Got a Yamaha SPX90 here for repair. Not working at all. Some parts on PSU look suspect, some are wrong and some are missing.
1. suspect resistor. Not even that the resisitor may be damaged, but there is a green substance on it which looks not normal.
2. Spotted that someone before me tried to repair it and tested some parts (diodes). But this is the wrong one. This should be a schottky diode.