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(2)也可将IC300的輮訛輩脚外部的电阻R341右端接地,强行将輮訛輩脚的电压拉到低电平,解除保护,观察故障现象。如果将电阻R341右端接地后,不再出现“三无”故障,则是保护电路启动,进入保护状态所致;如果将电阻R341右端接地后,仍然出现“三无”故障,则是开关电源和行扫描电路故障。为了整机电路安全,解除保护前,应确定开关电源输出电压正常,行输出电路无明显短路故障,然后再采
(2) It is also possible to ground the right end of the external resistor R341 of the IC300 to the ground, forcibly turn the voltage of the generation foot to a low level, to release the protection and to observe the failure phenomenon. If the right end of the resistor R341 grounding, no longer appear “three no ” fault, the protection circuit is activated, into the protected state; if the right end of the resistor R341 grounding, there are still “three no ” fault, then Switching power supply and the line scan circuit failure. In order to the whole circuit safety, before lifting the protection, should confirm that the switching power supply output voltage is normal, the line output circuit has not obvious short circuit breakdown,