Nowadays, projectors are becoming more and more popular. For those who have a long grass, they can always see something that is easy to grow. In 2012, he DIY a box projector, I remember that at the beginning of the cost of 1,500 or so, the effect is of course predictable, but you must see all black environment.
Later saw the protagonist: Acer K300: micro-projection, LED light source, DLP program, 500 lumens ... ... The most important is the price as long as 2500 +! ! ! ! and so. . . In less than two days, I was told to buy a projector. Remember that the projector +XBOX's Hapi was not too embarrassing at the weekend. Since then, a lot of grass has been planted in my heart.
Three years passed quickly, during which time the house was moved twice, from +XBOX to + Baidu set-top box to achieve projection TV. After a long absence of use, there was a malfunction after it was turned on, and the projection was dark. After 10 seconds, the LAMP was faulted and shut down automatically. He also took Acer projector sales, said that the main control board is broken need to be replaced, the price of 1200 half the price, not to mention already spent more than 3 years, and my heart is also self-comfort.
The cadaver's ash is not as good as that of a dead horse. He strongly urges the company to take care of it, so there is a video and audio equipment in the office.
================================================== ================================================
First of all, these photos were taken after the completion of the repairs, so it is not possible to display faulty pictures.
Problem Analysis: LAMP fault query mother learned that: power, light source, optical sensor damage may occur.
First, disassemble
positive
Rear demolition
Remove the 4 screws from the circle and push the white back plate in the direction of the arrow to get it.
The frontal dismantling requires boldness. First, the buckles at the bottom must be removed. After the backplane is unloaded, it can be seen. Then back to the front, there is a rocker on the four sides slowly tilted up, there is no rocker can only use a nail file, all around the end of hard to pull up from the front to open
Second, diagnosisForget to take a complete picture after opening, go straight to the diagnostic process.
1, power troubleshooting
From the onboard information, we can see that the power board outputs two power supplies, one for 5V for the main control board and one for 12.5V for the light source driver board. It should be noted that the 12.5V output will only be output when there is a load. This is because this problem has cost me a half day of troubleshooting.
2, sensor circuit maintenance
The following is a light intensity sensor, connected to the main control board and boot, still 10 seconds after the error and automatically shut down. Detecting the working condition of the sensor during the working process found no voltage or signal. The test power OK, but the sensor power circuit has no voltage, suspected of welding. After some of the circuits were tin-filled, the sensors were working properly.
At this point the boot is working properly, but the screen is still dark, suspect light source structure is abnormal, remove the light source, imaging part of the structure:
Don’t mention that dust-free environment. It’s impossible for me and other small people.
First remove the focusing lens, and then remove the green light, red light, blue light and its heat dissipation structure.
Remove the upper cover to see the internal optical structure
The DLP system structure diagram that Du Damien finds
Generally, the white light source changes the color of the light source through the color wheel. The K33O directly adopts the three primary colors of red, yellow, and blue to process, not only reducing the volume of the light source, but also avoiding other problems caused by the failure of the color wheel.
When you come back to the topic, you can see that there is something obvious
Taken out, Nima is the plastic's key optic with plastic. . . The high temperature environment itself is not bad? Acer, can you make a pit?
This device has two front and back sides. The front piece of paste is removed. The back piece is also slightly injured. However, it can be used. Try to remove this directly. Cast all but the center point, and the other places are red, so you can use it. .
Now that the optical components have been removed, let's continue to take a look at the DLP's imaging core, remove the heat sink, and see a layer of thermal pad underneath:
Remove the adapter plate
Take out the reflection original, this is the image reflection original.
In accordance with the order of dismantling and reloading, the test OK, the brightness is restored, as for the brightness, 500 lumens in the environment is indeed see the light is very tired, the lunch break when the black light bonfire just right
================================================== ==============================================
Summary: It took more than 20 hours from dismantling to complete repair. It took a week and a half to apportion to lunch break and free time. Although the middle hit a severe wall, the amount of electricity saved by the high voltage part of the power supply flashed a bit. When accidentally broken the power output; adapter plug because of multiple plug breaks and new ... In general, learned a lot, I hope this article can provide a certain idea of ​​the value of the projector fault friends
Phenolic Paper Sheet Customized Parts
Custom manufacturer of CNC fabricated wood parts for industrial purposes. Available in a variety of specifications. Services include bending, forming, tube bending, waterjet cutting, machining, welding, weldments, and machine building. Can accommodate a wide variety of fabrications, including large or small parts and assemblies. Assembly, prototype, finishing, design, and engineering services are also offered.
Phenolic Paper Sheet,Phenolic Machined Parts,Phenolic Paper Machined,Phenolic Paper Sheet Machined Parts
Yingkou Dongyuan Electrical Insulation Board Co.,Ltd , https://www.dy-insulation.com