This was the last test on the hard drive.
Today i got the replacement network resistor.
I replaced it with the origional but there is still a 5 volt short at the power connector.
The problem must be further down the line.
here are 2 pictures of the controller board
I dont know how to test any of the components for failure.
I have cleaned this board very well since these pictures were taken. There are 2 fine green wires running between chips, I have 'raised' them clear of components to check for shorts - none
Have gone over the board very carefully with magnifying glass both sides , cant see any obvious problems.
There are allot of 74 logic chips and I do have chips of the same value. I can safely remove chips and replace with new ones without damaging the board.
Just have no idea where to start from here