The other day I booted up TZ and got a message saying "Check Fuses F114 and F115". This seems to be a somewhat common issue and rather well documented. I'm still more or less a novice at diagnosing and fixing this stuff so hopefully this makes sense. I started with the PinWiki section on this issue:
F115 fuse had blown. I replaced it and it immediately blew again. LED6 was lit but LED1 was not. So I checked D1 and D2 diodes. I think I did it right by going to the continuity/diode setting and touching each end. One way gave a reading and the other nothing which I believe is what's suppose to happen.
I then wanted to rule out the MPU (someone had mentioned this as a potential issue in a thread here I looked up). I disconnected the J210 connector on that board and replaced the fuse F115 fuse on the power board. Turned it on and the fuse didn't blow. LED1 was also was lit. The PinWiki implied that this means it's an issue with the MPU. I have a brand new Rottendog MPU board handy and swap it in. It works! I start up a game and on the 3rd ball the game starts doing some funky stuff. Not recognizing shots and so on, then the "Check Fuses F114 and F115" message pops up again. Fuse F115 has blown and LED1 is no longer lit.
So I'm fairly confused. Removing J210 and everything works fine I'm told would make this an MPU issue. But odds of both boards (including a new Rottendog board) having the same issue seems slim. I guess at worst I'm trying to figure out where the likely culprit lies. I'm not sure I could handle board work yet but at least knowing which one has the issue would be great. Or if something else could be causing the issue on the machine. Any help would be much appreciated!