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[例1]故障现象 电视机主电源开关合上,进入正常收看状态,但无法用遥控器使电视机处于等待状态,其它操作均正常。 分析与维修 根据故障现象,可以认为微处理器IC1101(BM5069)的电源控制电路及电源被控电路存在故障。 电源部分待命电路的工作原理是:当电视机处于正常收看状态下,按遥控器“等待”键,IC1101解析遥控器发射的数据信号,使IC1101的(32)脚的输出由高电平变为低电平
[Example 1] Symptom The main power switch of the TV is turned on to enter the normal watching status, but the remote control can not be used to make the television wait for the rest of the operations. Analysis and Maintenance According to the fault phenomenon, it can be considered microprocessor IC1101 (BM5069) power control circuit and power control circuit fault. The working principle of the standby part of the power supply circuit is as follows: When the TV is in a normal watching state, press the “wait” button on the remote control, the IC1101 interprets the data signal transmitted by the remote control, so that the output of the IC1101’s (32) Low level