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1. 故障现象:无光声故障部位:电源部分故障检查与分析:该机发生无光声故障,一般是由电源部分或行输出部分引起。可先用万用表测电源输出108V是否正常,若无108V输出,有二种原因造成:(a)电源电路自身工作不正常;(b)负载有短路性故障或负载过大引起保护电路动作。可用下法判断与处理。先用万用表电阻档测量行输出管BG702集一射之间的直流电阻值,若小于2kΩ,焊下BG_(702),经复测发现该管已击穿,这时按一般情况换上好的行输出管就可以了。但需注意的是:采用高压方案供电的彩电中就不能冒然换上新管。
1. Symptoms: no light sound Fault location: Power part of the fault inspection and analysis: The machine occurred in the light of the sound fault, usually by the power part of the line or part of the output caused. Can use a multimeter to measure the power output 108V is normal, if there is no 108V output, there are two reasons: (a) power supply circuit itself is not working properly; (b) load short circuit fault or overload caused by protection circuit action. Available under the law to determine and deal with. First with a multimeter resistance measurement line output tube BG702 sets a DC resistance between shots, if less than 2kΩ, welding BG_ (702), the retest found that the tube has been punctured, then according to the general situation for a good Line output tube on it. But it should be noted that: the use of high-voltage programs in the color TV can not be replaced by a new tube.