DP3499 DP3499有声音无光栅. 检测行电路元件未见异常，测量行激励信号无输出，怀疑解码板性能不良，更换无效，测量TDA9332（13）脚行逆程电压偏低，经测C407（2KV/680P）漏电，更换后故障排除 |
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