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该故障是行供电电源+B退耦电容失效引起的。当退耦电容失效后,行输出的干扰脉冲信号就会能反馈到电源输出端,由于电源误差放大器取样点在L876之后,这样就会使电源误差放大器受到影响,从而使输出电压不稳,出现图像闪动、伴音沙哑且时有时无故障现象。原文中提到“用一只1Ω/1W小电阻代换L876或把电源误差放大器取样点改在L876之前,故障排
This fault is caused by the failure of the line supply + B decoupling capacitors. When the decoupling capacitor fails, the output of the interference pulse signal will be fed back to the power output, the power supply error amplifier sampling point after L876, so that the power supply error amplifier will be affected, so that the output voltage instability, there The image flashes, the sound is hoarse and sometimes no problems. The original reference to "replace with a small resistance of 1Ω / 1W L876 or change the power supply error amplifier sampling point before L876, fault row