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LM211P不良原因

 LM211P 机焊 出现发热现象   更换后(手焊)整个电子板功能正常。有100快板测试合格,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。