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例8故障现象:声音不良。分析与检修:首先开机测试,在PVR功能模式下,声音不良,转换测试USB和其他的信号测试,声音都没有问题,说明问题在PVR功能模块。于是检测PVR功能中的音频信号的处理流程。我们知道,在PVR功能模式下,从数字板输出的音频信号首先要经过U13的A/D信号转换后送到U16进行数字信号的格式处理,然后送到U6。首先测试U13的模拟音频信号的输入1脚、5脚的波形,正常。于是测试U13的输出波
Example 8 Symptoms: bad sound. Analysis and Overhaul: The first boot test, PVR function mode, bad sound, conversion test USB and other signal tests, the sound is no problem, indicating the problem in the PVR function module. The process of detecting the audio signal in the PVR function is then checked. We know that in the PVR function mode, the audio signal output from the digital board is first sent to U16 for digital signal format conversion after being A / D converted by U13 and then sent to U6. First test U13 analog audio signal input pin 1, pin 5 of the waveform, normal. Then test the output wave of U13