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Echostar Ad-3000ip Fault

Can anyone please help.

I'm an engineer but I'm totally new to the satellite world. I currently have an Echostar AD-3000IP receiver to repair, but no circuit diagrams, or any real idea of whats what.

The fault appears to be on the power supply board. When power applied the display flashes off and on (All segments illuminated), whilst a loud fast clicking can be heard.

Has anyone experienced this fault before? Any suggestions gratefully appreciated.