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采用日立NP82C、东芝Ⅲ、松下M11、日立CPT2177型机芯的彩电,都是采用行频同步式开关电源电路,行扫描电路与开关电源互相影响,检修时应特别注意。对于采用非行频同步式开关电源的彩电,检修时往往去掉行负载,接入假负载后,看电源是否恢复正常,来判断故障是在开关电源部分还是行扫描部分。而对于采用行频同步式开关电源的彩电,这样判断就会带来一些问题。1.日立NP82C机芯开关电源此类开关电源,当行扫描电路出现行电流增大故障时,通电会发出“吱”的一声,并出现“三无”现象。去掉行
The use of Hitachi NP82C, Toshiba Ⅲ, Panasonic M11, Hitachi CPT2177 type movement of the color TV, are using the line frequency synchronous switching power supply circuit, scanning circuit and switching power supply mutual influence, maintenance should pay special attention. For non-line-frequency synchronous switching power supply color TV, maintenance often remove the line load, access to the false load, see if the power is back to normal, to determine the fault in the switching power supply section or the line scan section. For the use of line frequency synchronous switching power supply color TV, this judge will bring some problems. 1. Hitachi NP82C core switching power supply switching power supply of this type, when the row scan circuit line current increases fault occurs, the power will be issued a “squeak” and “three no” phenomenon. Remove the line