Tag: iPhone screen

iPhone 8 Screen VS iPhone 7 Screen Hands On Comparison

Our previous blog iPhone 8 Plus Screen VS 7 Plus Screen Hands On Comparison has presented detailed comparison on iPhone 7 Plus screen and iPhone 8 Plus screen. Some might be wondering what’s the difference between iPhone 7 Screen and iPhone 8 Screen? Well, REWA LAB at your service! Follow REWA’s presentation below!

iPhone 8 Screen VS iPhone 7 Screen

Similarities

Run Cosmetic inspection, no obvious differences on the glass lens.

The two screens come with the same dimension.

The two screens feature with the same flex cable structure.

Differences

iPhone 8 Screen comes with metal buckle on top of the bezel yet with no gap between Ambient sensor hole and Proximity sensor hole. iPhone 7 Screen comes with the plastic buckle on top of the bezel yet with a gap between Ambient sensor hole and Proximity sensor hole.

iPhone 8 Screen comes with black plastic screw holder on the bottom. While iPhone 7 Screen comes with metal screw holder on the bottom.

There is slight difference on the metal part of the bezel (right side) while no obvious difference on the metal part of the bezel (left side).

Primary Function Test

Apply iPhone 8 Screen to iPhone 7, buckle on top of the bezel cannot match. iPhone 8 Screen performs with normal display function on iPhone 7, yet with no touch function and touch ID.

Conclusion

The new iPhone 8 Screen has almost the same cosmetic appearance and structure as iPhone 7 Screen yet with some obvious differences on the front bezel.

Stay in the loop for more breaking news of theiPhoneiPhone screen supply chain or read iPhone X OLED Screen Total Teardown Analysis.

September 27, 2017
iPhone LCD Screen Sampling Test

To ensure the highest quality of iPhone screens, REWA Technology operates with an integrated quality control system, applying for professional quality assurance from purchase to delivery, and strict testing procedures. REWA iPhone LCD Screen Sampling Test, composed of the following 5 strict testing procedures, ensures qualified suppliers and high-quality products.

REWA LAB iPhone LCD Screen Sampling Test

Cosmetic Inspection

Check whether the surface of glass lens damaged or off paint, etc.

Check whether the front bezel debonding, damaged, screw hole blocked, etc.

Check whether the flex cable is broken or damaged.

Check backlight adhesion normal or not.

Check hydrophobic effect with water, alcohol, and N-hexane.

Function & Display

Test touch function by pulling up and down, switching page, moving icons.

Test 3D Touch function and sensitivity.

Check pure color screen normal or not.

Check whether the screen turns black under polarizer.

Test Color Coordinates & Brightness with Color Analyzer CA310.

Structure Test

Measure thickness, width and length.

Check whether LCD metal plate well matched or screw hole well aligned.

Check screen fitness with iPhone housing after installation.

Check whether function normal or not after installation.

Check whether light leaked or backlight conflicted with LCD

Run Touch ID function test.

Aging Test

Run Dynamic test (condition: +45℃; playing video for 2Hrs ), check whether display normal or not. After that, run function test again.

Run Static Cycle test (condition: -20℃/2Hrs, +55℃55%RH/2Hrs, +55℃/4Hrs), check whether display normal or not.

Once finished, check backlight adhesion and run another round of function test.

Vibration Test

Packaging the LCD assembly with a blister box. Then run Electromagnetic Vibration Test (Amplitude: 2mm, Frequency: 50HZ, Time:1H).

Once finished, check backlight adhesion and run another round of function test.

Test Report

Those passed all tests would be certified by the test report issued by REWA LAB.

You can check our iPhone X OLED Screen Total Teardown Analysis video.

September 21, 2017
iPhone Frozen Screen Issue – Logic Board Repair Solution

Some users complained about the iPhone frozen issue of their iPhone 7 after dropped.

Even reinstallation couldn’t help with the iPhone frozen problem once and for all.

The malfunction was caused by the iPhone 7 production process, which could be fixed by maintaining audio circuits.

