Akai LCT2715 power supply repair?

[miniman82]

Just inherited this set, only the 5v section of the power supply shows any life after replacing all the burst caps in the secondary side. You guys have any pointers for getting the 24 and 12v sections working? The PWM chip for that part of the power supply has no VCC going to it, but I'm not sure if that's intentional as a sort of stby mode or what. Looks to me like the thing should be making voltage all the time, waiting for the set to pick it up when needed.

I do have 21v sitting waiting on a transistor that looks as if it switches power to the PWM chip, but just to test I jumpered it to VCC and nothing happened. Suppose it's possible the PWM chip gave out, but I don't have a replacement and can't work with SMD stuff at home anyway. Schematic sure would help.