Abstract:

The NV7700 set-top box is a common digital television SDTV set top box.It is used mainly by urban and rural users.The popularization of digital TV and sharp increase of its market share lead to the frequent occurrence of such problems as TV collapse as well as unsuccessful upgrade and search.This article introduces the principle of the set-top box,elaborates the working principle of two NV7700 set-top boxes,and classifies the common fault principles.It is a reference for the daily use and maintenance of set top boxes.

Key words: STB;maintenance;COSHIP