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[例1]故障现象 从背面板视频/音频插口输入视频/音频信号,按下遥控器上“TRANS/AUX”钮,多功能显示屏显示AUX字符,临视器屏幕上彩色图像正常,但扬声器中无伴音信号。 分析与检修 根据从背面板视频/音频插口输入信号,监视器上有图无声这一现象,初步判断故障出在音频信号处理电路中。为了迅速确定故障存在的部位,可调谐电视节目,这时监视器屏幕上彩色图像和伴音信号均为正常,说明故障存在音频输入电路或LINE/TUNER输入选择电路中,该电路如附图所示。用500型万用表检查集成块IC402的①脚
[Example 1] Symptom Inputting video / audio signals from the back panel video / audio jack, press the “TRANS / AUX” button on the remote control, the multifunction display shows AUX characters, the color image on the monitor screen is normal, No audio signal. Analysis and Overhaul According to the signal input from the back panel video / audio jack, there is a picture on the monitor silent phenomenon, the initial judge fault is in the audio signal processing circuit. In order to quickly determine the location of the fault, you can tune the TV program, then the monitor screen color images and audio signals are normal, indicating the existence of audio input circuit fault or LINE / TUNER input selection circuit, the circuit shown in the figure . Use a 500 multimeter to check the IC402 IC block