HELP - Dragon Miner blades not showing green leds ??

[bilabonic]

Hi All

Have two miners, and both had broke variable fans and one unit even had the blades comes loose as they had used the wrong size scres to secure the blade to the case (they used the smaller case cover screws !!).

Both the fans were the variable speed ones, so i first replaced them BUT still no green led or any power light on Raspberry Pi unit ?

I checked the pi units by powering via a micro usb 5v/Ethernet cable and they powered up fine and i could connect to them via ip address.

My only option then is that it MUST be the main PCB, i have been sent two of these and STILLhave no green led with EVERYTHING connected as it should -no greeen leds on blades, both fans running, no power to pi unit ??


Anyone got any ideas what is going on here, the blades are connected as standard to the correct ports on the main board ?

What conditions need to be made to get the green led  ?

Cheers
 

[1714718135]

1714718135

[1714718135]

1714718135

[bilabonic]

I have also just checked that each blade is getting 12v via the pci-e connector from psu and all if ok ??