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看了《家庭电子》2000年第8期中的《给电视机增加(消画)功能》后,笔者认为此电路无法使用。在原文中主要是断开TA7698的12V供电来实现“消画”功能的,其实TA7698在整个电路中的作用非常重要。它的主要功能包括:一亮度电路;二色度解码电路;三扫描电路。扫描电路的工作状态与开关电源电路的工作状态有密切联系,并相互牵制。当扫描电路发生故障时,多数整机电源不工作或处于保护状态。由此可见TA7698不工作,行、场扫描便不工作,整机也不工作,听电视就不能实现。遥控部分的微处理器M50346-560SP为日本三
Read the “Home Electronics” 2000 the eighth period in the “television to increase (eliminate painting) function”, I think this circuit can not be used. In the original text is to disconnect the TA7698 12V power supply to achieve the “consumer picture” function, in fact, the role of TA7698 in the entire circuit is very important. Its main functions include: a brightness circuit; two chrominance decoding circuit; three scan circuit. The working state of the scanning circuit is closely linked with the working state of the switching power supply circuit, and each other. When the scan circuit fails, most of the machine power is not working or in a protected state. This shows that TA7698 does not work, line, field scanning will not work, the machine does not work, listening to TV can not be achieved. Remote part of the microprocessor M50346-560SP Japan III