The establishment of a giant screen HD home theater, the projector is an essential equipment. However, the projector is a highly integrated audio-visual equipment. When non-enters are purchasing ("How to buy a home theater projector correctly") and using it, there are always various problems that cannot be solved. The 8 home theater projectors compiled are easy to encounter faults and propose solutions. You can refer to them when you encounter them.
1. Why is there no reaction after the projector is powered on?
Since the projector does not respond after the power is turned on, it is likely that there is a problem with the power supply of the projector. However, is there a problem with the internal power supply of the projector or the external power supply? For this, you should check the projector first. Whether the external power supply specification is the same as the standard required by the projector. For example, if the external power socket is not grounded or the power cable used by the projector is not equipped with the projector, this may cause the projector power input to be abnormal. If you determine that the external power supply is normal, you can conclude that the internal power supply circuit of the projector has been damaged. At this time, you only have to replace the new internal power supply of the projector.
2. Why does the projector suddenly shut down during work?
If the projector suddenly shuts down during the work, there are two main reasons. First, the user may accidentally cut off the power of the projector during operation. Therefore, you should first check if the projector is turned off due to human factors. Excluding this situation indicates that the projector itself has a problem and is most likely caused by thermal protection. Because there are many high-end projectors in order to extend the life of the projector, a self-thermal protection function is often used. When there is too much heat generated inside the projector, the working state of the projector will automatically work under this protection state. The projector is automatically turned off, and in this state, the projector does not respond to any external input control; therefore, when this happens, you should not worry about the sudden failure of the projector, you only need to shut down the projector automatically. After about half an hour, and then turn on the projector in the normal boot sequence, the projector will return to normal operation.
3. Why does the projection screen appear white or even blue-violet plaque?
A white or even blue-violet plaque will appear on the projection screen, indicating that the red polarizer in the projector's internal optical system is damaged, so that the image projected by the projector will have a color cast phenomenon. The solution to this problem is to replace it. A new red polarizer. However, the replacement of the red polarizer requires opening the outer casing of the projector. However, due to the high voltage inside the projector, it may cause harm to the human body. Therefore, it is best to ask a professional maintenance person to replace the red polarizer. You can also send the projector to the repair shop for replacement.
4. Why can the projector resume normal operation after replacing the power cord?
If the projector can work normally after it has not been able to work with the power cord, it means that there is no problem with the projector itself. The problem should be on the projector power cable. Generally speaking, the power cord specifications and compatibility of the defective projector will be significantly different from the power cord specifications and compatibility of the original projector. Once the defective projector power cord is used, it may seriously affect the product. Stability of use. For example, the projector's power supply specifications are 110V and compatibility with 220V. If the manufacturer fails to modify the 110V power supply specification to become a product suitable for Chinese users, then this product will definitely come back after purchase. Poor compatibility and short life. Therefore, you must test the power of the projector on the spot when you buy it. Also check whether the normal working voltage of the projector is 220 volts.
5. Why can't the projector project the picture?
The projector does not display the content correctly. The connection of the projector may be problematic. If the connection is good, check the laptop connected to the projector to see if the external video port of the computer has been activated. Generally speaking, the current laptop provides the FN function switch button. Pressing the button and clicking the corresponding function button labeled LCD/CRT or monitor icon activates the video port of the computer. In addition, you should also The projector's signal input port is used to switch the projector to the corresponding RGB port to ensure the projector's projection is normal.
6. Why can't I project the entire image content?
The entire image content cannot be projected, indicating that there is a problem with the display resolution of the projector. At this time, you can readjust the resolution parameters of the computer and the resolution parameters of the projector so that their sizes match each other.
7. Why does the projection machine produce distortion distortion?
The content projected by the projector is distorted. It is very likely that the position between the projector and the projection screen is not square. To eliminate this deformation distortion, you can adjust the projector's lifting foot or adjust the projection screen. The height of the position ensures that the image projected on the screen is rectangular.
