Hello, I'm observing a strange behavior. If I connect the Tinkerboard to HDMI, it won't start. Only the red led LED lights up. Yellow and green did not light up. The Tinkerboard ist connected to a NorthPada 5V 3A Micro USB Charger power supply. I measured the supply voltage with 5.3V and checked with an oscilloscope if there are voltage dips. But the voltage was stable. I did a cross test. I unplugged the HDMI cable and started the Tinkerboard. The Tinkerboard starts and the yellow and green