论文部分内容阅读
例1 神彩SC6401彩电,调低亮度能勉强收看,图声基本正常。但开至正常亮度后,图声逐渐变差、消失,光栅呈白板状且上下抖动。检修:通电检测电源的两组输出电压,在低亮度下,129V变为110V,18V变为16V;开大亮度后,129V变为95V,18V变为12V且均有抖动现象。由此可判断本机带负载能力变差,故障在电源电路。测整流输出端(C808两端)电压为310V(正常),开大亮度后不变,
Example 1 God color SC6401 color TV, reduce the brightness can barely watch, the sound of the picture is normal. However, open to normal brightness, the sound gradually worsened, disappeared, the grating was white plate and jitter up and down. Overhaul: power supply test two sets of output voltage, under low brightness, 129V into 110V, 18V into 16V; open a large brightness, 129V into 95V, 18V into 12V and jitter. This can be judged by this machine with a load capacity worse, fault in the power circuit. Rectifier output (C808 ends) the voltage is 310V (normal), open the same brightness,