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康佳T2530D型彩电,开机不到5 min(分钟),伴音消失。有时开机只有图像无伴音。经查为LA7688N④脚外接音频滤波电容C176漏电,导致音频增益下降,更换新品,故障排除。康佳T2910N型彩电,开机无光栅、无伴音,但电源指示灯亮。经查行输出电路来工作。检查推动管V401各级电压,测得集电极电压为0 V,异常。经查为电阻R406(4.1 kΩ/5 W)开路,更换之,故障排除。
Konka T2530D color TV, boot less than 5 min (minutes), sound disappeared. Sometimes only the image is switched on without sound. The investigation for LA7688N (4) foot external audio filter capacitor C176 leakage, resulting in decreased audio gain, replacement of new products, troubleshooting. Konka T2910N color TV, boot no grating, no sound, but the power indicator light. The investigation of the output circuit to work. Check to promote the voltage at all levels of V401 tube, the measured collector voltage is 0 V, anomalies. The resistance R406 (4.1 kΩ / 5 W) was opened, replaced, troubleshooting.