@renuvian for now I would not think about replacing the board. I’d go for the fan first. This “fan makes a very loud noise that almost sounds like a helicopter” should not be normal. It may be a 24V fan so check that out before your order a new one. We would need to see the board where the fan plugs into. It does sound like it might be PWM adjusted and the speed control may have failed. Look for obviously damaged components like bad caps on the board. Of course, you will have to discharge the capacitors in your UPS so you do not have a shocking experience while working on it.
A board may also be quite costly and since you got this unit for a “decent” price, I would consider creating a work around with either a new speed control circuit or a simple switch. Post some good pictures of your board, fan can connector etc. with your QUESTION. That way we can see what you see. Ajout d'images à une question existante
Try a reset as well and see if that clears this up.
How to Brain Dead a Back-UPS unit. (Full UPS Logic Reset)
Issue:
To brain dead a Back-ups is to purge the charge in the brain of the UPS.
Product Line:
Back-UPS, Back-UPS Pro
Environment:
All serial numbers.
Cause:
Troubleshooting procedure often prescribed to clear some faults or unwanted behaviors.
Resolution:
To do this, follow the below procedure;
1: Disconnect any attached load.
2: Unplug the UPS from the wall socket.
3: Disconnect the UPS' internal battery.
4: Push and hold the ""On"" button on the UPS for 5 seconds
5: Reconnect internal battery.
6: Plug UPS in to known good power source.
7: Turn UPS on.
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