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实例18 机型:F2109E
故障现象:图象不良
故障检修:初步判断为电源故障,按100W灯泡电压也波动。检查取样电路无故障,接60W灯泡电压正常,说明是带负载能力差。测量+B出故障时在110~85V变化,TDA4605供电脚电压也波动。
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