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故障现象:开机“三无”,前面板红色指示灯亮。分析与检修:一般来说,“三无”故障涉及面很广,此机前面板指示灯亮,可肯定有一部分电路上作。由于此机图纸已丢失,无法从原理上分析可能产生故障的大致部位,只能一步步地查找、分析、判断了。拆开电视机后壳,首先查看电源电路部分,发现此机并没有单独的遥控变压器,说明此机为单电源待机,既 CPU 用电也是由主电源提供,因此遥控关机存在两种可能:一是遥控关机时主电压维持原值,关断的是行推动电压及低电压;二是遥控关机时,电
Symptom: boot “three noes”, the front panel red light is on. Analysis and Maintenance: In general, the “three no” fault involving a wide range of lights on the front panel of this machine, you can certainly have some of the circuit for. Because this machine drawing has been lost, can not be analyzed in principle the possible parts of the fault can only be found, analyzed and judged step by step. Open the TV back cover, first check the power circuit part and found that this machine does not have a separate remote control transformer, indicating that this machine is a single power standby, both CPU power is also provided by the main power supply, remote shutdown there are two possibilities: a Is the remote control when the main voltage to maintain the original value off, off the line to promote the voltage and low voltage; second remote shutdown, the electricity