REWA offers a new iPhone frozen solution regarding logic board repair!

Fix The iPhone Frozen Screen Issue With Logic board Repair Solution

Power on, the screen is stuck off and power button responses slowly.

Disassemble the phone, detach the display assembly. Replace with a new display assembly.

Turn on the phone and test. The screen is still stuck off.

Enter into record mode, the record icon is in nonfunction state.

Screen replacing doesn’t help on the stuck issue, we can tell that there is a problem with the audio circuit. Move on to logic board repairing.

Take out the logic board and tear off the shield sticker.

Apply some BGA paste flux around the audio IC and blow it with hot air gun at 300 degrees.

Then take down the audio IC.

Dip some rosin with soldering iron to clean the tins.

Then dip some rosin with Goot wick for secondary cleaning. After that, clean again with PCB cleaner.

Test resistance value of pin C12 (U3101 audio IC). The resistance value is swinging.

Roll out the maintenance drawing for reference.

Locate the signal of pin C12: 12S-AP-TO-CODEC-MCLK. The signal was connected with CPU via resistor R1103.

Scrape the insulation varnish off the copper wire connecting pin C12 and resistor R1103. Solder tins and then solder the 0.02mm copper wire.

Apply some UV curable solder mast to the soldered copper wire and put the logic board under the UV dryer lamp for 15 minutes.

Reball the audio IC with BGA reballing stencil.

Apply some BGA paste flux to the bonding pad.

Then align the audio IC to the right place and blow it with a hot air gun at 280 degrees.

Once the logic board is cooling enough, clean it with PCB cleaner.

Assemble the phone and test.

Touch function and record function back to normal.

For more details on iPhone Frozen Screen Repair guide.

September 13, 2017
Cheaper or Poorer? An Overview of Chinese iPhone 6 Screens

There is both OEM iPhone LCD screen and China Made ones by far on the market. The latter type of display mainly manufactured by two full-fledged LCD panel vendors which are JDF and LT. Let’s have a look at the two different replacement LCD screens from the aspect of Appearance and Function after our stress testing.

Appearance

1) Size, Thickness and Weight

By measuring up with the micrometer, we can easily find that JDF made screen is thicker than the OEM one and LT because a plastic layer has been added to the phone glass lens. Below is the specific data with regard to the LCD assembly weight, LCD assembly thickness, home button size and cell phone front glass thickness.

Manufacturer OEM JDF LT Weight of the whole screen 31.40g±0.02 35.10g±0.02 34.50g±0.02 Home button size 10.7mm±0.02 10.84mm±0.04 10.72mm±0.04 Thickness of the whole screen 2mm±0.02 2.39mm±0.04 2.37mm±0.04 Thickness of the glass lens 0.8mm±0.04 0.67mm±0.04 (plastic layer 0.19) 0.53mm±0.04

2) Flex Cable

OEM, JDF and LT LCD display and digitizer touch screen flex cables are different in length and textures.

OEM  JDF  LT

3) LCD’s Appearance

When leaning at 15 degrees, you’ll see digitizer touch screen textures both on the LT and JDF LCDs. OEM: None  JDF: Strip  LT: diagonal lines and light spot.

OEM  JDF   LT

4) Structure

Compared with OEM LCD screen, both JDF and LT screens use G+G touch screen display technology. The only difference is that JDF’s touch screen digitizer stick together with LCD (similar to iPhone 4/4s), While the LT is coherent with outer glass lens Below is the specification of their different manufacturing techniques.

LT  JDF Manufacturer OEM JDF LT structure (technique) in-cell G+G: Glass+(touch+LCD) G+G: (Glass+touch)+LCD

Function

1) 3-Proofs

The OEM screen has the characteristics of waterproof, alcohol-proof and n-hexane-proof, while JDF and LT do not.

