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2)遥控系统主机电源开/关控制电路故障分析遥控系统主机电源开/关控制电路的常见故障现象是:主机电源不能启动工作或启动困难,时好时坏;遥控开/关机功能失效,对主机电源不能进行开/关控制;开机“等待”指示灯亮,但按主机电源开机键,电视机无反映,待机指示灯不灭;主机电源开启后不定期自动关机,等等。其故障原因主要有:①微处理器性能不良或损坏;②微处理器正常工作所需的外部条件(+5V工作电源电压、复位电平、时钟振荡)被破坏;③驱动接口电路元件损坏;④本机面板键粘连漏电;⑤被
2) Remote control system host power on / off control circuit fault analysis Remote control system host power on / off control circuit common fault phenomenon is: the host power can not start working or start-up difficulties, good times and bad; remote control on / off function failure, The host power can not be on / off control; boot “waiting” indicator light, but press the host power button, the TV does not reflect the standby indicator is not off; host power is turned on from time to time automatically shut down, and so on. The main reasons for the failure are: ① poor or damaged microprocessor performance; ② external microprocessor normal working conditions (+5 V power supply voltage, reset level, clock oscillation) is destroyed; ③ drive interface circuit components damaged; ④ local panel key adhesion leakage; ⑤ be