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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。经试查,AV视频图像正常,故障可能出在中频电路。因本机采用的是一体化二合一高频头,可直接输出复合电视信号,估计是中放某元件性能不良所致。
Example 12 Symptom: TCLLCD3026 LCD TV, sometimes pale. Analysis and Overhaul: First of all to see whether the AV video signal to determine whether the signal is in the signal path, if so, the fault should be in the IC201 (TDA9321) and after the circuit; if not, the fault may be in front of the TDA9321 IF processing circuit. After the test, AV video image is normal, the fault may be in the IF circuit. Because the machine is integrated two-in-one high-frequency head, the composite television signal can be directly output, it is estimated that the performance of a component in the poor due.