Digital keyboard Technics SX PX336 : i would need the schematic

[tepsamps]

Hello,
i try to repair this digi piano, and would be pleased to get the PSU and amplifier board schematic.
Or some help for sure.
The issue is that only the power-on indicator led glows at start up, that's all. The fuse is OK, transformer also, but it seems that the digi board (green one) gets no voltage. And without a hint i'm lost, i did not find any blown or unsoldered part. I checked every connector...
Any help is welcome.
Thanks

EDIT : actually, the diodes are very strange so are the filtering caps... Posting in another section with pics...