over time. Better not drop your iPhone X. If it’s damaged, you’re in for a nasty surprise: The most expensive smartphone on the market is also the most costly to repair.

However, believe it or not, breaking the fancy glass back on the iPhone X will do more damage to your wallet. Cracking the screen can be an expensive business, you need to pay $279 to fix a broken screen. As for the broken back glass, rather than counting as a screen break, it’ll fall under the “other damage” fee which is $549(according to Apple’s repair pricing page)

And the back glass is fragile and extremely difficult to repair. The back glass is connected to the iPhone X’s housing with both glue and tiny welds, meaning there’s unlikely to be a simple way of removing and replacing it anytime soon.
Luckily, there are options out there for separating back glass of iPhone X/iPhone 8 Plus/8. We have introduced Grinding Tool to finish iPhone 8/8P/X back glass refurbishing, which is a cost-effective way, and another efficient way – iPhone 8/8P/X back glass refurbishing with 3 in 1 separating machine. Today, we bring a newly launched Laser Separating Machine has surprised the market with powerful features. It can separate midframe/bezel/back glass of more than 50 smartphone models, including iPhone X/8 Plus/8 in a safe and quick way. Is that deserve? Let’s check the iPhone X/8 Plus back glass separation with the Laser Separating Machine video to get an in-depth understanding of the machine.

Black Friday Sale 2018 - Worth to check

The annual Black Friday shopping frenzy is fast approaching. Black Friday heralds the start of the Christmas shopping season and is an ideal opportunity to buy festive presents at a cheaper price.
Together with its more recent online counterpart Cyber Monday, the sales have become a major global event over the past few years as online shopping has brought the bargains to the rest of the world. Here, our REWA pick of the best sale of repair tools  so far.
When is Black Friday 2018?
Black Friday takes place the day after Thanksgiving, which falls on the fourth Thursday in November and this year it falls on November 23, followed by Cyber Monday on November 26.
PCB Holder for iPhone X

2 in1 Repair PCB Holder for iPhone X. More easy to fixed the Logic board repair and positioning plant tin. Just put the magnets at the bottom and then It second change magnetic plant tin holder. Two types available, here are your options:
PCB Holder for iPhone X – MJ – A23
Cellphone Repair PCB Holder for iPhone X – AM – Type 2
Soldering/Desoldering Rework Station for iPhone X

As we all know that iPhone X has double layers logic board. It is hard to desolder the upper and lower motherboard. This Tool can easy to solve the iPhone X Motherboard Soldering/Desoldering  issue.
Microscope

Microscopes are usually used in logic board repair. This Electron Microscope can dynamic observation and inspection of gadget, capturing, recording, saving, and timing capture. Realize window and partial magnification detection. Accuracy up to 0.001 mm.
Multifunctional PCB Holder

A multifunctional is integrated into one PCB holder for iPhone X. Like iPhone X logic board chip fixture, fast fix safety tin planting, protect the lower circuit, no risk of the leakage, remove hard drive into knife port and more.
Screwdrivers

Screwdrivers essential tool as for a repair person. It can be divided into slotted, Phillips, Pozi, Torx, Square, and Hexagonal and more according to screwdrivers head. Here are your options:
Torx Screwdriver
Pentalobe Screwdriver
Tri-wing Screwdriver
Phillips Screwdriver
Hexagon Screwdriver
Tweezers

Different occasions require different tweezers. In general, you should prepare straight and curved for need.
Straight Tweezers
Curved Hook Tweezers
10 in 1 Glue Removing Blade for CPU

10 in 1 Glue Removing Blade for CPU born to meet your needs. Various size choices, suitable for remove kinds of chips, CPUs and etc. Not only Shovel, hook, cut, pry, but the blade with scale so that the repair person can more easily and more accurately take apart the CPU rather than breaking it.
Precision Tool Kit

Since there are many different lengths and thicknesses of screws, sometimes it is necessary to prepare many different screwdrivers. Precision Tool Kit not only safe, efficient, and compact, it also combines the advantages of electric and manual. It is a precision repair tool and a future tool.
LCD Disassembly Tool

Simplest way to pop open a phone screen. Multi-angle screen sucker clamp, easier to take apart every gadget you want. Including two screen protectors, protect your phone scratch during the disassembling.

