| 故障表现为：不定时黑屏 检修分析：试机发现不定时出现黑屏，故障时测量主板供电插座P001的背光开关脚电压只有1.8V，顺路检测Q003/BT3904三极管C极1.8V，B极0V，怀疑三极管不良，更换后故障依旧，仔细查看外围电路发现Q003的C极没装偏置R039电阻，补上一只2.2K电阻后试机不再出现故障。 |
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