Would this be with the ribbon cable disconnected between the main board and
the PSU board?

If so which end should I measure?

"Uffe Bærentsen" wrote in message
k...

"Stephen" skrev i en meddelelse
o.uk...

Probing for grounds and voltages gives me on both units:

Pin number Good unit 2 Bad Units
pin 1 ground ground (this has zero
resistance to the metal case)
pin 2 ground ground (this has zero
resistance to the metal case)
pin 3 -3.42v 0.4v
pin 4 0v 12.85v
pin 5 8.73v 0.76v
pin 6 18.32v 7.4v
pin 7 0v 8.8v
pin 8 0v 8.5v

What is these resistances:
pin 1 to pin 2
pin 1 to pin 4
pin 1 to pin 7
pin 1 to pin 8

I think you have an issue with the ground/0V.



--
Uffe Bærentsen