Broken Samsung Note 8 Glass Screen Refurbishing Guide

The era of the curved screen has arrived since the release of Samsung S6 Edge. After years of development, a brand new curved full screen has been adopted, which comes as a combination of curved screens and full screens. Compared with curved screens, the new curved full screen undoubtedly bears a much higher repair/refurbishing cost. In our video today, we will take Samsung Galaxy Note 8  as an example and show you the latest curved full-screen refurbishing technology. Our REWA is willing to share repair tips with you and helping to solve your issues. Now, following REWA to restore your broken  Samsung Note 8 glass screen to a new condition.

 

The above is the complete process of Samsung Galaxy Note 8 broken screen glass repair. Have you got it? If NOT, watch the video below. Meanwhile, have you met any problem during the crack screen refurbishing? If YES, welcome to share with us at comment below or ask forum. Our REWA is willing to share repair tips with you and helping to solve your issues. As an old saying “ if three walks together, one can be my teacher”. We can learn from each other.

OCA Film - All You Need To Know

In this post, we will share all about the OCA film what you want to know. First, let's start with the brief introduction to OCA adhesive glue:
1) So far in the cell phone repair and refurbish industry and consumable material market, there are the different type of OCA glues custom made for iPhone, iPad, Samsung, LG, Motorola, Sony flagship models.
2) OCA optical clear adhesive film is also one of the important raw materials for mobile phone touch screen.
3) The OCA Tape is a highly-specialized film that offers excellent clarity, light transmitting and adhesion to a wide variety of transparent substrates. OCA Optical Adhesives are usually applied in transparent applications, such as in smartphone and tablet PC LCD displays, touch panels and other devices requiring an optically clear bond.
4) These OCA Clear Adhesive Films perfectly fit with your device and need no cutting before applying such as LG G2, G3, G4, Motorola Moto G2, G3, G, Sony Z4, Z5, Samsung Galaxy S6, S6 edge, S7, S7 edge and so forth.
5) We highly recommend professional installation. We won’t be responsible for any damages to your cellphone/mobile phone that you may cause during the replacement for your defective phones.
6) Easy to remove with no glue residue by using the special OCA Adhesive Remover.
OCA Structure

Size Inspection

OCA Type Thickness	Mitsubishi 250um	Mitsubishi 200um	China Made 250um
Whole OCA	0.49mm	0.44mm	0.37mm
release film 1	0.10mm	0.10mm	0.05mm
OCA	0.25mm	0.20mm	0.23mm
release film 2	0.05mm	0.05mm	0.09mm
protective film	0.09mm	0.09mm	/

OCA Type	Mitsubishi 250um	Mitsubishi 200um	China Made 250um
Length	107.07±0.25mm	107.07±0.25mm	107.35±0.25mm
width	61.07±0.25mm	61.07±0.25mm	61.14±0.25mm

Visual Inspection
On the whole, China made OCAs sometimes have problems of smudges, dots, excessive glue, air bubbles, creases and so on compared with Mitsubishi OCAs.

Function Test
As for the OCA film function, we do light transmittance test, release film test, adhesion test, laminating test, bubble removing test, bubble returning test and repair test to explain.
From the test we can draw a general conclusion: Mitsubishi OCA is better than the China Made ones in term of quality. Details report please go blog.rewatechnology.com to get.

iPhone 7 bome button repair - upgraded customized charging port flex

We have already introduced a solution for iPhone 7 defective home button repair with a historic part— Customized Charging Port Flex, which can help you restore the return-to-home function when you get a defective iPhone 7 home button. After further researching and testing, now the upgraded versions for iPhone 7 and 7 plus are available. Let’s see what we will get with the customized upgraded charging port flex cable.

