JTAG Xenon JTAG E79

[RedFarmer]

Hey everyone!

I have this stubborn Xenon board which i've tried JTAGing for a while now. I used NANDx with the pin headers to dump the NAND. 6 reads total and 0 bad blocks.

I use Coolshrimps JTAG Tool and write Xell. After that i try to boot it up to get my CPU key but all that happens is that i get an E79 with secondary code 1033.

I'm a noob at soldering and know my job is a little sloppy with a little too much solder here and there but i've measured the points with a simple voltage detector (which also tells me if there's contact between A and B) and seems ok.

I ran into some problems soldering the first point at J1F1. The solder would not stick to the point no matter what i did. My solution for that might be stupid, i don't know. I put a pin through the hole (got a pin much the same as the Team Xecuter pin headers from an old video card) and then soldered it from the bottom which worked alot better (see pic).

I have even resoldered every JTAG point one more time just in case, still E79. If i flash the original NAND back the console boots up just fine.

Do i need the Xecuter E79 JTAG QSB's?

Here's some pictures on the JTAG part (cable between QSB's is removed). There's some flux left so it might look somewhat messy:

Pin soldered to J1F1 on bottom of the board:

Please give me some advice. I'm soon giving up on this one

Thanks in advance!

RedFarmer
Sweden

 

[marshamods]

e79 if not always is bad soldering job, redo the soldering job, and be sure to use flux this time.

 

[RedFarmer]

Thanks for your reply!

I used plenty of flux which can also be seen by all the residue that I haven't cleaned yet.

I have replaced and resoldered the QSB at J1F1 and also resoldered J2D2 but if that is your recommendation I could ofcourse try it all over again.

Do you know in which rare cases the E79 QSB's solves these problems?

Concerning that the first point at J1F1 doesn't attract any solder (even after cleaning with a fiberglass pen and using lots of flux) I hope the method I used with the pin isn't too off? Maybe the point doesn't get hot enough with my 15W iron?

Thanks!

 

[yamackbuddy4]

Try pulling the qsb and going with wire and diodes for the tag poins. I have not used the qsb so I have no idea how the work but only time I have had e79 on a xenon was when I forgot to solder my tag points.

 

[marshamods]

I dont want to suggest a higher wattage iron considering you might torch your box. Though I would go for a 25 30 watt iron. Just make sure not to hold it on the board too long or you will rip the pad off and need to get it repaired.

 

[playingmax]

use Coolshrimps JTAG Tool 2.20 that should fix your problem

 

[big_ted]

This point looks poor, the others aren't great but that one looks like it has missed.

Ted

 

[RedFarmer]

This point looks poor, the others aren't great but that one looks like it has missed.

Ted

That was it!! This 360 is now officially JTAG'ed!

I can't believe how I could miss that point! These QSB's are so small so I guess I just didn't notice. I can't understand how many times I've checked the solderings etc. and still missed it. I need to go hide somewhere now

Thanks to all who gave me suggestions but especially you big_ted!

One final question. Using JTAG Tool 2.76 I made 3 identical dumps. While I was struggling to get this working I made 3 additional matching dumps. No read errors. When I now got the CPU key I could extract the KV info just fine with any of the first 3 dumps, but using any of the last 3 gave me an error saying it can't be decrypted because of an incorrect CPU key. How come?

Thanks again!