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彩电光栅的亮度主要取决于加速极电压和阴极电压,加速极电压越高,亮度越大,阴极电压越高,亮度越小,掌握这一基本原理,会给检修带来极大的方便。彩电光栅出现左亮右暗的故障,一般是由于显像管的加速极电路不正常所致,而绝大多数情况下,又是由于加速极滤波电容容量减小或漏电造成的。一台夏普C—1801型彩电出现这种故障后,测加速极、阴极电压,基本正常。然后重点检查加速极,阴极滤波电容,发现加速极滤波电容C 859容量已明显减小,换一新电容,一切正常。分析原因,是因为C 859容量减小,使
The brightness of the color TV grating depends mainly on the accelerating voltage and the cathode voltage. The higher the accelerating voltage, the higher the brightness, the higher the cathode voltage and the lower the brightness. Mastering this basic principle will bring great convenience to maintenance. Left and right color TV grating appears dark failure, usually due to the tube accelerated electrode circuit is not normal due to the vast majority of cases, but also due to acceleration pole filter capacitor capacity reduction or leakage caused. A Sharp C-1801-type TV such failure, the measured acceleration pole, the cathode voltage, the basic normal. And then check the acceleration pole, the cathode filter capacitor, found that the acceleration pole filter capacitor C 859 capacity has been significantly reduced, for a new capacitor, everything is normal. Analysis of the reason is because C 859 capacity reduction