Troubleshooting method for projector brightness display

Troubleshooting method for projector brightness display

Fault 1, the screen is dim

When encountering this phenomenon, first check if the ambient light is strong. If the ambient light is too strong, it will weaken the effective light source energy projected by the projector onto the screen, causing the screen to look dim; once the ambient light is found to be strong At that time, you can turn off some light sources, or use curtains to block the light from outside to make the ambient light dim as much as possible. In addition, in order to prevent the reflected light generated by the surface of the projection environment such as walls, floors or ceilings from "interfering" with the projection screen, you also need to ensure the environment in which the projector is located, and use the floor, screen, walls, and curtains with relatively rough surfaces as much as possible. Wait. Secondly, check if the distance between the projector and the screen is too long. Once the position between the screen and the projector is far apart, the energy of the light source projected from the projector will be lost in long-distance air transmission. The effective light source energy received on the screen will be less, then the screen will look dim light; for this reason, in the process of demonstration, the distance between the screen and the projector must be adjusted to ensure the projector. The projected light source energy is absorbed as much as possible by the screen. Third, check if the projector is working at a higher output resolution. If not, try to set the projector's output resolution higher because the resolution is the same at the same projection brightness. The high projection picture looks naturally clearer and brighter than the lower resolution projection.

Fourth, check if the area projected on the screen by the projector is large. In general, when the projected light of equal energy is projected onto a smaller screen, the screen light tends to be brighter, and when projected onto a larger screen, the screen light is more faint, because In the case where the energy of the projection light source is constant, the light source energy obtained by the large-sized projection screen on the unit area is generally small, and the brightness effect per unit area is worse. Therefore, once you find that the screen size is large, you may wish to adjust the focal length and try to control the projected screen area to an appropriate value. The fifth is to confirm whether the projection bulb has been used for a long time. If the time is too long, it is mostly that the projection bulb has aged. If you are familiar with the projector, you can open the projector's outer casing and turn the threaded lens up. If the surface of the bulb is gray or gray, it indicates that the projection bulb is aging. The only way to do this is to replace the old one and buy a new one that meets the requirements of the projector. This will eliminate the dim light on the screen.

Fault 2, uneven screen brightness

In the process of projection presentation, it is also possible to find different positions on the screen, the brightness effect is also different, and even various strange shapes appear on the screen. When encountering these malfunctions, we need to be based on specific phenomena. Take a different approach. For example, if there are color traces on the four sides of the projection screen, most of them are too close between the threaded lens inside the projector and the convex lens on the top of the projection bulb. At this time, you only need to open the projector casing and then the projection bulb. The position of the lamp holder is fine-tuned until the color traces on the four sides of the screen are eliminated.

If an elliptical shaped light sphere appears in the center of the projection screen, most of the threaded lens inside the projector is reversed. At this time, you only need to turn the threaded lens over and reinstall it correctly.

If there is a serious speckle on the screen, most of the surface of the optical components inside the projector has accumulated a lot of dust. For example, if there is dust on the lens of the projector or on the internal threaded lens and the convex lens, then the dust will be present. It will be magnified by the projector, and the screen will look speckled. To eliminate this phenomenon, you must clean the projector in time. When cleaning optical components such as projector lenses, threaded lenses, and convex lenses, be sure to use professional lens paper to remove dust, and when wiping dust, try to follow the order of the rear edge area of ​​the center area. In addition, when using the projector, cover the lens cover of the projector in time to avoid more and more dust on the surface of the projector lens; and everyone should also pay attention to if the dust can be seen in the projection environment. If you are flying, please do not open the projector for a working demonstration.

If a black shadow with a similar geometry is seen in the center of the projection screen, most of the projection lens at the top of the projection bulb is slightly tilted up, causing the edge of the convex lens to block part of the projected light. To avoid this, simply open the projector's outer casing and turn the convex lens on the top of the bulb down slightly until it is parallel to the position of the projection bulb.

Fault 3, the light focus is abnormal

Under normal circumstances, the projector's focused spot is in the center of the projection screen. If the focused spot is off-center or anomalies occur, some areas on the projection screen will inevitably have a vignetting phenomenon. For example, if the projector's focused spot appears on the screen in the shape of an "8", this is mostly due to the offset between the center of the mirror inside the projector and the position of the projection bulb, or the internal thread of the projector. The position of the lens is not caused by the wrong position; at this time, you may wish to open the projector's outer casing, and then adjust the position of the projection bulb or the position of the threaded lens to eliminate the above anomaly.

If the projector's focused spot appears on the screen in the shape of a "plum", this is mostly due to the fact that the projection bulb and the threaded lens inside the projector are not aligned. At this point, we can still adjust the placement of them according to the above method, so that most of the abnormal phenomena can be restored to normal. If the adjustment effect is not good, it may be because the convex lens on the top of the projection bulb has moved. At this point, you must also carefully fine-tune the position of the convex lens inside the projector so that the focused spot is in the center of the projection screen.

Of course, here I would like to remind you that no matter what happens to the projector during the warranty period, please try not to open the projector's outer casing yourself, because once the optical components inside the projector are damaged, please ask the manufacturer in the future. It is more difficult for the seller to provide after-sales service for you. After all, they are not responsible for human failure.