Had the flashing problem on a model 100604-BLK (old 6 pod version). C8 (a 330) measured 314 µF, C9 (also a 330) measured128 µF and C10 (a 10) measured 8.5 µF. I suspect it was C9, but I just replaced them all and fixed.

Board is in the LED hood under the light panel. A few obvious screws. Board is labeled.

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Re: New Members - please post your introductions here

Hello. I found this place when looking for some info to repair a vintage APC UPS. I'm not an EE or anything, and very novice with board level repair. I had been using a crappy soldering iron for many years with limited success, but started doing a lot of work with LED lighting and home automation, which gave me the need to solder things onto board pads in order to flash them with custom firmwares, so I got a nice, temperature controlled soldering iron for Christmas. Now I'm learning a little bit more about circuitry, and looking...

Re: APC Back-ups RS 1500 Dead

Posting another success. I replaced with identical 16V and works fine.

Input voltage was previously showing around 107V. After repair, showing 123V....