论文部分内容阅读
例1 三洋83P机芯彩电,易发生图像颜色无规律变化的故障现象,有时缺某种颜色,有时底色偏重某种颜色。这种故障,多属视放厚膜电路HM190内部软损坏而造成工作不稳定,此件不易修复,只能用同规格厚膜电路更换。例2 东芝X56机芯彩电,图像上半部易出现数条乃至数十条点线相间、混杂的白色细线干扰,且线数随节目内容变化而变化,无信号时,亦能看见少量白线。遇此故障现象,白线数少时,多属场输出电路自举电容C_(312)容量变小或失效;白线多数是场输出管Q_(306)c极负载电阻R_(325)阻值变大或开路所致,此电阻损坏,表测其c、e极对地电压均比正常偏低约10V左右,直接量其
Example 1 Sanyo 83P movement color TV, prone to irregular changes in the color of the image phenomenon, and sometimes the lack of a color, and sometimes the background color emphasis on a certain color. This failure, mostly due to put thick film circuit HM190 internal soft damage caused by unstable work, this piece is not easy to repair, only the same specifications thick film circuit replacement. Example 2 Toshiba X56 movement color TV, prone to appear in the upper part of the image of several or even dozens of dotted lines, mixed white thin line interference, and the line number changes with the program content, no signal, you can see a small amount of white line. In the case of this fault phenomenon, when the number of white lines is small, the capacitance of the bootstrap capacitor C_ (312) in a plurality of field output circuits becomes smaller or fails; the white line is mostly the field output tube Q_ (306) c The load resistor R_ (325) Large or open due to this resistance damage, the table measured its c, e pole voltage is about 10V lower than normal, the direct amount of its