测主电源电压为130V正常,按遥控器上待机/开机键CPU(41)脚有高.低电平变化.说明CPU部分基本正常,再测推动管V451集电极电压也是130V,说明行停振. 查行振荡启动电源脚N302(37)脚电压为0V,再查电源板上N703的(4)脚无8V输出,测N703(1)脚电压为0V,又测V757基极电压也是0V,确定V757击穿或漏电,更换V 757后故障排除. |
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