Hi,
Suddenly our office wasn’t connected anymore. After a couple of minutes we’ve found out that our router died. Searching the internet pointed us towards a power supply failure, but unfortunately after trying another power supply from another chassis it still won’t turn back on.
Is there a way to measure the bord behind the PSU? PSU is making a bit of standard cheap electronic noise, a high pitched beep.
That doesn’t sound good.
Use a simple multimeter to measure the voltage over the yellow-black wires in in the 4-pin 12V-ATX connectors on the motherboard. Should be 12V or 24V
When ATX connector is connected to the mainboard fluctuating voltage, same behavior for both PSU 's
When disconnected from mainboard both measure 12V on yellow-black wires
Since it is whining, it could be related to a further stage of the power supply (on the router motherboard) that reduces/converts the voltage from the 12 Volts to 5 or 3.3 V (that part is on the router mainboard).
Coil whine is typical of power supplies when no or very little power is drawn and a capacitor (or inductor) acts strangely, sort of vibrating.
There is a repair guide/checklist for the 1036 floating around, but I think it is for the first revision, while yours should be R2 (since it is 12V):
https://www.mkesolutions.net/descargas/manuales_rb/CCR.pdf