customized charging port flex

• Restore return-to-home function
• Support PD fast charging
• Support different type of charger adapters from 0.5A-2.4A
• Be able to take screenshots on all iOS versions
• More comfortable touch feeling

Read full article please go upgraded parts for iPhone 7 home button repair

Solution for Samsung Galaxy S8 Plus not charging

It’s alarming if your phone is not charging. Because it’s a signal of a device’s hardware trouble, including battery. However, we can not simply make a hasty generalization with the instances that a cellphone cannot charge. We need to troubleshooting, meanwhile, and have an idea about what the trouble really is with the cell phone.

In this post, We will teach you how to troubleshoot not charging Samsung Galaxy S8+. As an owner, you need to take some time to troubleshoot your Galaxy S8+ to check if the problem is only a minor glitch in the gadget? or hardware issue that needs to replace ICs? So, here’s what you need to do…
Here is the video to fix Samsung Galaxy S8 Plus not charging, video gives more info what you need to know of the fix steps.

If you want to see the details steps with picture and words of solution for Samsung Galaxy S8 Plus wont charge, you can go blog.rewatechnology.com.

iPhone 8 back glass repair - a cost-effective way

iPhone 8/8P/X back glass is fragile and difficult to repair because it is connected to the housing with welds and glue. We have already released an article about how to repair iPhone 8/8P/X broken back glass with a Separator  for large quantities of broken back glass refurbishment. Today we are going to introduce a new Grinding Tool to finish iPhone 8/8P/X back glass refurbishing in a cost-effective way. That is to say, there are two ways available for you to fix broken back glass iPhone 8/8P/X. Each has their advantages and disadvantages, details please check below. Which way will you choose? Welcome to leave your answer at comment below.

Now, let’s see how we repair iPhone 8/8P/X broken back glass with a new way.
Warning: Safety glasses and Anti-cutting Gloves are necessary for non-professionals.

MacBook won't turn on repair tutorial

For repair technicians, their repair work usually goes differently, since the problem can be fixed and solutions may be flexible. For our MacBook Air won't turn on repair case today, in order to demonstrate a complete repair process, we started from main power supply inductor in this video. The fault is finally confirmed as to be caused by fuse damage due to short-circuited capacitor on the main power supply circuit. Actually, you can find the problem directly based on experience if you are an old hand. REWA never lets you down and always has an EFI chip solution for MacBook unlock repair for you.
Now, check our video for more detail about MacBook Air Won't Power On

Attaching the list of the tools used in the video. Welcome customers in need of inquiries. We will help you with whatever you need.
*Hot Air Gun Rework Station
*Soldering Iron Rework Station
*Digital Multimeter
*DC Regulated Power Supply
*Straight Tweezer
*Paste Flux
*Solder Wire
*PCB Cleaner
*Anti-static Plastic Pry Bar
*Soft Brush
More the repair tutorial about MacBook, please check the following to see

• How To Unlock MacBook By Removing EFI Password?
• How To Upgrade RAM On MacBook Air?
• 5 Minutes Done – MacBook No Display Repair
• How To Fix MacBook Pro Won’t Turn On

Apple 2018 new iPhone rumores

Apple is rumored to be introducing three iPhones in this year: Two OLED models are known as iPhone Xs with 5.8 and 6.5 inches, and an LCD model features with 6.1-inch. All three will feature Face ID and edge-to-edge displays nearly non-existent bezels of the iPhone X, and all will be equipped with a TrueDepth camera system that supports Face ID…

The 6.1-inch iPhone features an LCD display, a single-camera, is cheaper than the other two iPhone models, and naturally costs the lowest of the three iPhone’s. The 5.8-inch and 6.5-inch iPhone, on the other hand, have an OLED display and dual cameras, and the overall design is not much different from the iPhone X, and Apple may introduce a new color match to differentiate it from the iPhone X.

