Recently, I've noticed that many fog screens are causing great anxiety, so based on my personal experience testing the screen, I've summarized some methods. If all are approved, 99% of the screen can be guaranteed to be original.
Personally, I bought ten iPhones in about half a yearMobile phones(One volume contains 17 parts, five partsaiR, one 17pro, two 17pm and one 16pm) also specifically visited offline phone stores to check out several domestic screens priced around 800-1200, Comparing the original screens of several phones to summarize my experience. If there are any mistakes, I welcome your advice

Tools: 365nm wick ultraviolet lamp, white light/high-intensity flashlight.
For device inspection, please peel off the screen protector; applying the screen protector is just for fun

Let's get to the main point

(1) Check the position of the Dynamic Island. Turn on a white light to see if the black edges on the island are even. If there are some small serrations, it may be normal and likely a workmanship defect, so there's no need to panic. If the black border shows image two, then it might not be the original screen. The black edges on the original screen may have some jagged edges, but they are definitely even. If the black edges differ significantly, it is a preliminary judgment that it may not be the original screen. Screen background colors may vary depending on ambient light; this is for reference only, it does not need to be a necessary condition.
Domestic screens may also have even black bezels; if the black edges are uneven, you can preliminarily judge that they are low-end screens. If the first part is fine, let's move on to the next step

(2) In dim ambient lighting, when looking at Dynamic Island under a purple light, the pill area appears orange, which is quite necessary. I compared three domestic screens at different price points in offline phone stores, and none of them matched. Conversely, the original screen will always appear orange. Whether it's the 17 series or the 16 series,
Second, look at the front camera. Under the ultraviolet light, there's a fluorescent ring, and if you look closely, you can see the outer ringIf the ambient light is too bright, it may not be visible; it is recommended to observe in a dimly lit environment.
This is very necessary. Most domestic screens don't meet this requirement, but the original screen always delivers this effect. No exceptions.

Here's the key point!!

(3) This is crucial! Does the screen have refracted light, and does the Dynamic Island have waterfall light? Because domestic screens, so-called fog screens, or screens that override the cover panel have light transmittance that is far inferior to the original screen. You can use a high-intensity flashlight or phone flashlight to shine directly and find the right angle. The original screen will definitely have the refraction effect shown in the picture and the waterfall effect at the Dynamic Island, which is very obvious and also noticeable under sunlight。 Domestic fog screens and cover panels have poor light transmission, lacking this effect. Be sure to peel off the membrane!! Tempered glass has a significant impact!!

Summary———— If your Guozi screen meets these three criteria, it is highly likely to be considered an original screen. On the other hand, if the screen doesn't match, especially the third point, it's very likely not the original screen.

The original purpose of this post is to help fellow users who buy second-hand iPhones identify whether it's the original screen. The fear isn't domestic screens, but the price of original screens being bought from domestic onesThere are also some videos online about buying a bomb device under TB/PDD's 100 Billion Subsidy. Personally, I think the 10 Billion Subsidy is quite stable and the price is reasonable. Cool friends can buy it with confidence.

As everyone knows, second-hand Apple is in deep trouble, and recently the fog screen has appeared, making CoolCool users afraid to touch second-hand Apple anymore. As for whether it's an original screen, you can judge by this post; other parts require careful inspection of the device.

If any cool friends are unsure, feel free to post in the comments. I haven't been working lately and am online intensively, so I can help identify (results are for reference only).
Finally, I wish all cool friends never encounter bomb planes and have a great time during the May Day holiday!

If this helps you, please give it a like

At the end, I attached a handmade intangible cultural heritage velvet flower made by my partner, and helped her with a small advertisement. If any brother likes it, feel free to message me. All kinds of styles can be customized. Please forgive any disturbance