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(2)解除保护测量输出电压由于开关电源初级保护电路启动,造成开关电源无电压输出,致使微处理器N801的輯訛輨脚,检测到无电压,会同时引起微处理器同时进入保护状态。检修时可采用上述解除保护的方法,将开/关机三极管V661基极对地短路,进行开机试验。如果解除保护后,仍无电压输出,则是开关电源初级振荡故障或保护电路启动。三、电源与保护电路维修实例[例1]海尔HS—2558D彩电,开机时指示灯由红色变为黄色,几秒后,变为红色。分析与检修:开机测量电源+B电压,开机的瞬间
(2) Unprotected measuring output voltage Since the primary protection circuit of switching power supply is activated, there is no voltage output of the switching power supply, resulting in the failure of the microprocessor N801 to detect no voltage and cause the microprocessor to enter the protection state at the same time. Overhaul can be used when the method of lifting the protection, the on / off transistor V661 base to ground short circuit, the boot test. If the release of protection, there is no voltage output, it is switching power supply primary oscillation failure or protection circuit starts. Third, the power supply and protection circuit repair example [Example 1] Haier HS-2558D color TV, boot light from red to yellow, a few seconds later, turn red. Analysis and overhaul: power measurement of power + B voltage, boot moment