Command BF Data East error

[robm]

In my Jurassic Park, when you turn the machine on, it starts up OK, CPU LEDs flash as they should, shows the normal machine info on the screen, then says "COMMAND BF", after that, the DMD stays off, yet game boots and plays as per normal....without a display.

What happened leading up to this:   I am helping a guy fix a WWF power supply board and have installed it a few times in JP - there was no 5V or 12 V, until i replaced fuse clips and ran a few jumper wires where holes had burnt in the board.  I am unsure if this affected anything, or the problem is elsewhere on my JP - just wanted to check things out before i took his WWF board back to him.

I am getting the correct voltages on CN6 (ie :-12, +12  , +5) - any ideas where to start - i have no other DE machines to swap things with.

Thanks

Rob

[Strangeways]

1. Check the display voltages
2. Check that the Display ROM is not loose. Sounds to me like you need to re seat the Display ROM, or it is the wrong version ?

[robm]

Will reseat and check voltages when I get home. Display rom is the correct one as ive had JP for years with no worries. It's only happened since i put the Wwf power supply board in (although JP prob hadn't been turned on for a couple of months prior)