| 故障表现为：无伴音，屏闪 分析与检修：刚开机有图像无声音，怀疑软件问题，升级软件无效。开机检测24V电压为20.6低于正常值，测取样电路R428/R425/R427/R429/R430/U402正常，代换C416/C415无效测集成电路U402 1脚对地电阻0.629K（正常为13K）代换C407后24V电压正常，试机故障消除。 |
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