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故障现象:据用户介绍,该机在还能收看电视节目时出现过图像亮度忽明忽暗现象,不定时行幅、场幅有压缩现象,几天后就无图、无声,只有电源指示灯亮。经前维修者修理几次,查出都是行输出管V4022SD1651)损坏,电源V90(42SA1015/反相直耦放大管)的c、e极击穿,更换上述两个元件后故障
Symptom: According to the user introduction, the machine can also watch the TV program when the image brightness flickers suddenly flicker phenomenon, irregular motion amplitude, field amplitude compression phenomenon, a few days later no picture, silent, only the power indicator light . Repairs by the former maintenance several times, are found out of line output tube V4022SD1651) damage, power V90 (42SA1015 / inverting direct-coupled amplifier) c, e pole breakdown, the replacement of the two components after the fault