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彩电主电源电压下降会导致无光。引起电源电压下降原因很多,通常是由电源本身或行扫描电路故障引起的。由于行扫描电路工作电压高、电流大、频率高,故障概率大,本文仅讨论由行扫描电路故障引起的主电源电压下降的检修方法。主电源电压下降通常系因行扫描电路直流短路或交流短路引起,检修时应先分清属于哪种原因,确定故障范围。这里介绍“短路检查方法”,即将行激励管基极和发射极短路。大家知道,行激励管、行输出管工作在开天脉冲状态,由行振荡级产生的行频脉冲信号推动,我们只要将行激励管基极(b)和发射极(e)用导线短路(对前级是安全的),这时行激励信号被短路,行电路短路点之后处于静态(直流工作状态),行激励管
Color TV main power supply voltage drop will lead to dull. Cause the power supply voltage drop for many reasons, usually caused by the power supply itself or line scan circuit failure. Due to the high scanning line voltage, current, high frequency, the probability of failure, this article discusses only by the line scan circuit failure caused by the main power supply voltage drop overhaul. The main power supply voltage drop is usually caused by the line scan circuit DC short circuit or AC short circuit, maintenance should first distinguish which one belongs to the category, to determine the fault range. Here is the introduction of “short-circuit inspection method”, is about to stimulate the base tube and emitter short circuit. As we all know, line excitation tube, line output tube work in the open pulse state, the row oscillation level generated by the line frequency pulse signal to promote, we just line excitation tube base (b) and emitter (e) with a wire short circuit On the front is safe), then the line excitation signal is short-circuited, after the circuit short circuit point in a static state (DC working state), the line excitation tube