Hi jepoy + a very frazzled man thanks for your suggestions,here is how it went:-
I found a couple of these VM1710 boards and tried one and still nothing.
I really wanted to see if power was getting to the camera and anything coming out. I was looking for a lead to plug into the bnc connector on the camera (maybe this is video out?) and i found a lead with the same connectors as the original.
Plug this in ( from camera to VM board)and everything starts working!! the green screen monitor came on too. The phono lead plugged into this VM board goes to this monitor. The original Board was ok, plug in the original cable and it went again.
This reminds me of a post by Bert from New Zealand some time ago who had strange problems with the head stopping. You guys pointed out that the cables from the head get damaged after many years. So if there is any funny business concerning the placing head, go for the wiring loom!