DL2 Repair Help

jgeiger

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Joined
Nov 22, 2010
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Location
Columbus, Ohio
Thanks to eyeless I just dropped a working 1450LDP in to my Dragons Lair 2 cabinet. Monitor works and if I just play the laserdisc you can see the setup screens and watch the intro animation. However, I cannot get the game to actually work. Here are some notes.

I put a new switching power supply from BR in it.
Monitor and LDP work fine.
Lights D1, D2, and D3 are lit.
LDP: Sony LDP-1450
Disc Rev: 10-227 C-910-00001-00
No beeps at startup.
The COMM lights never light up.
I continuity tested the null modem cable and made sure it was wired correctly.
I looked the board over for cracks, burns, etc. and its super clean.
When its powered on the game just sits on the title screen.
The service mode does not work (service button and P1).
I checked continuity on the controls and other wiring.

I also have a board and disc from the other revision that exhibit similar symptoms.

Any pointers would be really helpful. I cant seem to identify any test points on the board or in the schematics to try and diagnose what the problem might be. Ive also posted over at the dragons lair project on this but theres not a lot of traffic over there.

Thanks.
 
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