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故障现象:一台松下TC-1830型彩电,出现热机“三无”(关机3～5分钟后开机又正常)。分析与检修:电视机出现热机“三无”故障,说明电源电路或者行电路中某种管子的热稳定性能下降。为了区分电视机因某管脚虚焊引起的热机“三无”故障,开机后先用绝缘柄起子轻轻敲击电路板上电源电路和行电路管子的管脚,反复2～3遍,没发现电视机屏幕画面有中断现象,说明故障来源不是由管脚虚焊引起的。待出现热机“三无”故障现象时,测量电源电路的输
Symptom: A Panasonic TC-1830-type color TV, there heat engine “three noes” (shutdown 3 to 5 minutes after the boot and normal). Analysis and Overhaul: TV appeared heat engine “three no” failure, indicating that the power circuit or the line circuit in a tube thermal stability decreased. In order to distinguish the TV due to a pin Weld caused by the heat engine “three no” failure, start with an insulated handle screwdriver gently tap the power circuit on the circuit board and the circuit tube pins, repeated 2 to 3 times, no Found that the TV screen has an interruption of the screen, indicating that the source of the fault is not caused by the solder joints feet. To be hot machine “three no” failure phenomenon, the measurement of power supply circuit