Teardown MG MG5 combined charging init

[Matoleno]

Hi All. I got my hand on "faulty" MG5 on board charger (EP2CCU6625A).

I did not have a way to tedt, so I decided to look inside
Not the best idea ever, as due to the cover being glued on, it was hard work and i have damaged the unit a bit.
So I'm sharing info/pics, so you don't have to repeat my mistake;-)

Just need to upload the pictures...

Bit later I will try to test if any of the functions (charging/DC-DC/V2L) are still working.

Top with cover:

Top-less

Bottom with cover:

Bottom without cover:

Connector side:

[uhi22]

Did Damien have the same type on the bench? He did not open it, but was successfully control it by replaying CAN messages. He published a video about this in the last weeks.
[Edit] Link to video:

[Matoleno]

I think it is the same unit, but Damian will have to confirm is unit is also EP2CCU6625A.

Once I test what is still working, I will probably try to get the PCB off to dig deeper (especialy if nothing is working).

[Matoleno]

No luck getting this unit to do anything useful.
I have another unit (same part number) and I'm trying to replicate what Damien did in his video. Unfortunately no luck so far getting it to do DC/DC to change the 12v bat. Did not get around to try V2L or hv battery charging yet.

Can anyone help please?

[tom91]

Provide info on what you tried. Also check if you get the expected CAN frames out.

[Matoleno]

hi Tom91,

I had busy weekend, but I can report some progress on this.

So first I just powered up the unit with 12V and did get messages consistent with Damians log. I have also managed to figure out meaning of some of them (wil attach my notes).

Then I have enabled HV DC and sent the two messages wich Damien mentioned in the video/notes as required for DC/DC function - no luck there.

After that I thought to go back to square 1 and used the complete log (minus the messages from the CCU) and after couple of minutes the DCDC started working. it took 2-3 minutes as the log is massive and the DCDC is enabled about 1/5 in the log.

I tried couple of times with smaller subset of messages, but no luck. As I needed to put the unit in the car, I did not have enough time to isolate just the required messages.

I now have two faulty/patrial units which I will experiment with when I have some spare time.

[Matoleno]

I have decided to take one unit completely apart(it's faulty for sure so..)..
So here are few more pictures..

And yes there is a burn mark next to one of the diodes I guess..
If anyone wants to see specific detail just let me know