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[例一]机型:T953P Ⅲ故障现象:开机时有满屏噪波信号,但音像全无,面板按键、遥控均不起作用,也无显示,拔、插闭路天线有干扰信号。分析检修:从故障现象分析,可以断定是控制系统不工作所至。开机检测N_(601)(微处理芯片,型号是M50436—560SP)第(52)脚电源电压为0V,测遥控变压器T_(401)次级交流电压,同样为0V。于是断定该变压器初级开路,因为对于这种耗电极少的电路而言,变压器次级开路非常少见。剪开变压器初级接线并测其电阻,
[Example 1] Model: T953P Ⅲ Symptom: There is a full screen noise signal when powering on, but there is no audio and video at all. The panel keys and the remote control are ineffective, and there is no signal to display or pull the antenna. Analysis and maintenance: From the failure phenomenon analysis, it can be concluded that the control system does not work. Boot detection N_ (601) (micro-processing chip, model M50436-560SP) (52) pin power supply voltage is 0V, measured remote control transformer T_ (401) secondary AC voltage, the same as 0V. The primary open circuit of the transformer was concluded, because the transformer secondary open circuit is very rare for such a circuit that consumes very little power. Cut the transformer primary wiring and test its resistance,