New to the club and have done several fixes, but I have a couple of lighting questions that hopefully someone can point me in the right direction. The GI lights when the game is powered up, but then turns off for the opening sequence and stays off for the rest of the game. Also, the T-REX lights in the apron never light. The issues may be linked or separate, any help would be appreciated. I’m on page 35 of this thread, so if this was covered later my apologies for the repeat.

Can anyone suggest some things to check when the trex stops chomping, it was working and then all of a sudden it isn’t. I’ve read a lot of threads, sounds like there could be a break in one of the wires under the sheath, anything else. As always, any help is appreciated.

I’ve now had the game for a few months and have it close to dialed in, using the knowledge in the thread for many of the fixes. Big thanks to the community. I have two things left, my gi relay goes closed as soon as you turn on the game and never turns back on. I currently have it unplugged. I swapped boards and the problem persisted, but at this point I feel like I’ve checked everything that controls this relay. Also, I have a really slow left/right movement in the trex. I’ve seen two other posts with this exact issue in this thread, but no one mentioned the solution if they found it.

Finally, I’ve caught up and read every post in this thread, but while doing so missed the last couple FS posts with the moving Tim’s Gate Mod. If anyone else has one they’d be willing to part with, I’d be happy to buy.

This is one of the examples of the slow left and right I’ve seen that went unanswered. It perfectly describes my issue, if anyone has any potential fixes.

After spending a lot of time repinning connectors and checking board components, I still couldn’t fix the GI relay. Despite not being listed on the website as a game it works on, i bout a GIzmo to try. It works great and my GI problem is solved. Wouldn’t be surprised if the LED OCD website just missed listing Jurassic Park, the other games manufactured around the same time were listed. I saw multiple posts in this thread asking if the GIzmo works in Jurassic Park, so thought I’d add a post confirming it does.

I do love the GIzmo on this game it lowers the brightness of the LEDs and makes the game much more enjoyable. It should be mentioned that after a few games working correctly the relay got stuck off again. I left the relay unplugged for some time and then when troubleshooting a start button that wouldn't work and repinning a connector on the cpu board I noticed a 7408 chip that had battery acid leaked onto it. When that chip was replaced my relay worked as well as some other problems being solved. Thought this update might help someone in the future.

Hoping all of you DE experts can point me in the right direction. I've had the machine since July, it took a bit to get it dialed in but it was playing really well. Recently it started having sporadic reset issues, which I thought might have been caused by having too many games on the same circuit, turning 2 of them off seemed to clear the issue. Then, the sound started going a little crazy and it would just play random noises at all points, it was not repeating the same effect just never playing the correct music/effect for what the game was doing. I've now also lost my display. Any ideas where to start looking. The game does seem to be playing correctly minus sound/display if that helps diagnose.

Thank you for the response. Fairly good at shopping/cleaning and mechanical problems. New to electrical, but you've given me somewhere to start.

I did test the power supply, 5V tested fine. 12V was just over 9. I think it’s a good assumption that is causing my problem, time for a recap or new power supply.

I’ve had enough problems with the power supply that I replaced it. The sound is back and the game now correctly goes through the trex diagnostics on startup. My display seemed dead, couldn’t get anything from it. I replaced it and now it will light up with the rom version at power up and then go dark. I’ve reseated every connection, any ideas?

I did buy the rottendog board. It seems to have fixed all the issues I was having except for the display. Voltages test well. I had a spare CPU board that I tried swapping in. I'm a little worried I damage one or more of the legs on the rom chip swapping it around. I have a new one on the way, so we'll see if that helps at all. I did do some forum searching and saw that as a fix for the same issue in a DE Star Wars.

I searched other threads, but they were kind of non specific and my efforts to troubleshoot so far have not fixed the issue. I can no longer enter initials for high scores, hitting the flipper buttons does not scroll letters. Has anyone else had this issue, any tips on how to fix?

I had read the first one but not the Tommy thread on rec.games.pin. I had done a switch test and while the flippers work they didn’t register in the switch test. I decided to check all of the connections and found the green wire with the grey strip was loose in the connector CN8. I fixed the connection and I’m back in business. This game gave me a bunch of problems, I went through a period where i was swapping in spare boards etc. before have Clive repair the original. I’m sure with all the plugging/unplugging the wire just got pulled loose. Alls well that ends well.

Looking for a little help. I want to replace my left/right trex motor. I lowered the Rex and took off the collar. Immediately, I found two screws securing two of the corners. For the life of me, I can’t find the other two. Do you have to completely remove the Rex from the game?

Really appreciate the reply, thanks.

I’m in for one.