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.