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型号:金凤牌47S2A型彩电。故障现象:屏幕上无彩色。故障分析:该机是松下M11五片机。色度信号处理由AN5622和AN5612两块集成电路组成。AN5612为色差矩阵电路,AN5622为色信号处理电路。故障检修:先检测AN5622各脚电压,其余脚电压正常,仅②、⑤、⑥脚均为2V,正常值分别为4V、7.4V、7.3V。分别检查这三个脚外围元件,没发现问题。更换AN5622,图像仍无彩色。证明解码电路未损坏。查其余各脚外围元件未见异常。能后检测AN5612各脚电压,除③脚电压为7V(正常为10V)外,其余各脚电压均正常。查③脚外围元件C_(305)(1μF/50V),用一新品更换,图像仍无彩色。当
Model: Jinfeng brand 47S2A color TV. Symptom: no color on the screen. Failure Analysis: This machine is Panasonic M11 five machine. Chrominance signal processing consists of two integrated circuits AN5622 and AN5612. AN5612 color difference matrix circuit, AN5622 color signal processing circuit. Troubleshooting: First test AN5622 voltage of each pin, the remaining pin voltage is normal, only ②, ⑤, ⑥ feet are 2V, normal values were 4V, 7.4V, 7.3V. Check these three foot peripheral components, did not find the problem. Replace the AN5622, the image is still no color. Proved decoding circuit is not damaged. Check the remaining peripheral components of the foot no exception. After the test AN5612 voltage of each pin, except ③ pin voltage of 7V (normal 10V), the rest of the voltage of the pin are normal. Check pin ③ peripheral components C_ (305) (1μF / 50V), with a new replacement, the image is still no color. when