开机检查发现屏幕有光,无噪波点,字符显示正常,按P+.P-键字符能正常翻转,说明CPU不死机.试从AV端输入AV信号,图象出现,说明故障出自TDA8838(13)脚以前. 用示波器测TDA8838的(6)脚,有正常的全电视信号,再测N302的(11)脚,发现全电视信号完全没有,怀疑Z307.Z308.Z309有漏电,依次拆下开机,当拆下Z308时图象出现,测Z308发现严重漏电,更换Z308后故障排除. |
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