We found that the display will no output sometimes when power on. and even if power off and then power on. the display is same. but if we press reset button 5s and provide POR 5s input. the display will back to normal.
We can accept if the display can back to normal with some method. our question is why it can be recovered by press reset button 5s, the reset button connect i.MX6 POR pad and also PMIC reset output.