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彩电中的行逆程脉冲信号通常是由行输出回扫变压器引出后,送到主芯片内部的行振荡信号电路,起到校正相位的作用,通过内部电路确定扫描显示位置。另外,行逆程脉冲还经整流、滤波后,产生“二次”电源电压,供“场块”、末级视放等工作电压。此电路往往被维修人员不太注意或忽略。本人碰到三例均是由于行逆程脉冲信号相关电路异常所造成的疑难故障。
The color TV back row pulse signal is usually taken out by the line output flyback transformer, sent to the main chip internal oscillation signal circuit, played a role in correcting the phase, through the internal circuit to determine the scan display position. In addition, the line counter-pulse is also rectified, filtered, resulting in “secondary ” power supply voltage for “field block ”, the final level and other operating voltage. This circuit is often not paid much attention or neglected by service personnel. I have encountered three cases are due to reverse pulse signal related circuit abnormalities caused by difficult problems.