I have an APC BR550GI Pro UPS
https://www.se.com/il/en/product/BR5...ckups-pro-550/
The motherboard model I have in the UPS is the 640-1172A-Z_REV05
The problem I have is that my UPS does not seem to charge the battery when ON.
After charging the battery with an external battery charger and installing into the UPS (updating change date) the battery drains slowly ~7% every 12 hours with no load connected (the PowerChute SW show decrease in jumps of ~7% not 1% decrements).
I think it does charge the battery when OFF because I measure ~0.3-0.4A on the wires to the battery. and when connecting external battery charger it does say battery is at 100%.
The UPS does switch from Mains to battery and back when it should.
I see no physical damage to the board.
The 2 fuses F4 and F5 are OK.
Does anyone have the schematics of this board or can help point me in the right direction for troubleshooting and finding the bad component/connection.
Thank you
https://www.se.com/il/en/product/BR5...ckups-pro-550/
The motherboard model I have in the UPS is the 640-1172A-Z_REV05
The problem I have is that my UPS does not seem to charge the battery when ON.
After charging the battery with an external battery charger and installing into the UPS (updating change date) the battery drains slowly ~7% every 12 hours with no load connected (the PowerChute SW show decrease in jumps of ~7% not 1% decrements).
I think it does charge the battery when OFF because I measure ~0.3-0.4A on the wires to the battery. and when connecting external battery charger it does say battery is at 100%.
The UPS does switch from Mains to battery and back when it should.
I see no physical damage to the board.
The 2 fuses F4 and F5 are OK.
Does anyone have the schematics of this board or can help point me in the right direction for troubleshooting and finding the bad component/connection.
Thank you
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