OEM  JDF  LT

2) Installation

* JDF and LT come with unconformable LCD supporting bezel frame. * JFD and LT’s screen cannot fit together perfectly in the installation. There is a gap between the LCD touch screen assembly and the body. LT is more serious than JDF in this problem. * For some JDF screens, if you first connect the LCD flex cable to the logic board then try to power on the phone, the screen can not light properly; if you start up the phone first then connect the flex ribbon cable, it can display normally.

3) Display

Clear color difference. The LCD display color of the JDF, LT and OEM LCD differs greatly. For LT and JDF, you can see obvious color changes from different angles. While the OEM screen always keeps the same color.

* Some JDF and LT screens have issues of backlight leakage and shadow. * Installed with the OEM Metal LCD Back Plate, some of the JDF’s screens will have a large area of backlight leakage in the LCD display area, because of the asymmetrical bezel frame and the LCD thickness. 4) Touch Functionality Both JDF and LT screens have possible issues of touch insensitive and screen splash. At the aging test, some screens will be more serious when the temperature reaches 35℃ above.

Through a series of testing and analysis, REWA suggests that the new China-made iPhone 6 screens are unstable and can not up to our inspection standard at present . We will keep watching and testing until these problems are properly improved. If you are looking for cost-effective screens, please contact us and any concerns or questions will be warmly welcome. Want to order our products? Please contact us:

PRE-SALES Skype: rewatech

Email: service@rewa.tech

AFTER-SALES Skype: support-rewatech

Email: support@rewatechnology.com

July 10, 2016
Causes & Solutions for Static Electricity on LCD Screen

In regard to some iPhone 5 screen units, a few fuzzy vertical or grid lines appearing on the LCD screen, which usually thought to be caused by static electricity.

In some special cases, static electricity may even cause following problems: gray screen when tearing protective film, unresponsive screen , unstable touch functionality etc.

Generally, only iPhone 5 series LCD Assembly has the static electricity problem, while iPhone 6 series LCDs are free from this trouble due to their improved material and technology.

Causes of screen static electricity

1. Silver Conductive Paste

2. Aside from the silver conductive paste problem, quality and material of POL film is also a big cause.

A. Screen without silver conductive paste

B. Misoperation in injecting silver conductive paste

3. Cracking Corner

4. High temperature. New produced iPhone 5 series screens perform poor in electron conductivity due to the high temperature, which causes static screen. Solutions

1. If you make sure it is caused by quality and material of POL film, we suggest you replace it with a better POL film.

2. For those screens without silver conductive paste or the mishandled, it needs to be injected or re-injected qualified silver conductive paste.

3. There are two solutions for the screen with cracking corners: a. Inject the silver conductive paste to the gap junction between POL film and touch screen digitizer flex cable;

b. Connect the bottom of touch screen flex and POL film with conductive tape. Solution A is recommended because it is easier to handle.

4. As regards static electricity caused by tearing film or high temperature, please confirm whether it has been injected with silver conductive paste first, If yes, charge it or just leave it to place for a certain period of time.

Tips: A. More attention should be paid at iPhone 5 series Toshiba LCD, the unique structure makes it easier to be mishandled. Avoid applying any silver conductive paste on the gap between the three lines.

B. How to distinguish LCD manufacturer? The texture of control circuit on the upside of the glass is different.

Want to order our products? Please go to our online store shop.rewa.tech to get or contact us:

PRE-SALES Skype: rewatech

Email: service@rewa.tech

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Email: support@rewatechnology.com

June 28, 2016
Which is the most cost-effective China made iPhone 6 LCD?

LT(IVO)

There are several display panel manufacturers in mainland China of which JDF(BOE) and TM(Tianma) stand out noticeably. JDF has gradually transformed its 6th production line into small-to-medium-size displays since 2014 and now JDF proceeds this plan and concentrates production capacity in this field in an all-around way.

As a matter of fact, TM(Tianma) has already transformed its display size and capacity altogether in late 2013 in prior of JDF(BOE), focusing on small-to-medium-size displays.

