Nice shame it failed thanks for the update i will be looking on ebay for broken ipod nano 2gs
On 5/2/08, tof <[EMAIL PROTECTED]> wrote: > Hello everybody > > > I have some news. > > This week i tried to extract the bootloader from a flash, but the chip > was damaged dduring the soldering, either by the iron heat, or static > electricity, or mechanical stress during "unsoldering" > > > what i did : > - "unsolder" the flash by pulling it (brutal, next time i will unsolder > by hot air) > - glue it to a test board > - solder 40 coil wires to the balls > - check electrically the connections via the clamp diodes presence. i > automated this step. > - check shorts between wires (automated) > - read it out with a microcontroller and send the results to a serial port > > > the electrical tests fail, there are some clamp diodes lacking (failed > pins, especially /OE). > > some photos of the different steps are available here: > http://f4eru.free.fr/flash/ > > I will try again as soon as i find another broken nano. > > a few advises: > for the unsoldering, i lifted the chip with a blade. This probably > cracked the die, so next time i will try unsoldering with hot air. > the BGA is glued down, so i do not know how the glue will behave in the > hot air. lifting the chip was not too difficult, the glue was not too > strong. > if hte hot air fails, another method is to bend the pcb, then the balls > renmain on the chip and not on the board like i had. i tried it after > with hte ram chip, it seems to work . > > use very thin wires, i first tried with thicker ones, but it makes > mechanical stress on the solder joints > use a very thin iron tip, not too hot, because we solder directly to the > chip. > use a good magnifying glasss and thin tweezers. > static electricity countere measures are needed. > first put solder on 1/2 mm of wire to get rid of the lackering. the iron > heat together with the flux burns away the lackering. You can use a > second iron with a normal tip and hotter setting for this part. > then gently and very quickly press the end of the wire onto the ball > with the iron tip. then place, cut and solder the other end of the wire. > > We now can extract the bootloader, but we really need your help !! > We need broken nanos II to succeed ;)) > > > > bye everybody > > sto > > > > > Emmanuel Fleury a écrit : >> Emmanuel Fleury wrote: >> >>> I'm currently in a conference in Budapeste, I'll be writing an update >>> about what the students did after my return. >>> >>> Basically, they do not have any 100% proved facts but they proved me >>> wrong and they are considering RC4 as a good candidate. >>> >>> About the chip, I'll try to make some progress when I'll have some time >>> as well. >>> >> >> I'm back but I'm a bit overloaded with work. I'll do the report summary >> as soon as I can. >> >> Stay tunned (and don't hesitate to DO something better than asking for >> some updates... It's kind to ask but I prefer people who do actually >> produce things ! ;)). >> >> Regards >> > > > _______________________________________________ > Linux4nano-dev mailing list > [email protected] > https://mail.gna.org/listinfo/linux4nano-dev > http://www.linux4nano.org > -- Sent from Gmail for mobile | mobile.google.com _______________________________________________ Linux4nano-dev mailing list [email protected] https://mail.gna.org/listinfo/linux4nano-dev http://www.linux4nano.org
