ChristofER: I bought a chinease clone of a MUT III diagnostic tool, and I can use it to scan all the DTCs like a real MUT III, but one of the
weird things is that when I go to the menu section to look at things like EV-ECU, CMU, BMU and OBC hardware and firmware revisions, it cannot read anything from the OBC. I've tried it on three different fully working IMIEVs and same situation. From what I've read in different places, There is more than one canbus in the IMIEV, and the EV-ECU acts like a firewall connecting between them. KIEV can correct me, but I think DTCs from the OBC get copied to the EV-ECU, and the MUT III is reading these error codes from the EV-ECU and not from the OBC itself. I had a case where I read OBC and DC-DC errors (because the 20 amp fuse was blown) I replaced the 20 amp fuse and the OBC with a different charger, and when I powered up everything again, I still had the OBC and DC-DC Errors. I had to erase the stored errors and run it again fresh to get the real status. Since you had to unplug all the nest of wires and quick disconnect connectors on the main PCB, I would do another re-check through that all of those got plugged back into the correct spots.
When I was frist starting on a OBC, I used KIEVs suggesting to solder wires onto the pins on the connectors along the white strips (all the connections you had to unsolder to remove the waffle) and I ran these wires out to a external terminal block. I could then apply AC to the input of the charger and check different voltage points while the top pcb was safely fitted back down. Check what voltage is sitting across the big three caps. That will tell you if the front end of the charger is ok. You can use KIEV's schematic of the main board to see which white strip connector pins can be used as test points.