Alas, I passed by the mall two days ago and saw a large LED screen. Half of my face was dark and I was still holding on, as if I had vitiligo. This reminds me of something - last year there was a hot pot restaurant owner who had a flash of the display screen as if it was light balls in the disco hall. He had to make do with it for half a year, and finally repaired it three times and spent enough money to buy a new one. Today we will talk about when to "sent to death" the LED screen.

1. These symptoms require "major surgery"

Remember three death signals first:

1. ​​Large area black blocks​: Like the map lacks provinces, more than 30% of the areas are not bright (especially large-pitch screens above P10)
2. ​​The color is out of control​: Play white turns pink, green turns yellow, and even color-study software can't save it
3. ​​Power burnt smell​: When you smell the smell of burnt plastic, you will quickly cut off the power. This is the last warning of the aging of the line.

Last month, I helped my friend watch the stage screen that I used for five years. I found that the power module was carbonized. This is like having late stages of cancer, and repairing is even more dangerous.

2. Repair or replace it? Look at this account

Take common P4 indoor screens as examples:

There is a line formula:​The repair fee exceeds 40% of the new product price and should be replaced​. Just like the screen of a mobile phone is broken, and the money to change the screen is enough to buy a second phone, so why can I repair it?

3. These parts must be replaced in full

1. ​Control system motherboard​: It is equivalent to a mobile phone CPU, and the discontinued model cannot find accessories at all
2. ​​Power power distribution cabinet​: Old-fashioned non-standard interfaces are now eliminated
3. ​Steel structure frame​: Rust and deformation exceeds 2 mm, have to be remade

Last year, the curved screen of a supermarket was suspended from production of the 2016 receiving card because the manufacturer forced to customize the accessories for three months, and the shipping fee was even more expensive than the parts. At this time, it is better to change the whole set.

4. Special scenarios must be upgraded

1. ​​Outdoor screen has been used for 5 years​​: It was sun and rainy, and the glue strips were aged and turned into powder
2. ​​Sports Stadium Screen​: Now 3840Hz high brushing is required, and the slow motion of old devices is all about dragging shadows
3. ​Transparent window screen​: The new 86% light transmittance is more than twice as clear as the old model

There is a cold knowledge: Now the mainstream brightness standard mentions 5,500 lumens outdoors. Those old screens that are less than 4,000 lumens can’t be seen clearly during the day. Can you keep them as blackboards?

5. Five-step method of self-detection

1. ​​Pattack Test​​: Tap the border lightly (don’t use too much force!), snowflake patterns indicate poor contact
2. ​Temperature detection​: Touch the power box by hand, stop using it after exceeding 60℃
3. ​Color level diagram test​: Play 256-level grayscale images, if you miss level 5 or above, it will be useless
4. ​Pixel detection​: Under the solid color screen, more than 5% of the lamp beads have to change their color
5. ​​Aging test​: After working for 8 hours, the screen will be eliminated directly

I remember there was a tough trick: use your phone to shoot the screen in slow motion. The black scanning line appears, which means that the refresh rate is less than 1920Hz. This kind of screen is not even used in a roadside barber shop now.

Editor's opinion

Changing the display is like throwing old clothes - hesitation is the most expensive. There is a strange phenomenon in the industry now: the smaller the factory, the more you like to persuade customers to repair it. Why? Because they don’t have their own production lines at all, they make money by reselling accessories. If I ask me, don’t hesitate when encountering three situations: it has affected business, has poses safety risks, and has repaired more than three times. Nowadays, regular manufacturers all come with a five-year warranty, and some can even discount the old screen by 30%. This account can be calculated no matter how you calculate it. Finally, I would like to remind you: Don’t unbox the box yourself! Last year, someone took off the module and cleaned the dust, but the driver IC was electrostatically burned, and it made a minor problem a major repair.

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