Re: APC BR550GI Pro UPS not charging battery

Yes, I've measured them by removing from board. If I measured them on the board, it was more or less normal, but it was not so.
I've orderen another elkos 330mkf 63v from Panasonic.
now all is working fine!
Change your capacitors and have a look what happens.

Re: APC BR550GI Pro UPS not charging battery

There are two capacitors on th board -- C18 and C32

Please take a look at the capacitor C18. It is 330mkf
I've measured it with multimeter and it was about 250mkf...
I've changed it to something I've found (470mkf 50v) and UPS is working again. Charge voltage about 13v!
Hope this helps you.

Solution - change capacitor C18.

Best regards,
Q

Re: APC BR550GI Pro UPS not charging battery



This is simply heatsink for TNY278PN.

I have the same symptoms. I've changed TNY278PN chip, but there is no changes. Problem exists.
battery will not charge!
If I switch UPS on, it makes it internal tests, shows that battery is empty, but no error message.
If I disconnect the battery and measure voltage on battery pins, it's about 9V -- this is the reason why the battery does not charge.

Has anyone Idea why it could happen? Why it does not charge the battery?
...