8. Why does the projection machine produce image color distortion?
If the projector produces image color distortion, it indicates that there is a problem with the projector's color settings. You can press the projector's remote control or the menu button on the projector's control panel and select all the reset commands under the display menu. If the method does not solve the color problem, you need to carefully check whether there is a bent or broken pin on the display signal line. If the pin is damaged, you need to replace the display signal line.
When the projector is not working properly, the user should not make any changes, so as not to make the fault serious. It is best to find professional audio-visual people or maintenance personnel to check.
LTE CAT4/CAT6 Definition
The full name of LTE CAT is LTE UE-category, which is broken down to explain :LTE refers to 4G LTE network, UE refers to user equipment, and Category is translated as level. Smooth interpretation is the level of 4G LTE network transmission rate that user devices can support, which can also be said to be a technical standard for 4G network speed. Therefore, LTE CAT4/CAT6 means that the user device LTE network access capability level is 4 or 6.
Since the level is different, then its capabilities are certainly not the same, let's take a look at LTE CAT4/CAT6 affect what performance, respectively, what level. Simply put, LTE CAT affects the upper limit of 4G LTE uplink and downlink network speed, which is generally referred to as the maximum upload and download speed that a user device can achieve.
There are not only 4 and 6 levels in LTE CAT, but the table above is our list of currently known LTE CAT levels and the corresponding maximum transmission speed. Among them, LTE CAT4/CAT6 is also the current network transmission technology level of 4G mobile phones, while the faster CAT7 and CAT8 are still in the laboratory stage and have not been commercially developed.
Phones and chips that support LTE CAT4/CAT6
As far as the current 4G mobile phone market is concerned, most mobile phone products are CAT4 technology, and only a small number of new mobile phones use CAT6 technology, such as Huawei Honor 6, Samsung Galaxy S5 advanced version and LG G3 Cat6, and the concept of LTE CAT6 is proposed by Huawei Honor 6.
For the mobile phone LTE CAT4/CAT6 standard, it is directly linked to the mobile phone chip, or, if you know the processor of the mobile phone, you know which technology the mobile phone uses. For the current 4G mobile phone chips, only Huawei Kirin 920 and Qualcomm Snapdragon 805 processors for LTE CAT6, before this 4G chips are LTE CAT4, the future and Kirin 930, Qualcomm Snapdragon 808/810 will support LTE CAT6. Mediatek won't have LTE CAT6 chips until the second half of next year.
Qualcomm Snapdragon 805, 808, and 810 also support LTE CAT6
It is worth mentioning here that Qualcomm Snapdragon 805 and Kirin 920 are not the same in chip design, the LTE CAT6 baseband of Snapdragon 805 is an external Gobi MDM9x35, while Kirin 920 is a direct SoC integration, and the chip is integrated, this point Kirin 920 has ultra-high integration. It has certain advantages in power consumption and cost. As a leading international communications company, Huawei's strength can not be underestimated, but also the pride of our people.
The actual use value of LTE CAT6
Upload, download speed is our use of mobile Internet access the most concerned performance, but it should be clear that the LTECAT standard is the 4G transmission speed limit, and can not improve the transmission speed, in the operator's 4G network speed has not reached the next standard, simply raising the limit is meaningless. At present, the 4G networks of domestic operators are all LTE CAT4 standards, and the peak download speed is 150Mbps, but it is difficult to reach the upper limit of LTE CAT4 in practical applications, and even to reach 100Mbps is very difficult, so at this stage LTE CAT6 has no use value.
In terms of real life applications, LTE CAT6 is not as beautiful as we think. We can do a calculation, according to the formula 1MB/s=8Mbps, the maximum download speed of LTE CAT4 is 18.75MB/s, such a download speed, for 1080P video online playback has no pressure, even 4K online film source still can not occupy such a large bandwidth, So LTE CAT6 has no use either.
To sum up, LTE CAT6 does not have much use value at this stage, and the term is only a gimmick of manufacturers, until the operator 4G standard reaches LTE CAT6, I believe that LTE CAT6 equipment has long been popular. So as for whether the phone is LTE CAT4 or LTE CAT6, you don't have to care.
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