Long shot but does anyone have the schematic for this NAS, it looks like the board is a KN-20006-A01251-YS-RS? I have one coming in soon that turns on then straight back off again. Or at least a similar one (it looks like the TS-569L and TS-869L are based on the same Atom D2700 platform, and the TS-259 Pro II was based on a similar Atom D525 platform)
Cheers
Cheers
somehow I always 'forget' until just after it's too late that (a) the slightest application of heat to the power button shorts it internally, permanently, rendering the system unbootable, and (b) removing the button entirely, being a tiny tiny tiny momentary 'tact' switch, and surface-mount to boot, invariably destroys the support circuit for it, immediately adjacent.