[weblacky]

Okay...well that didn't go as planned.

I got the parts I thought I needed.  Removed all the old parts I thought where required (I didn't replace the MOSFETS because they looked okay, I still may have too).

   
   
   

Then cleaned and used low-temp solder paste to install the new stuff:
   

I thought things were good, installed it in my Fuel and..........

Instant ATTN 12V PIMM low at ~9.28v!!!!

Ugghh...so I 100% know the original error I saw was PIMM 5V too high at 6.28v...now there appears to be a short on the PIMM 12V line.  I'm very sure I didn't install parts backwards as I made a diagram for the caps and the diodes are marked on the board for orientation (and I felt that agreed with previous observations when I was last working on the diodes) and old pictures agree with what I have installed now.

So remember how I thought there might be multiple issues...well unless these parts were bad...there is still an issue.

Since I have everything apart right now, I'll try to use my working PIMM and compare this broken PIMM and see if I can find a safe way to locate the issue.


Also a note, I was wrong about the VRM output cap turning high ESR, it was showing as high ESR in circuit, but upon retesting it after removal it appears to be fairly normal.  So that was a false positive.  However, most of the 100uF caps were barely inside tolerance, so things needed changing anyway.

More to come.