Sir. this is my hantek dso2d15 problem. actually, what happens is that there is no signal wave displayed when starting the power button is pressed then the logo appears and then loads the hardware but the keyboard led panel does not flip or blinked while the screen is already displaying the scope background without a signal.. my question is whether this can be caused by the power supply which is lacking or the front keyoard keyboard is damaged or the main motherboard is damaged. I tried to contact Hantek, only given the final solution to replace the motherboard at a price of 2000 yuan and excluding postage. I was confused about what error at first I just tried to calibrate then after rebooting suddenly there was no signal wave. I've tried flashing the firmware with the platform tool(platform-tools-(FW3000,FW3101,FW3102), it doesn't change anything, it's still the same, there is no wave signal. Sir, are you willing to answer, thank's very much.