现在市场上有多种“电源模块”出售,使用该类“电源模块”对修复彩电开关电源来说,既节约时间,且成本也可接受。但该类模块没有提供其内部电路图,其本身出现故障后,大多同行将其废弃。为方便同行的维修工作,笔者根据实物绘出其内部电路图,并对其工作原理加以分析,供同行参考(图1中元件号为笔者为方便叙述所加)。一、UC3842简介 Now on the market a variety of “power module ” for sale, the use of such “power module ” to repair color TV switching power supply, saving time and the cost is acceptable. However, this type of module does not provide its internal circuit diagram, its own failure, most of its peers abandoned. In order to facilitate the maintenance work of the colleague, the author draws out its internal circuit diagram according to the real object, and analyzes its working principle for the colleague’s reference (the part number in Fig. 1 is the author adds for the convenience narration). First, UC3842 profile