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故障现象:德律风根6016型彩电,图像正常,但无伴音,将音量电位器调到最大时,扬声器才能发出极轻微的“沙沙”声。分析检修:根据上述现象分析,伴音功放部分出现问题的可能性较大,首先测量功放集成块IC412(TDA1908A)的各脚电压均正常,检查外围元件也无问题。故怀疑伴音中放电路有故障。测量伴音中频放大电路IC411(TBA120T)的各脚电
Symptom: Telefunken root 6016 TV, the image is normal, but no sound, the volume potentiometer adjusted to maximum, the speaker can send a very slight “rustling” sound. Analysis and maintenance: According to the above analysis, the sound power amplifier part of the possibility of a larger problem, first measure the power amplifier IC412 (TDA1908A) each pin voltage are normal, check the external components without problems. Therefore, it is suspected that there is a faulty discharge circuit in the accompanying sound. Measurement of audio IF amplifier circuit IC411 (TBA120T) of the foot