YAMAHA MODX7+ won't power on

Hi everyone,

I have a brand-new Yamaha MODX7+ that won’t power on at all — no screen, no LEDs, and no response from the power button.
I purchased the unit from Japan (PA-150B adapter included). It arrived in pristine condition, unused, in original packaging with all protective foam.

Here’s what I’ve done:

Measured the adapter output with a multimeter: stable 12.15V

Tried different outlets and high-quality plug adapters (I’m in Europe, 220V)

Removed all external connections: no audio cables, no sustain pedal, no USB

Held the power button for 5 seconds — no reaction

The DC jack is firm, with no wobble

I gently twisted the DC plug during power attempts — no effect

At this point, I suspect either:

1. A blown internal fuse
2. A failed power regulation circuit on the mainboard or power board
3. A disconnection somewhere in the internal chain

Before I open the case, I’d appreciate any advice:

Where exactly is the fuse located?

Is it a T1.25A 250V slow-blow (5x20mm)?

Has anyone here successfully replaced it?

Any other suggestions?

Thanks a lot in advance! 🙏
I don’t want to ship it back to Japan.