Plagued with E79

[radddogg]

Hi,

I have a xenon jtag that is plagued with E79. I know what you will say, check your soldering but just give me a minute to explain what's happened so far.

I jtagged the console in April using two zener diodes and it worked fine for a few weeks. Then it suddenly e79'd on me. I was told it was my soldering even though it had worked flawlessly for weeks. I resoldered, even replacing the diodes but had no joy. I took pictures and it was confirmed that my soldering was fine. Someone then suggested using 330ohm resistors. This seemed to work.

However, a week later and the e79 was back. Again my soldering was questioned so I resoldered to no avail. I tried diodes again and voila it worked again! I ran through set up and it went normally. Rebooted to check dashlaunch and bang! E79.

If I flash freeboot it e79s but if I flash stock nand then it boots up fine into dash 7371 so it has to be related to the jtag circuit.

I've tested the diodes with a multimeter, tested the resistors too and they are fine. I've scraped back the insulation on all the traces to test continuity and my soldering isn't in question. Something further down the line is going wrong but I don't know what.

Can anyone suggest anything I can try? Is there an alternate method?

 

[manwithoutname]

You could try the 440ohm resistors or even higher, I have tested 660ohm resisters on a jtag and it worked. You can also try switching diodes instead of resistors.

Another possibility is that it could be software related and not hardware. As you boot your console and continue to use it, the NAND image will change as it rights to it self. So you might want to explore that area too.