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1.一台夏普C—1803DK彩电不定期出现“三无”故障。首先测开关电源输出+B电压正常,再测行管基极电压为零(正常值为-0.12V),说明行管基极无行频脉冲输入而使行扫描电路未工作。逐级检查发现推动管集电极电压为零。检查该管集电极负载电阻,其焊点断裂,焊好后故障排除。
1. A Sharp C-1803DK color TV from time to time “three no” fault. First test the switch power supply output + B voltage is normal, and then test the line control base voltage is zero (normal value -0.12V), indicating that the line control without row pulse frequency input line scan circuit does not work. Step by step inspection found to promote the tube collector voltage is zero. Check the tube collector load resistance, the solder joint fracture, welding after troubleshooting.