| 怀疑是AV输入电路有故障，但反复检查未发现不正常的地方。后来又将AV信号经C242藕合从Pin26输入作试验，结果AV信号经C909藕合从Pin26输入电路有故障。替换TMPA8803后AV、TV均能正常接收。 |
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