| 故障表现为：自动黑屏 分析与检修：机器刚开机图像正常，2分钟后黑屏有伴音。测24V正常，BRI-ADJ电压3,4V正常，DIM脚电压为0.9V。DIM脚电压不正常，顺着电路往前查电阻R838阻值以增加到13K，该电阻实际是1.5K。更换R838后试机正常。 |
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