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《家电检修技术》2001年第1期《彩电场输出集成块屡损的故障分析》一文写的很有代表性,给许多初学者指明了类似TA8403场输出块(如:LA7830、LA7837、TDA3653等)屡烧的基本原因,本人也发表一点个人观点,以供同行参考。 1.原图2中D1不正确,正确电路图应如下图1所示,如果D1反接,会使场输出管V2和V3因偏置不正确而烧坏或工作异常。 2.TA8403泵电源升压电容C455容量减小或失效
“Home Appliances Maintenance Technology” 2001 the first period “color TV output manifold loss of repeated failures,” a text written representative of many beginners pointed out similar to TA8403 field output block (such as: LA7830, LA7837, TDA3653, etc. The basic reason for repeated burns, I also made a little personal point of view for peer reference. 1. The original D1 in Figure 2 is incorrect. The correct circuit diagram should be as shown in Figure 1 below. If D1 is reverse connected, field output tubes V2 and V3 will burn out or work abnormally due to incorrect biasing. 2.TA8403 pump power boost capacitor C455 reduced capacity or failure