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3 因遥控电路故障而引发彩电自动关机检修四例造成遥控电路故障的原因很多,从实际检修的统计来看,因遥控电路元件不良引发的自动关机比例最高。具体说有下列五种原因:1.遥控电路中微处理器(CPU)集成电路内部性能不良,不能正确执行“人机对话”;2.遥控电源(+5V)电路不良,不能提供正常的供电或复位电压,使微处理器正常工作的必要条件未得到满足;3.复位电路不良,使微处理器内部不能正确清零复位,导致微处理器程序混乱,误发指令;4.晶振不良,常表现为漏电、热稳定性差、频率偏移等,因而
3 due to remote control circuit failure caused by auto-shutdown color TV repair four cases caused by remote control circuit failure for many reasons, from the actual maintenance of the statistics, due to poor remote control circuit components caused the highest proportion of automatic shutdown. Specifically for the following five reasons: 1. Remote control circuit in the microprocessor (CPU) integrated circuit internal performance is not good, can not correctly perform “man-machine dialogue”; 2. Remote power supply (+5 V) circuit is not good, can not provide normal power supply Or reset voltage, so that the necessary conditions for the normal operation of the microprocessor are not met; 3. bad reset circuit, the microprocessor can not reset the internal reset properly, causing the microprocessor program confusion, mistakenly sent instructions; 4. bad crystal, Often manifested as leakage, poor thermal stability, frequency offset, and so