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例1机型:长虹C2152型彩色电视机故障现象:水平一条暗线。故障分析:这是进入维修状态的特有表现,通常是维修开关及相关部位有问题。该机采用单片机LA7680,其輨輯訛脚(APC滤波端)电压低于1.5V,也会导致集成电路进入维修状态,而呈现水平一条暗线。故障检修:该机色度通道如图1所示。
Example 1 Model: Changhong C2152-type color TV Fault phenomenon: a dark line. Failure Analysis: This is a unique performance into the state of maintenance, maintenance switches and related parts are usually problems. The machine uses single-chip LA7680, the error correction pin (APC filter side) voltage is lower than 1.5V, will lead to the integrated circuit into the maintenance state, showing a dark line level. Troubleshooting: The chroma channel machine shown in Figure 1.