Audio Developments Mini Mixer PSU Fail

[AudioIngenia]

Hello everyone. A problem with this mixer is driving me crazy.
On ebay I bought a small Audio Developments AD31 mixer.
We have replaced all the electrolytic capacitors.
A 24v to 48v DC/DC converter circuit has been added for phantom power, as well as switches on each channel.
A module for 8 balanced outputs from JLM Audio has also been installed. This is powered by a 24V to +-15v DC/DC converter. .
When I connect the set to the lab power supply, everything works fine. Consumption is 360 milliamps
Now these are the problems:
- When I connect to another 24v 3A linear power supply, it never starts.
- In a 7A linear power supply, sometimes it does not start.
- With a Chinese switching power supply, the IC of the 48v converter explodes.
- With another Meanwell power supply, everything works but there is a triangular noise in the background.
What can happen here?

 

[Whoops]

It's really strange that behavior I really don't see why is that happening.

Very cool mixer by the way, looks very nice, channels are modular,transformer input with Limiter on the Master Bus , it reminds me the 70s type of small mixer like the Alice 828

 

[NOON]

Current deaw could be below the minimum load for the power supplies if they're switchmode. The Meanwell might just need better filtering like a common mode choke on the output.