The feature set of each of the three iPhones expected in 2018

In addition to Face ID and a TrueDepth camera system, all three of the new iPhones are likely to include an upgraded A12 processor, improved LTE chips from Intel (OLED models only) that will support a faster LTE connection and a USB-C to Lightning cable for faster-charging speeds. With the launch of the 5.8-inch iPhone Xs and the larger 6.5-inch iPhone Xs, rumors suggest Apple may flat out discontinue the current iPhone X rather than lowering its price tag and selling it as a lower-cost older-generation device.

Apple is planning to unveil its three new iPhones at an event set to be held at 10:00 a.m. Pacific Time on September 12 at the Steve Jobs Theater on the Apple Park campus.we can expect to see it then.

Furthermore, REWA has OEM NEW iPhone Xs Plus and iPhone Xs Power Switch Flex Cable and Ear Speakersupply, welcome customers in need of inquiries. We will help you with whatever you need.

How much do you know about OCA Film?

The brief introduction to OCA adhesive glue:
1) So far in the cell phone repair and refurbish industry and consumable material market, there are the different type of OCA glues custom made for iPhone, iPad, Samsung, LG, Motorola, Sony flagship models.
2) OCA optical clear adhesive film is also one of the important raw materials for mobile phone touch screen.
3) The OCA Tape is a highly-specialized film that offers excellent clarity, light transmitting and adhesion to a wide variety of transparent substrates. OCA Optical Adhesives are usually applied in transparent applications, such as in smartphone and tablet PC LCD displays, touch panels and other devices requiring an optically clear bond.
4) These OCA Clear Adhesive Films perfectly fit with your device and need no cutting before applying such as LG G2, G3, G4, Motorola Moto G2, G3, G, Sony Z4, Z5, Samsung Galaxy S6, S6 edge, S7, S7 edge and so forth.
5) We highly recommend professional installation. We won’t be responsible for any damages to your cellphone/mobile phone that you may cause during the replacement for your defective phones.
6) Easy to remove with no glue residue by using the special OCA Adhesive Remover.
Next let’s get a more comprehensive understanding and view of the OCA Adhesive Glue in the aspect of dimensions, property and function of different manufacturers which are Mitsubishi OCA and China Made OCA.
Function Test
1) Light Transmittance Test
The value of visible light test should greater than 90 in terms of qualified OCA glue.
Mitsubishi 250um                                  China Made 250um
2) Release Film Test
Stick the corner of the OCA protective film with easy peel/tear label to see if it can rip off easily. Mitsubishi OCA outperforms China Made in the test.
China Made 250um                               Mitsubishi 250um
3) Adhesion Test
Stick the OCA Optical Clear Adhesive film to one clean cell phone outer glass lens to test if it has strong stickiness and is easy to tear up after fitting.

4) Laminating Test
In the course of LCD screen display laminating and outer screen glass laminating process we can easily check if the OCA can be easily laminated. There is no obvious difference between Mitsubishi OCA and China Made OCA in the effect of Laminating.

5) Bubble Removing Test
After 10 minutes bubble removing process, check the two type of phone screens. Both the Mitsubishi and China Made OCA are in good condition.

6) Bubble Returning Test
After a period of time, check the OCA to see if it has air bubbles in it. The China Made ones sometimes have small air bubbles on both sides of LCD assembly.

7) Repair Test
Separate the LCD display with the machine, then tear up the OCA glue manually to see if it can be removed easily. Mitsubishi OCA can be torn off completely by hand, while China Made OCA can not.

From the test we can draw a general conclusion: Mitsubishi OCA is better than the China Made ones in term of quality.
Article source REWA Technology Blog.

[Solution] iPhone X keeps restarting

The unique design and structure of its motherboard have made any repairs to iPhone X far more difficult than previous models. Especially logic board repairs. For every time. We need to desolder the double layer logic board before formal repair and resolder it back to after the repair was finished. Today we’ll fix iPhone x keep restarting issue by using our newly launched iPhone X motherboard soldering and desoldering rework station. Let’s begin our repair step by step.

