Hoping someone can help .
On start everything else lights up , display works perfect , and games appears ready to start as normal.
My STTNG machine is coming up on startup as " Gnd Short Row 1 is stuck closed ", it then proceeds to shoot 3 balls into the ball lane , and then one of the two cannon mechs will randomly start to rotate and then return to the wrong position.
Another problem I now find is that the control buttons inside the key door don't respond at all,so cant go to any menus etc . and the start button will not start game - no response at all either.
I notice that the board inside the back box on the left had the red light at D19 was OFF , The red light at D20 was blinking on and off and the red light at I presume would be D21 was on solid red continually.
Of course as is the usual story with everyone - everything before this happened the machine was working perfect.
I am a novice of the highest order so any simple instructions/ photos on what I can do or places to check etc would be of great assistance and thanks to anyone in advance .