m_mcgovern
Active member
[cross-posted from r.g.p]
I am getting sooo close to my BTTF working again.
Game was working fine (except for one playfield switch and a ton of #89 flasher lamps and #47 lamps, mostly in the backbox).
I replaced all of the bad lamps...now the game won't boot!
I get the normal Data East LED boot sequence:
- PIA / +5V LEDs turn on immediately
- PIA LED turns off
- Blanking LED turns on next
- A fast voice sample is played ("Back to the Future")
After the LED sequence/voice sample, I do not get any message on the display, nor does the playfield/backbox attract mode light show start. I cannot coin up a game, nor advance out of test mode (so it is not just the display being out, although if that were the case, I would expect the light show to be running)
I've re-checked my coils and none are shorted. I have 4.9V on the 5V test point when measuring to the right of the batteries.
Could the extra lights be drawing too much current and creating a problem at the CPU board? What else could it be?
Any help is greatly appreciated. I thought once I got the lamps in place I would be 98% there, but now it feels like I've taken 5 steps back!!
I am getting sooo close to my BTTF working again.
Game was working fine (except for one playfield switch and a ton of #89 flasher lamps and #47 lamps, mostly in the backbox).
I replaced all of the bad lamps...now the game won't boot!
I get the normal Data East LED boot sequence:
- PIA / +5V LEDs turn on immediately
- PIA LED turns off
- Blanking LED turns on next
- A fast voice sample is played ("Back to the Future")
After the LED sequence/voice sample, I do not get any message on the display, nor does the playfield/backbox attract mode light show start. I cannot coin up a game, nor advance out of test mode (so it is not just the display being out, although if that were the case, I would expect the light show to be running)
I've re-checked my coils and none are shorted. I have 4.9V on the 5V test point when measuring to the right of the batteries.
Could the extra lights be drawing too much current and creating a problem at the CPU board? What else could it be?
Any help is greatly appreciated. I thought once I got the lamps in place I would be 98% there, but now it feels like I've taken 5 steps back!!