Any help or direction is greatly appreciated!!! I recently bought and replaced the PF in my ST:TNG. (looks great!) I fired it up and it posted a few shorts. It was then in the attract mode and seemed stable. I was in awe of the new PF and LED's and literally stared at it for a long three minutes. Then it went down. So now, when attempting to turn on the game, it blows the Power Driver Board fuse 114. I have disconnected almost everything from under the PF and even tried to boot with different things disconnected from the PDB...solenoid connections, High power / low power... So I'm suspecting that one of the original shorts caused something on the PDB to fry and the result is the fuse 114 blowing every time... My issue, A) I'm not sure where to start diagnosing the board and B) I can't get back to the Error log to see the short call outs. Stuck! I have a WMS IJ with the same Power Driver Board but I'm not willing to be totally without Pinball if both board fry...

Again, any starting point would be great!

Thanks!
Brad

Thanks ZAZA! I couldn't wait to get home at lunch. (HA) I had it wrong, it was fuse 113. Same result though, I completed the four measurements as you described and they each were close to 0.50 mV's. Looks like I start by replacing the bridge rectifiers?

Brad

I appreciate you sticking with me! OK, how do I check BR2? It was definitely Fuse 113!

Got it... Thank you!

Thanks ZAZA! The fun continues! SO, using your instructions and my WMS IJ as a comparison, I did indeed find that BR2 was faulty. I ordered / installed and verified correct voltages! Awesome right... So now, Fuse 103 is blowing immediately. Looking at the manual, page 49, it shows solenoids 24-28. Looking at the solenoid / flasher table, it's drive cable 107-6 (Red / white stripe) Am I correct in thinking that it could be anything connected to that Red / White wire? I've checked the soldered connections to all the flashers, even unplugged the Borg ship. Still blows.
Has anybody ever seen a flasher socket itself short out before? I can't find any connection issues and there aren't any diodes to check... Are there other Driver Board voltages I should be checking for?

Any further assistance / direction is greatly appreciated!! I'm having a family party in two weeks and would love to have both Pins up an running.
Thank You!
Brad

Morning bump, sorry! (no shame - I honestly can't wait to play it again!) Any help or advice is appreciated!!

No love today OK so maybe a more general question. For me to rule out each flasher, how can I test for a short? You have the power conductor, in this case Red / white and you have the drive conductor (Blue / Red - Blue / Org - Blue / Yel)... I can't turn on the machine as it blows the fuse and I can't just measure across the two connections as bulb should make it connected. Is it possible that the drive transistor is toast? I will try removing the J124 connection tonight but if the transistor goes to ground and completes the circuit, how do I diagnose the transistor?

Thanks!

Was it something I said? I guess those that know would rather talk about whether or not they have a popcorn machine in their gameroom?! Well, I've successfully gotten it to turn on without throwing a fuse however I had 4 ground shorts.(my original problem) I have found two of them so far. The above issue still exists though, two of the flashers stay lit (Romulan) and the Red one on the right side of the backboard. Anybody have any advise on what to look for on this? Thanks!