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在采用开关式稳压电源的彩电和部分进口黑白电视机中,当开关晶体管损坏换新时,有时遇到换上新管后,电源不起振或输出电压偏低很多。查电源及负载的各元器件也无问题。这时可测一下新管的h_(FE),会发现偏低,这就是电源不起振的原因。也有的彩色
Switching power supply in the use of color TV and part of the import of black and white TV, when the switch transistor damage replacement, sometimes encounter a new tube replaced, the power supply can not afford to vibration or a lot of low output voltage. Check the power and load the components are also no problem. At this time can be measured h_ (FE) of the new tube, will find low, this is the reason the power can not afford to vibration. There are some color