-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello, On Feb 15, 2009, at 12:59 PM, Jochen Kunz wrote:
On Sat, 14 Feb 2009 23:17:19 +0100 Frank Wille <frank%phoenix.owl.de@localhost> wrote:I heard about the possibility to open the chip, which Michael mentioned. And I even used a soldering iron before, but I cannot imagine that I could cut it open without any bigger accidents (to the NVRAM and to me ;).The tric is to use a file (rasp) and carefully file down from the topof the chip until you reach the battery. But do this only in the cornerwhere the battery is located. At least on the Sun NVRAM chips the top of the battery is +. There goes a wire down from the top of the batery to the chip. Carefully prepare this wire out of the resin with a hand milling tool ("Dremel"). Cut the wire from the top of the batrery, solder an extension wire to it and + of the new batery to the other end. Solder - of the new battery to a wire and the other end of it to the GND pin of the chip. I.e.: Do not connect to - of the old battery. It is buried too deep into the resin.
I used a pocket knife to scrape off the edges and then pry off the 'lid' of the chip package. Then I carefully dug through the resin that fills it ( much softer than the plastic shell ) until I found the battery, removed the resin around it, cut off the connectors and removed the battery. The connectors don't go straight down but lead to the nearest short edge of the package and go down there side by side. That's where I soldered new wires in.
have fun Michael -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) iQEVAwUBSZhcacpnzkX8Yg2nAQKzrgf/TwJRUAmRWS0kNOtm6V/SgDhMsTWwtFvc oUoSzvfTstF71Qn2AXCDzaotzHO1gjHWA2hBVXYGCLvtN59LSYAjLED3C9aSN+d9 rdE+oGc78hl/v8wW+1FY9+N+V+26V3WQTKs/rhUKxBPZHrNkFnwqSfxv6oRwJhrL d4gu7cU+WGEwWpZ43JxuliQKplJZogQAB8XaI1vCKG6s3hds/KrbKDofR1tefcJs kYNy9eIvVAJmIuzWRXC6E7VPZWoJN4JKYltwinOXezBaHjlEHLPscLk15AWnlyq9 sLC2nEdq3PMqYVOtK4lvphON8OBWolz8g6NmZzp4gmdAcu9swE+wdg== =uo+o -----END PGP SIGNATURE-----