View Full Version : Troubleshooting power supply

03-16-2014, 11:21 PM
I have several identical power supplies from TCD240xxxx units. (SPWR-00004-000 REV A1)

Placing each of these power supplies into a TCD240xxxx unit and applying power, they all will power the fan. However, one does not spin up the hard drive. (Yes same test unit, same hard drive)

When I test the leads to the power supply I get the normal 12V and 5V for all the power supplies, even the one that won't spin up the hard drive.

Therefore there must be some information from the ribbon cable that is informing the hard drive not to spin up.

All the capacitors look good., No strange noises, no signs of discoloration.

Any suggestions on my next steps?

Thanks in advance!

03-21-2014, 06:49 PM
Are you testing the power on the 12V rail WHILE the drive is connected? Perhaps it's failing under load.