Warriors of Rock Guitar does not stay on

There seems to be an issue with the power, the lights will turn on for a moment then will immediately turn off

I’ve changed the fuse - 3.6*10mm 3.15amp but the problem still persists (I’ve done as best as I can with my limited knowledge of electrical and soldering)

Is there a capacitor anywhere that I’m missing? Can’t seem to find one. Any recommendations for different fuses or solutions would be much appreciated!