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十六、彩电开关电源疑难故障检修5例例一机型:日立CTP2150型彩电故障现象:有图像时光栅上部压缩分析检修:该机采用日立G7PN机芯。按照常理分析,上线性不良重点检查场输出电路。检测场输出厚膜电路μPC1378H时发现⑥脚的供电电压只有23V,较正常值低3V。场输出电路的供电电压由行输出变压器提供,查26V脉冲整流滤波电路中的各元件正常。测行管的集电极电压比正常值低10V,而行电流330mA基本正常。
Sixteen, color TV switching power supply troubleshooting a case of a failure of a model: Hitachi CTP2150 color TV Fault phenomenon: the upper grating when the image compression analysis and maintenance: The machine uses the Hitachi G7PN movement. In accordance with common sense analysis, check the linear field of poor output field output circuit. Detection field output thick film circuit μPC1378H found ⑥ foot supply voltage is only 23V, lower than the normal 3V. The output voltage of the field output circuit provided by the line output transformer, check 26V pulse rectifier filter circuit of the normal components. The test tube collector voltage is lower than the normal 10V, while the line current 330mA basically normal.