Hello @xiangjun_rong, tried the ways you mentioned, but still facing the same issue
Answering the Questions u have asked
1)I have been using this board for quite a long time, more than a year now
2)I don't suspect any issue with the LPC55S16JBD100 as the board is still having the power confirmed with the LED and also the logs are been seen from the previous built, we had flashed previously
3)As u mentioned there can be power issue, but according to my understanding power issue is been is there on the debugger as there is no power led on, if possible can u share me the pin out for the MCU-Link debug probe to provide external power source and check with it
Thanks,
regards