I just tried to repair an external iomega raid hard drive ...
the external power supply was dead, I replaced 5 capacitors, and voila like new power ...
but
the hard drive still does not power on ...
hopefully, I have another one, looking for voltages inside, all the same, seems an holtek chip is not working...
it is a preprogrammed controller, it only powers the fan when it's too hot, and detect the press of the power button ...
confirmed later with a thermal camera, the chip is hot, and not on the other working drive.
I cannot order the chip, and cannot program it if I can have one ...
drive full dead ... because of a proprietary chip .