Hi, we have been using the RB450G along with another hardware in a file server device, one of the RB450G has failed, seems that a IC near the power input has failed and the RB fails to power up.
Any Idea what can cause such a failure ?
Have you seen a similar failure?
I have attached photos of the failed device
Q801 is the over voltage protection MOSFET, apparently you had problems with a voltage spike
OK, understood, Any details over the maximum allowed voltage from which the device blows ? I guess that the device is designed to have an external fuse and blown it, instead of blowing the MOSFET.
Regards.
I will answer myself, from te RB450G user manual:
Powering
Power options:
● J9 power jack:
10..28V DC (cut-off voltage - 30V)
● Power over Ethernet (PoE) on the J601 LAN1 Ethernet port:
14..28V DC (18..28 V suggested; cut-off voltage - 30V) non-standard PoE powering support
The board has two direct-input power jacks J801 and J803 for use with different cases (5.5mm outside and
2mm inside diameter, female, pin positive plug) and can as well be powered with PoE. All power inputs are
always active, but only one should be used at the same time.
RouterBOARD 450 series boards are equipped with a reliable 25W onboard power supply with overvoltage
protection. 12..28 V DC input voltages are accepted, but when powered over long cables, it is suggested to
use at least 18V. The system is tested with 24V solar/wind/RV systems with 27.6 charge voltage.
Overvoltage protection starts from about 27.8V-29V (depends on some part physical options, works up
to 60V), so the board will not be damaged if connected to a 48 or 60 V power line.