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一、TC—M25C无声无光故障分析:彩电出现无声无光现象,应先检查电源是否正常。用万用表测量+B电压,发现+B端电压不正常。测量Q_(802)(2SC2458)基极电压为0.6V,而该保护电路不动作时,此电压应为0V,判断保护电路已工作。断开Q_(802)基极,取消保护,再检测12V、20V、25V电源回路中的电流,发现25V电源
First, TC-M25C silent Analysis of failure: color TV appeared silent phenomenon, you should first check the power is normal. Measured with a multimeter + B voltage, + B terminal voltage is not normal. Measuring Q_ (802) (2SC2458) base voltage of 0.6V, and the protection circuit is not operating, the voltage should be 0V, to determine the protection circuit has been working. Disconnect Q_ (802) base, cancel the protection, and then detect the current in the 12V, 20V, 25V power circuit and found that 25V power supply