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机型:北京牌837型35cm彩电。 故障现象:伴音正常,调至有节目频道时光栅极暗,无节目频道光栅亮度接近正常,但无雪花噪点,图像清晰度极差,仅能看到人物轮廓,光栅亮度时明时暗地变化。调色度旋钮时,色彩正常;旋动对比度、亮度旋钮,黑白对比度及光栅亮度均有明显变化。 检修过程:据伴音、图像、色彩、光栅的情况,说明本机行场扫描、解码等相关电路工作是正常的,聚焦电路发生故障的可能性较大。首先测聚焦电压值
Model: Beijing card 837 35cm color TV. Symptoms: normal sound, transferred to a program channel when the raster is dark, no program channel raster brightness close to normal, but no snow noise, poor image clarity, only to see the person profile, the brightness of the light when the light and dark . Color knob, the color is normal; rotary contrast, brightness knob, black and white contrast and grating brightness have significant changes. Maintenance process: According to the sound, image, color, grating, indicating that the local field scanning, decoding and other related circuit work is normal, focusing circuit is more likely to break down. First measure the focus voltage value