Hello all. I have a strange problem that appears on my Demo man pinball. I replaced the ROM from Px-3 version to Lx-4. Then the game does not want to boot... I have the 2 leds at D19 and D21 working continuous on. The strangest thing is that this only appear if I put the backglass on. if i take out the backglass and open the panel to the backbox, the game boots like it should. I replaced all ribbons with working ones from another game but I still get the same thing. Anyone have any ideas of what to try next? This is the first time that I replace the software but the chip have the notch on the right side, I even reinstalled it.... no bent pins.. but still the same problem. Probably it is just a simple fix but clearly it is above my level. Thanks for the help.

after another 30 tries I got the same error once with the backpanel door open. also i am almost sure that i got the same error once or twice with the old ROM... I thought the fuse from the video board was blown but the fuse was good and now when I did some more thinking I think the game was actually not booting (I did not looked for D20 then), so this is good news and I hope the new ROM is good.

I replaced the CPU board with another one from Fish tales and I still have the same problem. Also from the sticker I have on my board found in my Demo man I see it is a board pulled out from Getaway High speed II.

The strange error become even stranger. even if i let the door open it will not boot if the room is dark. It only start if the light reach the cpu board. I tried the reverse thing like turnong the game on with the backpanel door close but I have the light from a flashlight in the backbox and the game boots now. What the heck is that? I never red anywhere about something like this. It is not a coincidence since it happens all the time. i did more than 100 tries. Can this be a fault chip for the new software? All i hear when I start the game is a bong and D19 and D21 are continuously on.

I put the old software back and now it boots every time. Probably a problem with my new software Lx-4. Is there any special procedure when replacing the ROM? I replace it twice, once with batteries in the game and once with batteries out and still the same problem with non booting. Do I need to change something else like taking the processor out and put it back again or is there any other button to push when changing ROMs?

Thanks for your answers. i will order a new lx-4 ROM.