JTAG Strange E74 error??

[Mikebyrne]

There's something wrong with my 360. I've replaced the JTAG wiring (2 diodes, 1 jump wire) with the defacto standard (2 resistors, 2 transitors - the blackaddr way) and I'm getting an E74 when I try to boot freeBOOT.

I've tried several versions of freeBOOT, including the one I did on the console the first time. I've tried writing to the nand via the nand-x and Xell. All of them produce the E74.

The fact that Xell is booting suggests to me that the JTAG wiring is fine. I know Xell is 100% CPU driven, so it's possible to have Xell work, and not have a hacked dash work.

And here comes the head scratcher - the stock dashboard seems to work just fine. I didn't test it, but when I restored it the console booted into it fine with no E74. And for the final kicker, on one occassion when flashing the nand via Xell I saw artifacts on the screen. I literally couldn't make out the text such was the video corruption.

Any idea what could be wrong??

 

[BGAMods]

if it was mine id just reball the GPU to rule it out.

 

[Mikebyrne]

It's just back from a reball last week

 

[dpcragg]

n its still e74

 

[diaboliq20]

I feel a visit from MartinC here telling you to check the soldering or post pics lol

 

[Mikebyrne]

It boots back to stock dash fine

 

[diaboliq20]

does it boot back to stock fine every time, and run or was it just a one off test?

 

[Martin C]

I'm going with faulty GPU at this point. Did the person who reballed it replace the GPU or just reball the old one?

Freeboot consoles make calls on the GPU in ways that stock dashboard and native XeLL do not. Combine that with the artifacts on the screen would point to it being the problem.

 

[diaboliq20]

I'm going with faulty GPU at this point. Did the person who reballed it replace the GPU or just reball the old one?

Freeboot consoles make calls on the GPU in ways that stock dashboard and native XeLL do not. Combine that with the artifacts on the screen would point to it being the problem.

You just said that to make me look silly now didn't you? lolol

 

[Mikebyrne]

Thanks for the help, I might just send it back to the guy who reballed it and see what happpens.

What should I write to the Nand before sending it back??

Im half afraid to return it to stock because its not throwing the error

 

[diaboliq20]

I would imagine you should put it back to a state where it throws the eror for you, and then that's a good testing bed for the repair

 

[Martin C]

If they guy does JTAGing too, flash the stock NAND to it so he can see it works and send him your freeboot image with it (so he can see it doesn't!).