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例1 三洋CTP4940-00型47cm彩电。故障现象:光栅正常,荧屏上有噪点,但无图像无伴音。分析检修:根据现象,故障部位应在视频检波以前的电路中,一般以高频调谐器的可能性最大。该机型采用三洋公司的83P系列机芯(俗称Mμ两片机),用一块日本三菱公司生产的M51354AP集成块完成图像及伴音信号的处理,分别从(29)脚和(17)脚输出视频及音频信号。接通电源,用镊子接触电视信号输入脚⑧,屏幕有反映,喇叭有噪声;再用镊子跟踪触动高频调谐器IF输出端子,荧屏也有反映,说明故障部位在高频调谐器及节目预选器部分。用三用表测量高频调谐器调谐电压T、输入端子电压,电表指示为
Example 1 Sanyo CTP4940-00 47cm color TV. Symptoms: grating normal, noisy screen, but no image without sound. Analysis and maintenance: According to the phenomenon, the fault location should be in the video before the detection circuit, the general possibility of the highest frequency tuner. The model uses Sanyo’s 83P series of movement (commonly known as Mμ two-chip machine), with a piece of Japan MITSUBISHI M51354AP integrated block to complete the image and sound signal processing, respectively, from (29) and (17) feet output video And audio signal. Turn on the power, with tweezers touch the TV signal input pin ⑧, the screen is reflected, the speaker is noisy; then tweezers tracking touch IF tuner IF output terminal, the screen is also reflected, indicating the fault in the high-frequency tuner and program preselector section. Measure the high frequency tuner tuning voltage T with the three-purpose watch, input the terminal voltage, the electric meter is indicated as