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昨天还能下载程序，今天上午就不能用了，而且之前插上电脑时usb模块特别烫手，求指教
查一下是否有短路
我觉得也是，但我用的launch pad,上面的芯片全是贴片的，会短路吗
刚才测了一下，用usb供电时，上面有一个稳压芯片vcc是4.5v,但是电路要求是3.6v，之前有一次不小心烫到芯片，留了个小疤，会不会烫坏了
