摘要：例12故障现象：TCLLCD3026液晶彩电，有时彩色淡。 分析与检修：首先看AV视频信号有无来确定信号是否出在信号通道，若有，故障应出在IC201（TDA9321）及后级电路；若无，故障可能出在TDA9321之前即中频处理电路。
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