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一台索尼KP—7220CH投影电视机图象颜色偏青,亮度失控,且图象上有回扫线,伴音正常。一、故障分析将色饱和度旋钮调到最小,看其能否呈现正常的黑白图象,发现该机颜色仍偏青。由三基色原理可知:红+绿+蓝=紫;绿+蓝=青。显然颜色偏青是因为缺少红色成分。观察红色、绿色、蓝色投影管表面,发现红管亮度比绿管、蓝管亮度低。在正常情况下,绿管最亮,红管次之,蓝管最弱,三者亮度比约为3(R):6(G):1(B)。结合亮度失控的现
A Sony KP-7220CH projection TV image partial color green, the brightness out of control, and the image has a retrace line, sound normal. First, failure analysis Turn the color saturation knob to the minimum, to see if it can show the normal black and white images and found the machine is still partial green color. By the principle of three primary colors we can see: red + green + blue = purple; green + blue = blue. Obviously the color is too green because of the lack of red ingredients. Observation of red, green, blue projection tube surface, red tube brightness than the green tube, blue tube brightness is low. Under normal conditions, the green tube is the brightest, the red tube is the second, the blue tube is the weakest, and the brightness ratio of the three is about 3 (R): 6 (G): 1 (B). The combination of brightness out of control now