Hi, I just read your post and I'm having the same problem with 3 g5 iSights. I've recapped fully them all, and no chime, full fan, and black screen with only led's 1 and 2 on. Did you find a solution? I've gone over the solder again on each, just to make sure no cold joints but perhaps there still is some? Thanks for an info on your fix!
Matthew

Re: imac G5 iSight, psu 614-0394

thanks. replaced the CMOS battery, reassembled the computer. now the symptom:

diagnostic LED's:
plug in AC--LED 1 lights, as expected
power on--LED 2 lights, as expected
pilot light at full brilliance, fan on low speed
no startup chime
screen is black
LED 3 never comes on

unplugged AC, then performed SMU reset procedure, then restarted trying to boot from install DVD--but superdrive never "swallowed" the disk.
same LED diagnostic--1 and 2 lit, 3 not lit;...

Re: imac G5 iSight, psu 614-0394

which thread? i used the search tool on the home page to search for "bad onboard battery" and didn't find a link to a thread with that many posts.

thanks

symptom:
when power button depressed, pilot light comes on for 1/2 sec, then fan at full speed for 1/2 sec, then powers down.

i dissassembled the imac. no obvious swelled or leaking caps on the logic board or power supply.

i read this thread: [url]https://www.badcaps.net/forum/showthread.php?t=15205&highlight=614-0394[/url]

and my PSU is the one pictured in post #4.

the fuse tests good.

when connected to AC, i get 11.56 volts across black and gray (both sets of black and gray) and negligible across black and...