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故障现象:开机呈“蓝屏静噪”,无电台,转换到AV状态,用VCD机视频输入信号时,有轻微伴音,仍为“蓝屏”。在AV状态关机,再开机,视频输入图、声正常,再转换到TV,“蓝屏”(AV蓝屏)。经多次试验,只有在AV状态关机,由AV端子输入信号,再开机时图、声正常。分析与检修:该机为飞利蒲OM8361单片机芯彩电,初步分析,可能是AV/TV转换电路故障,将OM8361(16)脚在0V/8V(TV/AV)状态转换,无效,查AV/TV转换集成电路LC4053及外围输入/输出/控制元件,未发现异常,说明AV/TV切换电路无故障。
Symptom: boot was “blue screen squelch,” no radio, to AV state, VCD video input signal, there is a slight sound, still “blue screen.” Turn off the AV state, then boot, video input map, sound normal, and then switch to TV, “blue screen” (AV blue screen). After many tests, only in the AV state off, the input signal from the AV terminal, then turn the picture, the sound is normal. Analysis and Maintenance: This machine is Philips OM8361 monolithic movement of color TV, a preliminary analysis, may be AV / TV conversion circuit failure, the OM8361 (16) feet in the 0V / 8V (TV / AV) TV converter IC LC4053 and peripheral input / output / control components, found no exception, indicating AV / TV switching circuit without failure.