TI授权代理处购买的LM211P 机焊 出现发热现象 更换后（手焊）整个电子板功能正常. 测试合格的100块板，不通电放在老化箱中，60度老化8小时。又出现3块板功能不正常。表现为发热，7脚电压1V左右（正常的板子不会发热，7脚电压17.5V）。测试环境室温20度。帮分析是可能什么原因导致出现不良现象,谢谢~
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