well, i spent a few hours on it yesterday, ripped everything out the back compartment, checked that the optical cables to the touch screen were oriented the correct way, they were, i checked the cables to the power supply plug to the screen against the picture of the pins, mine is the same plug but i have nowhere near as many wires and some are oriented differently to the diagram,
still only getting a signal in the back compartment if i fit the bypass plug to the touch screen, when i finish work today i am going to fit everything back into the rear compartment and with the bypass fitted to the touch screen i will check the optical supply to each module in the rear and see if something else in the system is faulty and possibly preventing the signal to pass the touch screen, i ran out of time yesterday, i did try it but didn't have anything connected to power, so guessing that is why the signal wouldn't pass certain modules, not sure if they need to be powered up to allow the signal to pass through it,