Xbox 360 Jtagged - Falcon - Very first diagram - Worked fine, now e79 always

[tinchote]

Holy crap. You are all saying that those are not 10k resistors?

I used the tester on ohms measuring (omega symbol), and put it on "20k". The value for those resistors is 9.85-9.60.

How can it be?

[joeyddr]

i believe orange black brown is 300..... but if your meter reads 10k then you should be good.

[joeyddr]

nevermind man I looked at your resistors upside down. sorry for that.

[tinchote]

Thanks anyways, Joey. It was a small glimpse of hope.

It seems something is screwed up in some way. The console stills works with the original nand (I hope, it did once in a test)

[tinchote]

So my xbox is now flashed with my original nand backup. My jtag wires don´t work. I did the new jtag by the way.

Any clues why is this?

-Shortcut? help!

[cory1492]

When you say "I did the new jtag by the way" do you mean alternate jtag points? If so, are you building your NAND image with a properly modified SMC binary?

[tinchote]

When you say "I did the new jtag by the way" do you mean alternate jtag points? If so, are you building your NAND image with a properly modified SMC binary?

I did the new jtag diagram using transistors, etc. Checked and double checked for the solder points. I used two nands, the first I had working (xbreboot 3 for falcon, the very same bin file that worked before) and the pre-made nands in this same forum. None of them worked.

This problem appeared when I was trying to close the xbox 360 and I pushed the dvd drive a bit strong. I am suspecting of the wires that perform the nand flashing, but the nand flashing goes great, so I can´t understand what is interfering to get the jtag going ok and not e79.

[cory1492]

E79 usually indicates xam could not load, if the exploit doesn't fire/deliver the GPU JTAG commands this is exactly what happens as well - xam.xexp in flash is too new to load against the exploit kernel so if the exploit doesn't take over you get E79.

Is it possible that when you "pushed down" on the DVD you shorted one of the exposed transistor legs to either the DVD case itself or the GPU heatsink? One thing I would check with a dmm is, using outer copper or other clearly grounded point as ground with dmm in 20V or so range, whether you get activity (>1V at any time after you power it on, it may only be very brief but it should spike) right at the j2d2 points. It could be anything from a overloaded GPIO that no longer can drive the pins high to something wired up in the wrong direction (or even just burnt components from the DVD housing being ground.)

Considering it's also a falcon, I have also heard some cases where a resistor or diode is required between j2d2.7 and j2d2.4 rather than just a straight jumper. That it worked fine before suggest some damage has been done, so in your case this is unlikely but worth a shot if you are getting activity on those pins.

[tinchote]

E79 usually indicates xam could not load, if the exploit doesn't fire/deliver the GPU JTAG commands this is exactly what happens as well - xam.xexp in flash is too new to load against the exploit kernel so if the exploit doesn't take over you get E79.

Is it possible that when you "pushed down" on the DVD you shorted one of the exposed transistor legs to either the DVD case itself or the GPU heatsink? One thing I would check with a dmm is, using outer copper or other clearly grounded point as ground with dmm in 20V or so range, whether you get activity (>1V at any time after you power it on, it may only be very brief but it should spike) right at the j2d2 points. It could be anything from a overloaded GPIO that no longer can drive the pins high to something wired up in the wrong direction (or even just burnt components from the DVD housing being ground.)

Considering it's also a falcon, I have also heard some cases where a resistor or diode is required between j2d2.7 and j2d2.4 rather than just a straight jumper. That it worked fine before suggest some damage has been done, so in your case this is unlikely but worth a shot if you are getting activity on those pins.

Thanks so much. I have a tester, will go grounding and 20v test on j2d2 points. If I get a peak is it good or not?