We diviided the led light according to the using eviiroment. Most of our product is the commercial LED Lighting
Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
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A: Question: The TV output is out of sync with the sound
Solution: When this problem occurs, the problem usually arises in the set-top box. It only needs to start from the set-top box.
II: Question: Some TV channels have no signal output
Solution: Find the channel with no signal output, first find the corresponding set-top box, and see if the signal light on the set-top box is on. If it is not on, then start from the set-top box.
III: Question: TV signal is not good, there are snow spots
Solution: First check whether there is any problem with the output circuit of the modulator. The main point is to see if there is any insulator on the copper core in the line connecting the modulator. Check whether there is any problem with the floor brancher and the fixed trunk connected to the room. You can pass the paragraph test until you find out where the signal interference source is. If there is a problem with the line, you can consider changing the frequency band of the modulator to solve some problems.
Four: Question: TV has no sound or noise
solve:
1, the original sound, suddenly there is no sound for a few days but there are images, this situation is generally a problem in the set-top box, the set-top box can solve the problem from Kai.
2. Another is that there is no sound or noise in the image after installation. This situation is related to the sound system. Our product modulator is divided into two types of “D/KI†system. In the general case, the default tone of the TV is D/K, and the tone of the modulator is I. In this case, you need to change the channel without audio to I on the TV. Different TV half-tone modes also have different “6.5MHz-6.0MHzâ€. This TV defaults to 6.5MHz, and the same as the above is changed to 6.0MHz. can.
V: Question: Many television shows have a mosaic problem
Solution: The reason for the occurrence of mosaic is mainly from the signal trunk. Most of the reasons are caused by the signal being too weak. Of course, it is also caused by too strong, because the set-top box has poor signal processing capability. In this case, Generally speaking, cable TV regulates the strength of the backbone signal source or increases the amplifier at the local front end to solve the problem of too weak signal source, and increases the reason that the branch distributor solves the problem of too strong signal. Six: Other: In the course of operation, the damage of its related accessories is difficult to detect, such as distributors, mixers and other accessories, according to the problems appear, the program of the problem, identify the causes and solve the reasons.
Six, TV screen without program image
[Cause Analysis] When this happens after the set-top box and TV set start up normally, there are three possibilities: (1) the set-top box RF input signal is too low or no signal, (2) the audio and video cables are not properly connected or the interface is damaged, ( 3) The TV conversion settings are not adjusted to the correct position.
[Case and Maintenance] When a resident of a family hospital in Mazhou City turned the TV on the function button, there was no image failure on the screen. Measure the set-top box input level, the result is normal, check the audio and video cable access, has been correctly connected in accordance with the red, white and yellow. After careful inquiry, the user said that he had moved the set-top box and connected the audio and video cables. Because the TV has three audio and video cable interfaces, the audio and video cables are transferred to another group and the fault is eliminated. Post-detection found that the original set of audio and video interfaces was bad.
Seven, a few channels appear mosaic
[Cause Analysis] There are mosaics on individual channels, indicating that the set-top box has been able to receive TV signals normally, the system control circuit is working properly, and the set channel parameters are also normal. The reasons for this failure may be: (1) The signal is weak due to the influence of weather and geographical environment, and the receiving performance is degraded. (2) The signal quality of the joint is too high to cause error.
[Case and Exclusion] A user near Hua Zuyi reported that the digital TV signal was poor. He went to the repair and discovered that there was a mosaic in the “Fun Fan†and “Kissing Baby†channels. Check the input signal level, the value is about 75dB, which is normal. It is normal to check the audio and video cable and the indoor cable connector. Then along the line to the outside of the inspection, and finally found that the interface between the branch and the user line at the head loose. Cut and redo the F-joint. After the connection, the mosaic disappears and the fault is eliminated.
