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采用日立 NP82C、东芝Ⅲ、M11型机芯的进口、国产彩电约90余种,它们都采用自激一行同步式串联输出型开关电源电路,行扫描电路与开关电源互相影响,检修时应引起重视。对非行频同步开关电源来说,当行扫描电路出现行电流大故障时,开关电源因负载加重其输出电压+B 要降低。检修时,我们往往去掉行负载,接入假负载后,电源将会恢复正常,据此可以判断出故障究竟是在开关电源部分还是在行扫描部分。但是,对于行频同步开关电源则
The use of Hitachi NP82C, Toshiba Ⅲ, M11-type movement imported, about 90 kinds of domestic color TV, they are using a self-excited synchronous output in series switching power supply circuit, scanning circuit and switching power supply mutual influence, maintenance should pay attention . For non-line-frequency synchronous switching power supply, when the line scan circuit appears a large current fault, the switching power supply due to the load to increase its output voltage + B to be reduced. Overhaul, we often remove the line load, access to fake load, the power will return to normal, which can determine whether the fault in the switching power supply section or in the line scan section. However, for the line frequency synchronous switching power supply then