V+12 power is out of normal range -- changing power plug worked

there's already some other threads about the same problem (see below), but as the devices get older every day, the problem may occure more often -- and of course, it's not covered by warranty.

symptoms:

* my ReadyNas Ultra2 log got flooded with warning messages like:

V+12 power is out of normal range [expected: 12.00 current: 10.82].

* later, the NAS would turn itself off, later not boot again

* the sound while booting suggested a lack of power...the disks would try to spin, but stop again

* at some point, the NAS would not even start without disks in it, but would turn off after some seconds

* replacing the power supply ("brick") would not solve the problem

other solutions:

* in the thread: Ready NAS Ultra 2 power supply issue and out of support the solution is: cleaning the inner side of the chassis! the problem seemed to be dust.

* in the thread: V+12 voltage in enclosure Internal is out of spec. (10.72 V) it's discussed, if the device can run at a lower voltage -- and revealed that you can measure the voltage on the SATA backplane. Running at higher voltage: bad idea.

* there's also a description on how to change the sensor's limits, if the sensor got corrupt (but voltage on the backplane is fine)

my experience:

* changing the power supply -- no difference

* opened and disassembled the chassis, cleaned everything -- no difference

* measuring voltage on SATA backplane: <11.0V!

* measuring the downside pins of the power plug on the main board: <11.0V -- BINGO!

solution:

* the inner pin of the power plug was corroded/worn out. Soldered cables to the pin and a new plug outside of the chassis -- works great!

pictures of today:

SATA power pins -- measure between 5 and 15: 12Vdestroyed plug, black change on plugbuilt in plug: standard part in electronicseasy accessible pins of plug