DM800HD - tuner not showing signal

Hi guys.

My 800HD turned itself off today. Swapped a power supply from android box and it started up fine, but no channels would load up. thought fw got corrupted and reflashed it. tried to scan for channels and nothing found. went into satfinder and it's not showing any signal. i've plugged in my old power supply and it booted fine on it now, but same thing with no signal. is that the tuner failed ? any thoughts ?

thanks

could well be do you have another to swap over ?