For more iPhone X keeps restarting please check the souring full article https://blog.rewatechnology.com/how-to-fix-iphone-x-keeps-restarting/

How much do you know about China made LCD screen

The LCD screen can always be a fragile part compared with other parts within your phone. Once it’s cracked, you have no way but to repair it. With Apple support, you get an Original (OEM) LCD Screen with a high price. With a repair shop, you are most likely to get a China made LCD screen with a much lower price. Yes, because of the lack of iPhone original LCD screens, more and more independent repair shops have turned to China – the world’s factory for replacement parts. Tagged as less expensive than OEM products, China-made LCD screen stands for a potentially worthwhile choice.
Recently REWA has got some exclusive samples of the Tianma-made iPhone 7 LCD screen, did full tests with these samples and found some differences compared to OEM screens in the aspects of appearance, structure and function etc.
In following photos, the white color sample is Tianma-made, while the black sample is OEM.
Dimensions
From the above test data, we can observe that the screen thickness parameter is different. The Tianma-made screen is much higher than OEM screen. The reason given for it is that these two LCD screen structures are different.

Home Button Hole
As for home button hole alignment, there are no differences between OEM screen and Tianma-made screen.

Flex CableAlso affected by the difference of structure, there are some differences between Tianma-made screen flex cable lines and OEM screen flex cable veins.
The left screen is OEM, the right one is Tianma-made.

Structure
Tianma-made iPhone 7 LCD screen features with a conductive layer of ITO, while OEM screen is using an In-cell program. And this also explains the increase of screen thickness.

Tianma-made screen may be relatively falling behind in laminating technology, it proves successful on display and touches function test. The truth is that they do differ from each other, but the Tianma-made screen can also be a good replacement for OEM screen for those who want to cut repairing cost and get an affordable one. Read full article of Tianma-made LCD screen test, please check https://blog.rewatechnology.com/qualified-alternative-rewa-iphone-7-tm-screen/

How much do you know about the iPhone display

The unevenness of quality commonly exists in the mobile phone spare parts market. Many non-original screens are actually sold as original. It seems that the quality standard varies from country to country. Asking specific questions before purchasing from your supplier is half of the battle to get cost-effective products, while not every provider in this industry will give you an honest answer. Therefore, always try to master the rule by yourself. How to tell original LCD from the copy? How to distinguish different grades of quality?
Original iPhone LCD Differs from Copy One in These Ways:
                                                                                                          Original                                     Copy
1. Original LCD Assembly possess tighter and easier PCB connector installation onto the logic board

2&3. Original iPhone screen always has the clearer texture of QR code and flex cable

4. The edges of the backlight unit of original LCD are well sealed

5. All original iPhone LCD assemblies are equipped with Waterproof glass lenses

6. The identification code on backlight unit is usually painted while copies are all the same

7. More accurate screw holes
8. No excessive glue residue between glass and frame
9. Apple logo on QR code and flex cable
10. Precisely soldered backlight unit flex cable
11. Colored ring printed around the front camera hole


Till now it’s far more likely that you will have a very distinct understanding of the original and copy iPhone LCD display screens. Your vendors for iPhone LCD displays are effortless to be found in the Asia area especially in the city of Shenzhen China, but a very limit amount can afford to be frank and honest regarding the different grades of quality of iPhone screens. A majority of mobile phone repair stores and facilities owners mainly make their decision on the basis of price and quality. When encountered with this dilemma, the relative more reliable and practical tactic is to conduct your due diligence before purchasing.
At last, you can go https://blog.rewatechnology.com/unveil-the-secrets-of-iphone-displays/ to see how REWA to test the iPhone display to distinguish the original from copy.

Solution - iPhone 7 Error 4013

Are you ever trapped into the situation that iTunes Error 4013 on iPhone 7/7 Plus? Actually, it is one of the most common problems for iPhone users.  Also, we have sort out and released all the iTunes error codes of iPhone 6/ 6 Plus, as well as all the meaning of iPhone error codes.  iTunes Error 4013 of iPhone 7/7 Plus is usually caused by pseudo soldering or damage of CPU. The problem might also be related to power supply of baseband PMU or NAND flash. Since CPU repair is quite difficult, to start with we can check the power supply of baseband PMU and NAND flash. Let’s check the details.

