Update on Beosystem 2 display output: items 1, 3 & 4 of top questions are correct, thanks to Kurt for saving me hours of trial & error & avoiding risking damage. Thanks to Stefan for getting me going in the first place.
Item 2, my question regarding RGB pinouts is not correct, i was reading a service schematic for older BS sockets. Can confirm VGA output to BS2 MKIII is standard pinout configuration and works fine on a CTX branded CRT monitor (50Hz).
Ralf, i am going to use a Samsung 46" LED display for HDMI connection from SKY, taking audio from SKY via the BS2 to drive a pair of 6000's and a Beolab 2. Driving the speakers is the only reason i want the BS2.
I am only using the CTX CRT monitor to access menus, have made a BD9 plug with pins 2 & 3 linked to trick the BS2 into thinking a "proper" display is connected, otherwise it just shuts down. If the Samsung LED will display from the BS2 (it shows a listing for 50Hz) then of course i would connect the vga to the TV for use when programming menu options. I am not expecting the VGA output / input to be as good as a HDMI cable direct from the SKY box, but i'll try it anyway.
I also needed the BS2 to act as the main or slave unit in place of an Avant, giving the RF out to distribute as the Avant does now. All this is to save the cost of another £10 / month subscription to SKY for a mirror card (and the cost of another SKY box)
I now have a sound problem and have started another thread "BS2 speaker setup" Please help, i hope this is the last of my troubles with the BS2 - something is fishy about this - when i finally got the display working it asked for a PIN code. I rang B&O for a master code to re-set the user code and was told no chance. BTW, the master code and the change PIN code menu options do not come up, is that a fault or.....?
I contacted the seller for the code, expecting no joy. He turned out to be a third party, not the original or registered owner. He asked me for the serial number and 90 mins later he told me the PIN code, it worked. He said he had simply rang a B&O shop who told him the code!