Hi All -

I'm new to this website and pretty new to repairing/troubleshooting machines. I have a STTNG machine that just stopped fully functioning. When powered on, I get a single audio bong and the playfield lights seem to function normally. The DMD is blank, the game won't start and the turrets don't return to home position. I checked the fuses and all look good. I also replaced the batteries.

Any insight or where I could go for help on this?

Thanks in advance!

Thank you LTG. I pulled 24 fuses and they all checked using my meter.

When I reseated them and powered on the machine, after the bong sound it made the noise like the system was in "test mode". I opened the coin door, pressed escape button and then the start button lit. Closed the door and pressed start button and the game tried to get going, but the gun turrets kept spinning and never found home. Still no display. Upon power cycle, the same behavior occurs. It seems to go into test mode again.

Thank you Chris. The LEDs visually match the normal state (except LED3). I haven't run a voltage check yet, but I will do that tomorrow. Very helpful link.