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彩色电视机都使用开关稳压电源,整机“二次电源”又受行扫描电路控制;电源电路硬行扫描电路能否正常工作,又受彩电CPU电路及各种保护电路控制。所以当彩电出现“启动困难”的软故障时,其涉及范围非常广泛。本着先电源后行扫描电路,再保护电路及CPU电路的检修顺序,采用“指针式”与“数字式”万用表相结合的方法,下面分为六个方面略举几例试作分析。
Color TV switch power supply are used, the whole “secondary power supply” by the line scan circuit control; power circuit hard line scan circuit can work properly, but also by the color TV CPU circuit and a variety of protection circuit control. So when the color TV “hard to start” soft fault, its scope is very wide. In the first after the power line scanning circuit, then the protection circuit and the CPU circuit maintenance order, the use of “pointer” and “digital” multimeter combination of the following is divided into six aspects to give a few examples of trial analysis.