故障现象:笔者检修了三台TCL9625彩电,都是电源部分C829电解电容失效引起屏幕上有3cm左右均等间隔向上滚动的水平亮带,无伴音,但有频率为300Hz左右的低频信号叫声且不随音量增减键变化。开始C829失效不严重时,图声慢慢能恢复正常,严重时需几分钟以上。分析:引起该电容失效的原因是:电源部分R826及Q804的散热片距C829太近而长期烘烤C829,使其 Symptoms: The author overhaul the three TCL9625 color TV, is the power part of the C829 electrolytic capacitor failure caused by the screen about 3cm horizontal scroll up evenly spaced with bright, no sound, but the frequency of about 300Hz low frequency signal and does not Volume up or down key changes. At the beginning of C829 failure is not serious, the figure can slowly return to normal, serious need more than a few minutes. Analysis: The cause of the failure of the capacitor is: the power part of the heat sink R826 and Q804 is too close to C829 long-term baking C829, so that