In addition to this, though SC which was vigorously supported by Foxconn had been performing mass production for LTPS, TFT, LCD displays at the beginning of 2012, did not make a great progress for the reason that SC failed to neither win over the Apple iPhone orders and nor get authorization in CG Si and IGZO technology of Sharp.

But do you know which iPhone 6 LCD made by these three display penal manufacturers is more cost-effective? Let’s go on with this article and sort things out. Not too long ago, REWA has analyzed the JDF(BOE) and LT(IVO) China made iPhone 6 LCDs in some ways. After several months’ development, how is the situation now? We have tested 3 mainstream China-made iPhone 6 LCDs by JDF(BOE ), TM(Tianma) and SC from aspects of “Appearance” and “Function” in order to make a comparison with OEM ones and give us clarity of thought.

Appearance

1) Glass Lens

There is no difference between JDF, TM and SC LCDs and OEM ones in appearance.

2) Button Hole Alignment

Through visual inspection we can hardly tell obvious differences among OEM, JDF, TM and SC LCDs.

3) Bezel

None of these three kinds of LCDs have deformations, breakages, looseness or degumming on front LCD Supporting Bezel Frames.

The front bezels of different type match LCD Back Metal Plate very well, it is still hard to tell differences between JDF, TM, SC and OEM ones.

In terms of bezel matching with LCD and touch screen assembly, all these three China made LCDs can be matched perfectly.

After installed in the mobile devices, it’s much easy for us to find that all these three China made LCDs have a small gap between the LCD and device body, especially SC.

4) Flex Cable

It can be observed visually that LCD Display and Touchscreen digitizer flex cable made by JDF, TM and SC are different in texture. 5) Structure Generally speaking, there are two kinds of mainstream cell phone display constructions of formation, “G+G” and “In-cell”.

Compared with the In-cell structure of OEM LCD, JDF, TM and SC which use G+G touch screen display technology thus cause their overall thickness greater than the OEM ones.

Function

1) Touch

Testing Touch screen digitizer by moving the app icon in all directions including swiping from the edge of the screen, JDF, TM and SC display have no problems with touch function.

2) Display

Testing LCD display in the pure color of gray, white and black, a part of JDF, TM and SC LCDs have somewhat degree problems of backlight leakage, but it does not affect the normal use and can be ignored in a certain sense. Note: The severity of this problem in the actual situation is a lot more slight than the captured pictures above.

3) Color Difference

By comparison, the visual colors of JDF, TM and SC made display differ from the OEM ones.

4) Aging Test

After playing video for 72 hours, JDF, TM, SC have no obvious differences with the OEM ones.

Conclusion

From a series of tests we can find there are only a few differences between OEM display and China made LCDs. In terms of quality, JDF & TM are better than SC. For Price, JDF is more favorable than TM. Therefore, on the market condition that OEM LCDs being out of stock, JDF LCD is the most cost-effective choice for you. Want to order our products? Please contact us: PRE-SALES Skype: rewatech Email: service@rewa.tech AFTER-SALES Skype: support-rewatech Email: support@rewatechnology.com

June 18, 2016
Unveil the Secrets of iPhone Displays | REWA Guide

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? REWA helps you unveil the secrets of iPhone displays.

Original iPhone LCD Differs from Copy One in These Ways:

1. Original LCD Assembly possess tighter and easier PCB connector installation onto the logic board

2&3. Original iPhone screen always has a 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

How REWA Tests:

1. Cosmetic Inspection

Ear Speaker mesh& camera/sensor holder& flex foam are pre-installed Free of dust/dot, scratch, color difference etc. on the glass lens No damage to the PCB connector or flex cable Stable flawless frame

2. Touch Testing by Moving in All Directions

3. LCD Display Testing on Pure Gray, White and Black Color

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.

Have you managed to master the rule of the cell phone spare parts aftermarket industry by yourself? If you still have any questions, please feel free to contact us or leave messages on our website.

Want to order our products? Please go to shop.rewa.tech to get. Each product has shown the prices, shipping fees as well. Any questions please contact service@rewa.tech .

June 2, 2016