I have a T630 that has started powering off after a random amount of time, usually less than 12 hours. When it powers off the backlight of the front panel LCD goes off as do all lights on the case, and iDRAC also doesn't work. So it looks like there's a problem in the power. Dell support seem to have run out of ideas, presumably because they don't want to suggest that I replace parts and they know I'm not going to pay Dell support.
I suspect it could be a faulty Power Backplane board J14R7 0J14R7, how would I test for that?