“外接音频信号注入法”,就是将外部的音频信号源(如“随身听”耳机输出)加到故障机的有关部位,通过听取喇叭发音的情况并配合其他手段来判断故障部位的一种方法。笔者多年来的维修实践表明,这种方法比用镊子注入人体感应信号更为直观、有效。本文通过三个维修实例将此方法介绍给读者,供参考。例1 康佳T2519D彩电,有图像有彩色,无伴音。分析与检修:根据故障现象判断故障出在伴音电路(见图1)。该机伴音功放级采用两块相同的集成电路TDA7056B(元件标号为N201、N202),分别供给两路扬声器发声。TDA7056B的②脚为电源供电端;③脚为音频信号输入端;⑤脚为音量控制端;⑥、⑧脚为音频输出端。为快速判断故障范 “External audio signal injection method” is the external audio signal source (such as “Walkman” headphone output) to the relevant parts of the fault machine, by listening to the speaker pronunciation and other means to determine the failure of a method . The author’s maintenance practice over the years shows that this method is more intuitive and effective than using tweezers to inject human body sensing signals. This article introduces the method to the reader through three maintenance examples for reference. Example 1 Konka T2519D color TV, there are images with color, no sound. Analysis and Maintenance: According to the fault phenomenon to determine the fault in the sound circuit (see Figure 1). The machine sound power amplifier stage using two identical integrated circuits TDA7056B (component code for N201, N202), respectively, two-way speaker supply sound. TDA7056B ② feet for the power supply side; ③ feet for the audio signal input; ⑤ feet for the volume control side; ⑥, ⑧ feet for the audio output. To quickly determine the fault range