Many people have experienced the situation that the television has a black screen with sound, and the scenes used are not the same. During the network television broadcasting, there are black screens during the boot, black screens appear during use, and other games appear during the game play. When the black screen appears, it not only affects the viewer's mood, because it can't be watched and the television becomes a decoration. In order to help everybody as much as possible, the letter brother analyzes several links and reasons why the television may have a black screen, and shares with everyone, hoping to help everyone. First, the basic structure of television The TV is basically composed of a module, a main board, a power board, a logic T-CON board, a speaker, a button, an indicator lamp, and a function module, wherein the module mainly performs TV display, the main board performs module display control, and the interface input signal Processing, the power supply board is mainly used for TV power supply (converted from 220V to various required voltages). The logic board mainly performs signal processing from the main board to the module display. The speaker is mainly used as a built-in sound player. The indicator light mainly indicates whether the boot process is effective. Second, the factors that produce a black screen Based on the composition and working principle of the integrated TV, the black screen we usually see is mainly caused by the following reasons: 1. Android software is not compatible, use the black screen appears dead; 2. There is a black screen sound in the process of playing a video on the network, which is caused by an abnormal playback platform, a slow network, and incompatible television software; 3. Abnormal brushing of software, power failure during the process of brushing, and incomplete installation package; 4. The input signal source format is incorrect or the connection line is faulty, including the output resolution and TV does not match; 5 module logic board failure, can not normal LVDS signal processing; 6. Signal connection line (upper screen line, FFC band line) contact failure or failure; 7. The module backlight is bad, including the direct-type and side-into-type lamp failures (loose or weak welding contact); 8. Power board failure, boot circuit can not start, some TV due to cost considerations, the power board and the main board combined into one; 9. The main board control circuit is abnormal, resulting in backlight control and LVDS signal input failure; 10. Open cell soft circuit source board failure; In summary, there are many reasons for the black screen, which needs to be specifically analyzed according to different application scenarios. The black screen generated by different scenes corresponds to different reasons. In some cases, it is caused by the combination of two or more factors. Third, respond to the policy after a black screen After watching a black screen on television, we should not panic. We should carefully observe what happens under the circumstances. Specific usage scenarios? Is there a repeat of power failure? With the emergence of heat engine cold? Has always appeared? Or is it that the boot appears? Need to be clear and calm, to facilitate the decision-making response. 1. After the black screen appears, check whether there is backlight. Check method: Tap the lower screen with your finger to see if there is light. If there is no backlight, then the backlight factor is larger. Solution 1: No backlight dimmed image—The power of the smart TV is normal, which may be a problem with the TV's driving backlight circuit, causing the TV's black screen to have a sound. When you approach the screen, you can find the screen shows a very dark image, which can prove that the signal processing part of the driver board is normal, then the TV is the cause of the problem is to drive the backlit high-voltage control panel switch function circuit In the event of a failure, as long as the malfunction of the functional circuit is eliminated, the screen of the television can be restored; Countermeasure II: No backlighting and no image — The smart TV may have a black screen with sounds. It may also be because the backlight of the TV screen is broken. A broken backlight of the TV can also cause the black screen of the TV. The reason for this problem is that The reason why the black screen of the television is increased is different from that of the previous one. This is caused by the load imbalance protection of the high voltage board. After the backlight of the television is broken, the TV high voltage board enters the load imbalance. The state of protection, this time you need to replace the TV's backlight to troubleshoot; 2. The black screen of the TV, the button does not work, the indicator lamp is not bright (5V breakdown) either. Countermeasure 3: The reason why the smart TV black screen has a voice may be caused by the abnormality of the power circuit of the TV. This phenomenon shows no response to the panel keys and the indicator light is not on. The first problem with such a problem is to check if the TV 12V and 5V are normal. If the voltage is normal, there may be a problem with the number of stages of the input power circuit. This is generally because the power supply is burned or the voltage regulator chip has a problem. The TV's insurance is burned and the TV's insurance needs to be replaced. Countermeasure 4: The 5V voltage of the power supply is overloaded, the voltage is pulled too low, or the signal processor of the later stage has a problem, and some circuits are damaged. At this time, it is necessary to exclude the problematic components one by one and check out the defective components. If the faulty components are replaced, the voltage can be restored to normal. Solution 5: The phenomenon of black screen sounds in smart TVs is generally caused by the TV's high-voltage inverter and control triodes being air-welded. When confronted with such problems, high-voltage inverters and controls for backlight panels are required. **The tube is re-added with tin filler, so as to solve the problem of the black screen with sound; 3. Inappropriate black screen appears when the TV is incompatible with the software. Countermeasures 6: Reboot the TV. Some black screens are caused by running software. Unqualified third-party software is unloaded and downloaded from a regular source. At the same time, the sofa housekeeper is used for cache cleaning and detection. If the fault is not eliminated, restore the factory settings directly. Or initialize, the effect is not obvious, re-use U disk to refresh the firmware. 4. There is a black screen sound phenomenon during network playback. Countermeasure 7: Replace other player software, download third-party software (such as TV cat, etc.) on the sofa butler to confirm whether or not it is caused by the background failure of the platform. Check the router network again, restart the router, reacquire IP on the TV and test the connection. Finally, it needs to be determined as a bug in the television system, which is incompatible with the playback software. This requires timely feedback to wait for official confirmation (less likely). 5. The indicator light and the start-up sound are normal, but a black screen appears on boot up. Countermeasure VIII: In addition to the countermeasures, check whether the backlight is faulty or not, and gently tap the back of the TV to see if the screen line is loose or unfavorable. If there is no failure, the upper screen or FFC tape, logic board, Opencell source board, etc. may malfunction, and the rear cover needs to be inserted for further confirmation. 6. Signal source input, but no black screen display. Countermeasures 10: TV comes with HDMI, AV, USB, VGA interface, a variety of input sources, the resolution of the TV and the input source player output resolution must be unified, otherwise it will cause resolution does not meet, leading to TV There is no input display, and a black screen appears. The countermeasure is to check the signal line and set the player resolution. In the above, the common black screen phenomenon of television is classified and analyzed according to different classifications and different scenes appearing to formulate different countermeasures. There are many reasons for the black screen phenomenon in different scenarios and environments, which may be caused by the overlapping of several causes. Therefore, when parents are dealing with different black screen phenomena, they need to be analyzed calmly and need to pay attention to the difference between heat engine and cold machine. Smart TV/box information can focus on smart TV information network sofa butler (http://), China's influential TV box and smart TV website, providing information, communication, TV boxes, smart TVs, smart TV software, etc. Answering questions.