Tools List Used:
* 4 in 1 Integrated Rework Station
* Electron Microscope
* Digital Multimeter
* PCB holder
* Straight Tweezer
* Paste Flux
* Rosin
* Solder Wick
* PCB Cleaner
* Cutting Nipper
* Anti-static Plastic Pry Bar
* Soft Brush
* Sculpture Knife

90% people who have seen this article about iPhone 7 error 4013 issue also read:

• iPhone 6 Error 9 CPU Repair Without BGA Reball
• iPhone 6 Keeps Restarting? – Fix Error 9 14 40
• iPhone Data Recovery from Dead Motherboard

Fix Samsung S7 edge Won't Turn on - Chip Level Repair Tutorial

“Oh, my Samsung Galaxy S7 Edge won’t turn on!” Yes, we know and understand how annoying it can be when your phone remains frozen at the black screen almost like a dead wood. It is not easy to deal with an unresponsive phone, especially when it does not even turn on no matter how many times you try. However, you are not the only one whose Galaxy S7 edge won’t power on. There are many like you facing a similar fault. Since it is a common problem. You can find and try some basic ways from Google, such as check the power button whether it damage, perform factory reset and etc. Such those basic methods we have mentioned in How to Fix Samsung Galaxy S8 Plus Not Charging and How to fix Samsung Galaxy S8 speaker sound not working. You can take a look.

 

However, there can be various other reasons due to that Samsung Galaxy S7 edge won’t turn on. As for won’t power on accompanied with 50mA-80mA boot current, the first thing we do is to check power supply voltage. If nothing goes wrong, the fault is most likely to be related to CPU. If there is abnormal voltage measured, then check corresponding faulty position on the board. The fault component is finally confirmed as PMIC U7003, our focus today would be to fix this issue. We can fix the issue by replacing with a new PMIC(You can read our another about PMIC Replace Case- iPhone 6 Won’t Turn On Repair – PMIC Grinding and Replacing). Now, follow the instructions given below:

This tutorial offers by REWA Blog, more about the information about fixing Samsung Galaxy S7 Edge won't power on please go to their website.

How to Unlock Any Network SIM Not Supported iPhone

Recently, a news spread widely among iPhone users, especially whose iPhone bears Carrier Lock. The news claims that the locked iPhone can be easily unlocked by using a sim card sticker and a column of numbers. REWA LAB has tried and made a video on YouTube. Let’s check out if the news is real.
Inset a CUCC sim card into an iPhone with American carrier lock. And activate the phone.

The phone is unable to be activated.

Then insert the SIM card below the CUCC SIM card and try to active the phone. The phone could be activated normally, and the phone can make phone call normally.

After activated iPhone with SIM card sticker, spread the dialer board and enter *5005*7672*00#, and select carrier. Then select your iPhone model, which depends on the carrier.

After that, enter *5005*7672*00# again and input ICCID code: 8901410427780604313 and send. With OK appearing on the screen, click ‘Accept’. The phone will be unlocked successfully.

The unlocked iPhone can do OTA upgrade, and change SIM card without SIM card sticker. However, if the iPhone is Erased all content and settings, the phone will back into locked status.
Soon after REWA YouTube relapsed, Apple has fixed this bug, the Carrier locked iPhone could only be used with SIM card stick then. Also, they released the solution for iPhone X Face ID not working after change screen, I guess you guys are interested to take a look.

iPhone X Face ID not working after change screen repair tutorial

Note: This iPhone X Face ID not working after change screen repair tutorial offer by REWA. You can go to their website blog.rewatechnology.com to watch the video.

