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故障现象:一台牡丹54C9彩电,光栅、伴音、频道显示均正常,但无图像。分析检修:该机遥控部分的开/关机和开关电源的稳压过程,均通过一个光电耦合器电路进行隔离控制。在开关变压器次级输出的5组电压中,B1(130V)为整机行输出级供电电源;B2(22V)为伴音通道供电电源;B3(180V)为三基色矩阵输出管集电极和显像管阴极供电电源;B4(24V)为行激励、场输出集成电路供电电源;B6(l2V)为信号通道集成电路及晶体三
Symptoms: a Peony 54C9 color TV, grating, sound, channel display are normal, but no image. Analysis and maintenance: The aircraft remote control part of the on / off and switching power supply regulator process, are through a photocoupler circuit isolation control. B1 (130V) is the output stage power supply of the whole machine; B2 (22V) is the audio channel power supply; B3 (180V) is the output of the three primary color matrix tube and the cathode of CRT Power supply; B4 (24V) for the line incentive, field output integrated circuit power supply; B6 (l2V) for the signal path IC and crystal three