EDIT/POSSIBLY GOOD NEWS 1/12 10pm PST: Before you guys go reading through the below (that I wrote a couple hours ago), hang tight. I think I may have just figured out the root cause. Please give me until tomorrow 1/13 to report back. I don't want to jump the gun just yet. I will share my detailed findings in a new post if I determine that I actually found root cause and ultimate resolution.
PREVIOUS POST (keeping for good troubleshooting measure):
Quoted from mbwalker:
timlah 79, is this a plastic piece or metal? Might be a good idea to take off the plastic up top and look for shorts around the light sockets if you can't find it anywhere else.
That appears to be metal. However the lights / w/e those lead to are not part of this GI AFAIK. For good measure I made sure nothing was touching that metal and I unplugged all 3 connectors one by one powering on/off in between. No change, same errors.
Quoted from Markharris2000:
I hope I am not losing track, but with all the bulbs removed, and the cn15 connector disconnected, try to use a meter between the points I circled on GREEN on each of the sockets. You should see NO connectivity, regardless how how much wiggling you do with the wires.
Yes with or without the bulb in, socket attached or reattached, CN15 attached or not, *when the errors are happening* EVERY socket in this GI has continuity. My understanding is that's because they are all in parallel. Which makes this so difficult to find a culprit. When the GI decides to be fine for a few min, all continuity is gone.
Quoted from vireland:
Where the arrow is pointing, is that solder? It shouldn't be there, and if it's running down, it could be making a short.
Also, the area highlighted in red is the metal plate for the playfield rail to slide and rest on. Is the GI wiring over that area in the picture pulled away from that and tied back before the playfield is lowered so it's not pinched? That would DEFINITELY cause a short, and if it was pinched at some point in the past, may have created the short you have.
Also, have you tried power on with the playfield up and CN15 plugged in? Does that work? If it DOES, try wiggling each segment to see if one segment causes the GI to go out.
For the record, the yellow wire is the voltage lead. White is the return.[quoted image]
That may have been solder. I was able to easily scratch it off with one swipe of my fingernail. No change. Also that was the first socket I unsoldered tonight, no change. Also, the reason why you see those wires near the metal guide is because I had started clipping the zip ties. To 1000% clarify, the issues occur when the playfield is up sometimes, when the playfield is down sometimes, no rhyme or reason. Every time I do test I make 100000% sure no wiring, no metal, anything is touching other metal.
Are we 100000000000% sure that this isn't just a Node board 9 issue itself or something completely not a part of this GI? In other words, do we really trust the DIAG's assessment of overcurrent protection continually pointing to Node 9 and shutting down this upper left GI? I understand you guys are saying, well the issue NEVER happens if you have CN15 disconnected but what is that really telling me?
Again like I've stated before I feel like there is a greater electrical problem in my machine that either has to do with a slowly failing Node 9 or something completely different.
These are the many reasons why I feel this way based on my statements/findings earlier plus what I've done and seen tonight:
- Last night after giving up as the issues were still occurring, everything attached as is, I put the whole thing back together. Balls removed still. Powered it up once more to make sure the issues were still happening -- they were. Tonight all I did was flip the power on and NO issues. In other words nothing physically changed from issue to no issue within this time period.
- I removed the glass while all GIs were working and started loading balls in again ever so carefully. This time on the 3rd ball BAM GI's went out. Going to the DIAG shows the overcurrent alert. Power off and back on, here we go again with the errors.
QUESTION: Why would that be the case if we think this is an intermittent, mechanical related short somewhere getting aggravated/triggered by vibration?
- Now with the playfield up yet again, I unsoldered and completely removed 5 of the 9 GI sockets (starting with and including all the ones in question throughout this thread). In between each removal, I made sure sure no now exposed wires were touching anything, powered off and on, issues persisted each time. I tested continuity between each wire too each time and of course all have it.
- I then returned to unraveling, unclipping probably 10-15 stock zip ties, separating wires, jiggling in between power cycles, etc. No change
- I powered off, leaving the playfield up as is, no physical changes. Came back and powered on and NO issues/alerts + remaining GI bulbs were on again
I cannot go continuing to clip off zip ties. Each time I do I have to somehow make sure nothing is touching anything b/t power cycles. The more I do, the more I'm going to risk shorting somewhere I can't see or shaving off the shielding of any given wire.
When the overcurrent issue happens it's not like I can shake wires/connections to make the machine go back to normal. Even if I fix the short temporarily in that exercise, the machine doesn't just go back to normal. It's a power cycle over and over again (which is probably not good in general) just to see if xx wire or xx socket I've messed with has made any difference.
I can continue unsoldering the remaining 4 sockets and send pictures of each (which all yet again have no bulbs in them since I took them all out again tonight), testing continuity b/t wires of all at each step, but where is that going to get me? I'm now messing with wiring and sockets that have not been touched at all since day one. The continuity testing at this point is pointless since when the issues are occurring ALL sockets/wires show continuity regardless if CN15 is plugged in or not. Not once have I gotten to a while in the issue step to find xx socket or wire is bad. It's impossible since they are all in parallel, right?
Also please keep in mind that I've also physically inspected each wire/socket/board along the entire way to the point of bloodshot eyes. Again even if I can figure this out, I'm going to have to spend hours putting everything back together without messing something else up in the process.
I'm truly at a loss at this point. I've got to be around 20 hours into all of this. How much would I have to pay a technician especially since diagnosing the issue is such a step by step, hope for the best without any real data situation? Should I just buy a new Node board and go through that careful connector removal and re-plug exercise or are you guys certain that it's not a node board itself issue? The path that I'm on seems like wasted effort riddled with more confusion and going down the wrong rabbit holes, ending up in me having a mess I have to spend more time than I have troubleshooting in order to put it all back together. I really wish someone with a JP specifically who has had this UPPER LEFT GI and TROUGH FAILURE before would please chime in.