Manh Tuan 26/01/16 149 comments 
In the upcoming Tet holiday, the demand for smartphones is increasing. Especially used machines or portable goods. Because the price of this item is quite cheap compared to the brand new one. So many people are also very concerned about the quality of these phones.
They don’t know if the thing I’m about to buy is of the right quality, has it been “boiled” or not…? Here are a few tips for you to check if your iPhone has had a screen replacement, and whether the screen is factory standard or brand new.
What is “Zin screen” and “Lot screen”? The zin screen is a genuine screen from the Apple manufacturer, with extremely good quality and the colors displayed on the screen are more beautiful than the batch – not provided by Apple. Of course, genuine products with guaranteed quality will have a higher price than fake ones in the market.
The batch screen is a fake screen, with a lower price than the zin screen, with many types of screens with medium to high quality. However, no matter how high-end the owner, the batch screen cannot achieve the same high quality as the zin screen.
The screen is the easiest thing to remove and replace on an iPhone
1. Check the outside appearance
First, drill up the power, look closely around the edge, where the screen and case contact. If it is a zin screen and has not been removed for replacement, these edges are always sealed, not exposed because the quality of Apple’s processing is extremely good.
In the batch screen, or the screen that has been repaired is the type that is not processed as well as the company, so when assembled, it will be warped, causing open edges, unevenness between the contact parts. This part, you just need to pay close attention to be able to recognize your face right away.
The batch screen is often exposed between the contact areas when assembled
Going to the screen, there are many points to note. With a genuine zin screen processed by Apple with high-quality materials, if you drop water on the surface of the water droplet, it will gather in one point. As for the batch screen, because this is a poor quality product, the material will not be good. When dripping water on the screen, the drop will immediately spread, not gather in one point.
You can also check with adhesive tape. Please try to paste a layer on the screen, when peeled off, if removed smoothly and easily, it is a zin screen. When it is difficult to peel off and the screen still has some glue from the tape, it is definitely a poor quality product.
The left illustration is the batch screen, the right one is the zin screen
On the other hand, with zin screen will be thin. When placed horizontally, it will not be too high compared to the border. And the screen that has been replaced or re-pressed the glass will protrude higher when pressed with a soft, creaky feeling, not as solid as a zin screen.
When flicking your finger all over the screen, the screen will have a cloudy and even sound, and when flicking your finger on the screen, the sound will be uneven; high and low sound because the glue layer is covered in thick and thin places. This is also difficult to recognize if you are inexperienced.
With a white zin screen, the color will be opaque porcelain white, and with a batch screen, the screen tends to be quite yellow. As for the Residence key of the device, if the device has replaced the poor quality screen, the Residence key is also soft down, when swiping or pressing it will feel quite tight, not as smooth as the unrepaired zin screen. .
2. Check touch, sensor, dead spot, etc.
Touch test: First of all, while in the main screen interface. Press and hold any icon and move it evenly across the screen to test the touch of the screen, make sure that every point on the touch screen is normal. If in the process of moving this icon slips off, it is because there is a place on the screen that is paralyzed.
Then, open the messaging application, try typing on that keyboard, type quickly to see if the words appear almost or not, the screen will not be sensitive enough to receive all the words when you type quickly. Perform multi-touch operations on the screen such as zooming in and out with 2 fingers, deleting 3 applications running in the background with 3 fingers at the same time to see if the multi-touch operation on the screen is good.
Try it a few times to make sure the touch screen is working properly. Carefully check the edge of the screen and the corners of the screen – where the screen is most susceptible to paralysis.
Long press and move any icon to test the touch
Then increase the screen brightness as much as possible. Look closely at the color of the screen. With a zin screen will give good colors, no color fading and viewing angles will be very good, when tilting the screen with a large angle, you can still see aspects of the image.
Also, look for a dark corner and look closely at the part of the screen that is in contact with the frame. Some machines when replacing the batch screen will not be snug and cause light leakage at the edge.
An iPhone with a light leak at the edge of the screen
Check dead spot, open light: You can check for dead spots on your iPhone by going online and downloading color photos and viewing them in full screen mode. Preferably 2 colors white, black and if careful, download 3 more basic colors blue, yellow and red to check color rendering.
First of all, see in 2 colors white and black. If there is a dead point, the screen will display an unusual color point, which may be very small, so we need to look carefully. And while to display black, pay close attention to the part of the screen that is about to be bordered to see if the screen is exposed to light or not. Screens that have been pressed or laminated are often exposed to light more or less depending on the skill of the worker and the quality of the screen’s processing.
Next, open the view in 3 basic colors to check the color display, see if they are color deviation from reality, tilt the screen to see if the display is good, etc. A good and standard screen is the color. The color will be even, without smearing or having unusual bruises on the surrounding color.
Screen is bright and bruised
Light sensor test: Make a call and cover the light sensor above the speaker with your hand. If the device turns off the screen, the light sensor of the device is still normal. Please try again and again a few times to make sure the sensor is still working properly and stable. If you have a problem, don’t buy this phone
Those are just some tips to distinguish the screen. But best, you should find a place that is really reputable and can be trusted, along with a great warranty. Some contacts listed in the warranty card are “warranty for the whole machine” but do not guarantee the power and screen. Be a savvy consumer in choosing the products you will use.
You can refer to used genuine goods at bloghong.com here.
See more:
- A guide to buying used smartphones for non-experts
- Shopping for old scientific goods: ‘On-line flea market’ or ‘genuine cheap’?
- How to use Magicut on iPhone with many sizzling video editing features
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