it means that > 10 seconds, or > 260°C and say bye bye to the chip. If anyone has a heat gun it's easy to extract the chip, sorry I don't have one so I can't help for it. > Maybe the 1st problem we have to solve is to extract the chip from the > PCB while taking care of the data on it. The data sheet said "Surface > Mount Solder Reflow Temperature . . . . . . . . . . . . . . . . . . . > . . . . . . . . . . . . . . . . . . . 260°C for 10 seconds" on P9. > Actually I don't understand this sentence very much. Does that mean > we have to heat up the PCB for 10s or more time at 260°C to get the > solder melt, or the maximum time we can heat up is 10s, or anything > else? Thanks. > > David > > On Feb 1, 2008 10:05 PM, MsTiFtS <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Emmanuel Fleury schrieb: > > tof wrote: > > > >> this is a standard flash, with 1.8V power supply. > >> I can do it. > >> > >> desoldering could be difficult if it is glued. > >> > > > > So, if I do understand well, it would require to extract the > chip from > > the iPod (without heating it too much to not loose the data) and > then > > plug it onto another socket where we can read it. > > > These chips rather die completely than lose their data. > > What kind of hardware do people usually use for such desoldering > without > > harm for the chip ? And where can we usually find it, and > eventually how > > much does it cost ? > > > Usually it's best to heat up the PCB while pulling the chip away from > it. You will need about 260°C to make the solder melt, but the chip > should not be heated above that temperature for more than 10 > seconds. So > you need something that heats up the PCB really quickly. One usually > uses some kind of hot air blowers for that, but if you want to > take the > risk, you can try to do it with some kind of gas burner. > >> resoldering : its possible to solder each ball to a wire > >> > Well, if you have appropriate soldering equipment, it's possible > to do that. > >> readout : i have some avr capable of 2.7v operation. can be easily > >> interfaced with a 1.8v device. > >> > > If we could have the electronic schema of such reader (and some > > information on how to interpret the data once we get it) it > would be great. > > > Connect A0-A18 and DQ0-DQ15 to the AVR, CE#, OE# and Vss to GND, > WE# and > Vdd to 1,8V. Depending of the kind of outputs the AVR has, you may > also > need to use resistors for the Axx connections, or you may need to > connect Axx to 1,8V through some resistors. A datasheet of the AVR > would > clarify this. > The data we will get out of it will probably be some kind of ARM > executable code, which can probably be disassembled by IDA Pro etc. > In case they should have taken precautions against that, the > content of > that chip may also be encrypted with the decryption code and key being > in a small internal ROM in the ARM, supposed it has one. Then we would > need to "sniff" the contents of the RAM at runtime, or somehow record > the data transmitted by the ARM to the RAM at boot time. > > _______________________________________________ > Linux4nano-dev mailing list > [email protected] <mailto:[email protected]> > https://mail.gna.org/listinfo/linux4nano-dev > http://www.linux4nano.org > > > ------------------------------------------------------------------------ > > _______________________________________________ > Linux4nano-dev mailing list > [email protected] > https://mail.gna.org/listinfo/linux4nano-dev > http://www.linux4nano.org
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