Recently we got many messages about face ID not available after screen replacement from our clients, which surprised our technicians greatly. Since the screen replacing would not affect face ID function at all according to our practical verification. However, REWA LAB has done some further researches and will share you the detailed analysis and solution for face ID failure caused by damage of flex cable after repair here.
How does face ID work?
First, let’s understand how face ID works. The whole functional area is dubbed the “TrueDepth camera system”, which is made up of flood illuminator, infrared camera, front camera, dot projector, proximity sensor, ambient light sensor, speaker and microphone. Every time you glance at your iPhone X, the flood illuminator detects your face with infrared light and forms an image. Then the dot projector will project out over 30,000 invisible infrared dots over your face to create a 3D map. Last, the infrared camera reads this map and sends the data to neural networks to create a mathematical model of your face. Your iPhone X will check that mathematical model against the one that you’ve set up and stored on your device to see if it’s a match, and if it is, it will unlock your phone.

How do we repair?
According to the description, this iPhone X was dropped once. However, the face ID is in normal status. It fails to work until a replacement of screen assembly. With all the knowledge, we begin our repair.
Power on the phone and it shows “unable to activate Face ID on this iPhone”. So we resort to resetting face ID. Go to Settings > Face ID & Passcode > Reset Face ID. We get the message “Face ID is Not Available, try setting up Face ID later”. Our initial judgment is that the unavailable Face ID might be caused by misoperation in the screen replacing process. Therefore, next thing we do is to check flex cables that are related to Face ID.

Disassemble the phone. And check the Infrared camera and dot projector module under Microscope first. Nothing goes wrong. Then move to the Flood illuminator module on the earpiece speaker assembly. Check the connector and flex cables carefully. Still, nothing goes wrong.

Then remove screws. And detach the earpiece speaker and front sensor assembly from the phone. Be careful not to damage flex cables in the process since the Flood illuminator module is bonded to glass lens with double-sided tape. We can see clearly that the flex cable where locates the Flood illuminator module is fractured at the edge.

Since the Flood illuminator module is an essential part for Face ID circuit, damage of the flex cable can result in not working of it, which can absolutely affect normal working of Face ID. Also, as flex cable repair is difficult, we can solder the Flood illuminator module to a new flex cable. To replace with a new flex cable, we need to separate the earpiece speaker and the ambient light sensor module from the earpiece speaker and front sensor assembly first. Heating with Soldering Iron, the ear speaker was separated successfully. Then, secure the flex cable in the place with High-Temperature Protective Tape for further separating the ambient light sensor module flex cable. Soldering Iron and Hot Air Gun are required to remove this flex cable. Once done, remove excess tins on the flex cable with Soldering Iron and clean with PCB Cleaner.
Now the fractured flex cable is separated completely. Next thing we do is to replace with a new flex cable. Remove the Flood illuminator module on the flex cable first. Prepare a new flex cable. Apply some Paste Flux to the bonding pad. Align the Flood illuminator module in place with the new flex cable. Be careful with the direction. Then solder with Hot Air Gun. Remove residual glue on the module afterward.

The repair part is almost over right the moment. Next thing we need to do is to re-solder the ambient light sensor module and earpiece speaker. However, the soldering of the ambient light sensor is a most difficult part for this repair. Whatever, let’s do it. Apply some Paste Flux to the bonding pad of ambient light sensor module. Then apply tins to the bonding pad with Soldering Iron. Clean with PCB Cleaner. Apply some Paste Flux to the bonding pad again. Get the detached ambient light sensor module flex cable in position. Secure the flex cable with one specific position soldered by Soldering Iron with curved nozzle first. Then use Soldering Iron with cutter nozzle to complete the remaining soldering process. Clean with PCB Cleaner afterwards. Now we need to solder the earpiece speaker back to flex cable.

It’s time to get the earpiece speaker and front sensor assembly assembled to the display assembly. Re-assemble the phone and test. Press power button to power on. Go to Settings > Face ID & Passcode > Set up Face ID. Face ID can be set up successfully. Press the power button to lock the screen. Press the power button again. The screen lights up. Glance at the iPhone X. The screen can be unlocked automatically. Fault cleared.