Eight, many channels appear mosaic
[Cause Analysis] Errors are the main cause of mosaics. When the signal level is normal and the access equipment is normal, mosaics appear on many channels. The possible causes are: (1) The LNB power supply circuit in the set top box is faulty; (2) The circuit in the tuner in the set top box is damaged, and (3) The system error occured. The biggest possibility is that the set-top box has failed and cannot be decoded normally.
[Case and Maintenance] Most users of digital TV on Xinhua Road appear mosaics. Check the indoor connector and signal level are normal, check the line along the home did not find the problem. Initially determine that the set-top box is faulty, and troubleshoot after replacing the same type of set-top box. Open the original set-top box and find that the LNB power supply circuit is damaged.
Nine, lack of channel programs
[Cause Analysis] Digital TV lacks a channel program, which is mainly a circuit problem. Such as poor indoor lines, outdoor line aging, or access lines do not match the system.
[Case and Maintenance] It is normal for one inhabitant of Tsinghua Court to receive other programs, except for 1 to 12 sets of CCTV. Restoring the original factory settings and re-searching still failed to find the CCTV. It was normal to check the signal level of the set-top box access signal. Taking into account that the community is entirely new, there should be no problem with outdoor signals. Then the wall terminal box was opened for inspection. As a result, it was found that the 5-wire cable had two joints, and was in conjunction with the other two cables, which seriously affected the impedance matching. After negotiating with the user, the replacement of a national standard cable and the reduction of joints eventually led to troubleshooting and users were more satisfied.
Ten, there is no sound for individual channels
[Cause Analysis] There is no sound in the individual channels. This is mainly due to an error in the set-top box system settings. It is necessary to restore the factory settings and perform a new search.
[Case and Maintenance] A resident of Hehuan Garden used the Konka set-top box. Other channels are normal, but Jiangsu Satellite TV has no voice. Turn the volume of the TV and set-top box to the maximum and there is still no sound. The check did not press the mute button. The initial suspicion is that the set-top box system has failed. Then enter the factory password (000), restore the factory settings, exit and then perform a full-channel search, until the search returns to 100%, the final troubleshooting.
11. Crosstalk failure
[Cause Analysis] There are two kinds of possible crosstalk faults: one is the same frequency interference and the other is that the channel is set incorrectly. In digital television signals, the same frequency is less, mainly the channel setting problem.
[Case and Maintenance] When the users of the Emperor Community in Dongjie, a state watched Henan Satellite TV, there was always a broadcast noise interference and the crosstalk was very serious. The set-top box model was Huawei C2300. Since the frequency of Henan Satellite TV is far away from the broadcasting frequency band, it is impossible to generate the same frequency interference, so it is suspected that the channel setting problem. Check the set-top box channel setting and find that the channel is set on the right channel or mixed channel, and the channel is adjusted to the left channel and the fault is eliminated. According to the author's experience, if you encounter crosstalk faults, you must first check the channel settings, if you can not eliminate the fault after the change settings, you can remove an audio cable, that is, retain two audio and video lines on it.
Twelve, there is a smart card failure
[Cause Analysis] When the TV screen is blank and a “Smart Card Invalid†error is displayed, the main reason is that the card is in bad contact and the set-top box cannot correctly read the contents on the chip.
[Case & Maintenance] There is no picture after turning on the TV, and “Smart Card Invalid†appears. Check signal and cable connector are all normal, and exiting search again will not solve the problem. Open the smart card panel on the front of the STB, and the fault disappears after the smart card is replugged. But soon the fault reappeared and the original set-top box (or smart card) was eventually replaced to completely solve the problem.
Hotel Digital TV Retrofit Project Common Faults and Solutions
As the State Administration of Radio, Film and Television shut down the original analog signals, forcibly promoted the popularization of set-top boxes, and the number of digital television users continued to increase, the problem of digital signal failures began to surface in large numbers. According to the first-line promotion and maintenance experience over the past three years, the technicians of Goodview Electronics Co., Ltd. analyzed and summarized the common faults, and obtained some effective solutions to provide the digital cable TV front-end renovation project of the hotel and hotel factory hospital. Peer reference for reference.