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我家有一台索尼KV—1430CH 35 cm(14英寸)彩电,已使用18年了,前年出现色彩偏红故障,其他色彩被掩盖了。该机属于单枪蓝束显像管,试调红、绿、蓝背景可调电阻,蓝、绿背景有变化,而红背景无变化。分别测量红、绿、蓝三只视放管(2SC2278)三个极的工作电压,除红视放管Q701集电极电压只有80 V(比图标169.4 V低),其余都正常,估计是显像管红阴极(K_R极)漏电或老化,造成该极发射电子能力加强。
My family has a Sony KV-1430CH 35 cm (14 inches) color TV, has been in use for 18 years, the previous year reddish color failure, the other colors are covered. The machine belongs to a single gun blue beam picture tube, try adjustable red, green, blue background resistance, blue, green background has changed, while the red background no change. Respectively measure the working voltage of the three poles of red, green and blue tubes (2SC2278). Except for red tube, the collector voltage of Q701 is only 80 V (lower than the icon of 169.4 V), and the rest are normal. Cathode (K_R pole) leakage or aging, resulting in the enhanced emission power of the electrode.