Hi, first time poster but long time lurker of the forum. Most of the time I can follow @Coulombs threads and find the answers I need but I haven't been able to find the solution to my current problem. 

I have 2 of these Voltronic Axpert VM IV 5,6kW inverters that are giving no display and no RGB LED ring either. At first, I figured it may be the mainboard as outlined in the service manual(Page 7), but switching the mainboard out for one that definitely works didn't sole the issue. So at this point, I can only assume the issue lies with the CNTL or RGB&LCD board. 

Has anyone else run into this kind of issue, because I will take any help I can get narrowing the issue down. These are both boards I don't really have spares for so If I need to replace one I would need to order the board, I really don't want to end up having to order the boards on a guess just to find out I was wrong... Can anyone offer any advice or assistance with this?

 

You time and assistance are both greatly appreciated.

Psyche

1 hour ago, Psy said:

giving no display and no RGB LED ring either.

That sounds like a power supply issue. IF the RGB and LCD board is based on the removable display board, there may be SMD fuses near where the power comes in; I would check these first.

In the removable displays:

 

On these, CN8 is where the display board connects to the inverter.

I've never seen inside an inverter with the colour display and round LED ring.

Edit: Of course, if the fuse(s) is(are) blown, the question remains as to why. Was it just fatigue, or is there a fault? The isolating transformers do seem prone to overheating, possibly due to shorted turns of the ultra-fine enamelled wire. Unfortunately, these transformers are not off the shelf items. It is possible to repair them however; see the AEVA repair topic for details.

Edited October 13, 20223 yr by Coulomb

Perfect, that's exactly what I was hoping for... a place to at least start. I am knocking off for the day so will be sure to check those first thing in the morning!

If you are looking for more info on the inside of these things, let me know. I have a couple laying around and I am always more than happy to help where I can. Otherwise, I cannot se it being fatigue, the displays wouldn't come up on installation. I'm assuming it either insta-fried upon connection or it's just a dodgy board, at least now I know that there are fuses to be checked and I'll check the resistance of the coils before reporting back.

Anyway, really appreciate the info and hope to come back tomorrow with good news. Until then, take care and have a great one!

Psy.

EDIT: I opened the unit up and checked the fuses and transformer as advised, the boards are a little different but found the fuses alright. Didn't find anything too out of the ordinary when compared to a working unit I have around for reference measurements. I did however end up finding a component (U2) that had some mild discoloration and the board was browned on the back of it. I'm guessing that's the culprit... Otherwise, the rest of the board is providing pretty normal readings.

 

Edited October 14, 20223 yr by Psy
More Info became available after initial post

Hi. I have already solved this problem. The whole problem is that STM 32 is KO. This is the main processor on the board, which has version 35.73 loaded into it. The stabilizer marked in the picture is shorted to GND. Hence the warm place.

On 2022/10/13 at 5:39 PM, Psy said:

Perfect, that's exactly what I was hoping for... a place to at least start. I am knocking off for the day so will be sure to check those first thing in the morning!

If you are looking for more info on the inside of these things, let me know. I have a couple laying around and I am always more than happy to help where I can. Otherwise, I cannot se it being fatigue, the displays wouldn't come up on installation. I'm assuming it either insta-fried upon connection or it's just a dodgy board, at least now I know that there are fuses to be checked and I'll check the resistance of the coils before reporting back.

Anyway, really appreciate the info and hope to come back tomorrow with good news. Until then, take care and have a great one!

Psy.

EDIT: I opened the unit up and checked the fuses and transformer as advised, the boards are a little different but found the fuses alright. Didn't find anything too out of the ordinary when compared to a working unit I have around for reference measurements. I did however end up finding a component (U2) that had some mild discoloration and the board was browned on the back of it. I'm guessing that's the culprit... Otherwise, the rest of the board is providing pretty normal readings.

 

If that voltage regulator (3.3v) heats up, the microcontroller has short circuit on the power lines. It can be replaced (if you have the necessary tools and skills). I've done it on 2 boards and i was successful. the STM chip needs to be reprogrammed, there is a separate thread on how you can do that.