15.4.26 Wildfire stm32 Development Board damage repair record

This time in the processing of the board problem has made several mistakes. 1, although VCC and GND are short, the first reaction is to recall what operation caused the accident, in order to determine where the problem. 2, although the problem is located in the chip by electrostatic breakdown, but the removable chip did not go to confirm the error, (which caused a series of subsequent problems) 3. After the change of the film, found VCC and GND or short, began to see if the sweat is a component burn or filter capacitance breakdown problems. Here in addition to the second part of the flaw, the other troubleshooting steps are understandable, but the key is that in the event of the use of the device, and all the filter capacitors are removed, the short-term situation is still unresolved. 4. The only thing left to replace the film is the possibility of a bad one. 5, the film blown down, found that the short-term situation disappeared. The problem is solved by changing the film again.

Bring Me the following lessons: 1, to deal with the problem to be rigorous, not afraid of trouble, trouble do not engage in scientific research.

2, small probability event, small probability event only represents the likelihood of occurrence of small, does not mean that does not happen.

3, do not casually hand to the live chip or IO mouth touch.

15.4.26 Wildfire stm32 Development Board damage repair record