故障现象：开机后电源指示灯不断闪烁，屏幕无显示。检修过程：由故障可见显示器处于保护状态，电源部分无问题。故障出在负载部分。打开机盖，测行输出管Ｑ５０３的ｅ－ｃ极被击穿，由于引起行管击穿的原因较多，须检查外围电路。焊下阻尼管Ｄ５０７、逆程电容Ｃ６３８、Ｃ６ Symptom: After the power is turned on, the power indicator keeps flashing and no screen is displayed. Maintenance process: The display is protected by the fault and the power supply has no problem. The fault is in the load section. When the cover is opened, the e-c pole of the output line of the measuring line Q503 is broken down. Because there are many causes of breakdown of the line pipe, peripheral circuits must be inspected. Welding under the damping tube D507, the reversal capacitance C638, C6