一台“海燕”牌37cm 彩电,图像缺红色,行幅略大,亮度略低,但不明显,伴音正常.测视放板各点电压,均在正常范围,反复调黑白平衡无效。测解码块 TA7193各脚电压均正常,唯4脚无负压,表明无行逆程脉冲,有关电路如附图,沿行逆程通路逐点测量,一直到 C_(516)上端亦无负压,取下 C_(516)发现短路,换一新电容,故障排除。 A “Swallow ” brand 37cm color TV, the lack of red image, the line width slightly larger, slightly lower brightness, but not obvious, normal sound. Plane voltage at all points, are in the normal range, repeated black and white balance is invalid. Test code block TA7193 each pin voltage is normal, only 4 feet no negative pressure, indicating no reverse pulse, the circuit shown in the drawings, along the retrograde path by point measurement, until the C_ (516) No negative pressure on the top , Remove C_ (516) found short circuit, change a new capacitor, troubleshooting.