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故障现象:一台北京2107型电视机,据用户讲,此机最初故障是按遥控器上的顺序选台“CH”键,有时会产生自动关机现象。放暑假后,孩子在家不知怎么捅鼓的,无法正常收看了,送一修理部修了一天,也没有修好,只好转修。分析与检修:电视机送来时,电源开关管已拆除,换上电源开关管,查电源其他元件无问题,断开行电源接430n电阻为假负载,开机主电压为116V,属正常。接通行电路光栅出现,但无图、无声,按前面板“CH”选台键,电视机无反应。也没有屏显指示,但按前
Symptom: A Beijing 2107 TV, according to the user speaking, the initial failure of this machine is the order by the remote control “CH ” button, and sometimes have an automatic shutdown phenomenon. After the summer vacation, children at home, I do not know how to poke drums, can not normally watch, send a repair department repair a day, there is no fix, had to repair. Analysis and overhaul: TV sent, the power switch has been removed, put on the power switch, check the power of other components without problems, disconnect the power supply then 430n resistor is a dummy load, the boot main voltage is 116V, is normal. Connect the circuit raster appears, but no picture, silent, press the front panel “CH ” channel selection key, the TV no response. There are no on-screen instructions, but press