Wrong video output mode (PAL / NTSC) is selected o n STB. To operate the video output, you must use the SD mode»: If the blue window is displayed on a black TV screen with the message "This video output does not work in HD mode. 
If there is no picture on the TV screen, video mode on TV and STB may not be matched - enter Bootloader menu - off/on STB power and press Menu key on the remote control (the screen remains black) and change the STB video mode by pressing F1 key. On TV: сheck socket ( HDMI / RCA) to which the cable is plugged and make sure that the setting of the source is correct. Ensure that cable is in good condition. Make sure that the cable is securely connected on both sides (TV and STB). Problems with the video interface cable (HDMI, RCA):. Check the power supply for parameters specified in the STB user manual. STB power supply unit is not working properly or has not suitable parameters (this case, STB LED can be lit):. Make sure that both devices (STB and TV) are connected to the power supply. No power supply at Set-Top Box or TV or one of the devices (STB or TV) does not work properly. The following figure shows the evolution of NTP. Mills - a professor at the University of Delaware, and evolved from the Time Protocol and the ICMP Timestamp message. NTP is one of the earliest standards for clock synchronization on a network. The precision of NTP can reach 1 ms on a LAN and tens of milliseconds on a WAN. NTP is a protocol used to synchronize the clocks of hosts on a network to the UTC time. In conclusion, a unified standard time is of great significance to the network. System time: Some applications or services require accurate time to mark user login and transaction information to ensure event traceability. Collaborative processing: When several systems work together to process the same complex event, they must use the same clock for reference to ensure correct sequencing of operations. If these requirements are not met, inaccurate billing will occur and result in doubts and complaints of users. Billing system: Billing services must know the time accurately and require consistent time on all devices. 
If the system time of different devices is inconsistent, accurately correlating log files between these devices is difficult, or even impossible.
Network management: Analysis on logs collected from different network devices must be performed based on time. Accurate time is critical to the network for many reasons, for example:
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