certaUPS C200 1000va UPS won't run on batteries

[benweston]

I have come into possession of 2 certaUPS C200's and one works flawlessly but with slightly shorter battery life which will get sorted at some point but the other one turns on fine with mains power but lasts only a couple of seconds once the power is turned off even with no load connected, I have swapped over the batteries between the units which makes no difference to either unit so I'm happily that both battery sets are equally fine, inspecting the PCB of the defective unit I see no heat spots, bulging caps, cracked chips, blown fuses etc but what it does have is what I believe to be a failed crystal resonator with SJK 4.9152 stamped on the top. Before I delve into sourcing a replacement and soldering it onto the board is there anything I need to check that would have caused this failure or am I good to swap it out?

any and all help very welcome.

[CapLeaker]

Measure it with an oscilloscope and see if it's working. Never seen any crystal like that. Makes me wonder if it is a solder blob.

[benweston]

Will do, a friend at work has one 👍

[benweston]

just to update we got this on his scope and it checked out ok, putting it back on with the excess solder removed and it works fine now so was probably just the solder blob causing issues.

[CapLeaker]

If the blob grounded out the crystal it sure would have issues. At least it works again!