APC SU1400 All lights flashing issue
Posted: Mon Jun 17, 2019 1:25 pm
So my APC 1400 would go for a few weeks, then just die with every light on the front flashing. APC's support pages just says "hardware failure" which is of no help. After searching the web for hours, it seems a couple people claim to have suggested its the relays inside going faulty. I came across a video of a guy with a similar PSU and a similar sounding fault (here).
I documented my progress as I went along, as no doubt I will forget what wire goes where all something anyone else reading this in the future, this isn't a "how-to guide", its just simply documenting it as I am going along as it may help others in the future..of course at the time of typing, I do not know if this will fix the issue until I try it and that is run for a few weeks... It may well just explode after I fiddled with it, who knows...
The very dusty and poorly power supply..
Removing the bottom screws to release the black case..
removing the top plastic cover, which just pulled off..
Annoying metal lug things, I managed to fiddle the board out of these.. There is also a screw on the back of the case which needs to be removed as it holds the circuit board in place..
..and it would be too easy if the board just lifted out at this point...
Time to investigate..
The main one is the huge connector at the end of the transformer cables needs to come out..
The ribbon cable needs unplugging from the right side of the board, and the battery backup cables need the screw removing to release them...
Large connector comes out by pushing their tabs inwards and simply lifts out..
The black cable need some plodding next as this is in the way...
There is also a cable tie hidden away at the back that needs decapitating.
This annoying plastic box had to be moved out of the way as there was some plastic bits on the heatsink fins preventing the board from pulling out, so I just unscrew the box, and pushed the clips gently inside, so it will come out, and the ribbon cable comes out with it..
White connector comes out next...
a better view of the cable tie (not yet chopped) and black cable removed...
lot more freedom now, getting there..
The blue and brown cables come out next....then unscrew the white and black cables on the heatsink..
freedom!
These are the relays I'm going to un-solder next and see if I can find some compatible replacements..
more to come later...
I documented my progress as I went along, as no doubt I will forget what wire goes where all something anyone else reading this in the future, this isn't a "how-to guide", its just simply documenting it as I am going along as it may help others in the future..of course at the time of typing, I do not know if this will fix the issue until I try it and that is run for a few weeks... It may well just explode after I fiddled with it, who knows...
The very dusty and poorly power supply..
Removing the bottom screws to release the black case..
removing the top plastic cover, which just pulled off..
Annoying metal lug things, I managed to fiddle the board out of these.. There is also a screw on the back of the case which needs to be removed as it holds the circuit board in place..
..and it would be too easy if the board just lifted out at this point...
Time to investigate..
The main one is the huge connector at the end of the transformer cables needs to come out..
The ribbon cable needs unplugging from the right side of the board, and the battery backup cables need the screw removing to release them...
Large connector comes out by pushing their tabs inwards and simply lifts out..
The black cable need some plodding next as this is in the way...
There is also a cable tie hidden away at the back that needs decapitating.
This annoying plastic box had to be moved out of the way as there was some plastic bits on the heatsink fins preventing the board from pulling out, so I just unscrew the box, and pushed the clips gently inside, so it will come out, and the ribbon cable comes out with it..
White connector comes out next...
a better view of the cable tie (not yet chopped) and black cable removed...
lot more freedom now, getting there..
The blue and brown cables come out next....then unscrew the white and black cables on the heatsink..
freedom!
These are the relays I'm going to un-solder next and see if I can find some compatible replacements..
more to come later...