JTAG J1D2 pins Voltage on PSU connection going down

[bsmisl]

Hello,

I Searched alot about my problem, but nothing appeared, so i had to write a new thread!

Preface:
I own a Falcon, that i managed to RGH on the 14719 succesfully with the QSB, Coolrunner Rev B. and J-runner. The Glitch worked succesfully and the glitch timings were only a couple of seconds, so no problems there.The motherboard was allways in the "metal box" all the time.
It ran for a day and i played around with XeX and FSD, and then i started to try and create a new NAND image and connected the NAND-X with the QSBs.:facepalm:
Here the problems with the Reading/writing from the NAND-X started, but after a lot of measuring and forum searches i didn't find a simmilar problem...
I had Xcell allready loaded, so i could load the nandflash.bin succesfully from USB.


The problem:
It seems i have done something to the MB because all of the sudden the Xbox 360 will not turn on, cant read NAND and the most important, the J1D2 pin values are not correct!
To be specific, the values of the J1D2 when PSU connected are:
1 - 0,22 V
2 - 0,11 V
3 - 0,22 V
4 - 0,01 V
5 - 0,00 V
As i found out with the Searching the values are not correct, so that is probably the reason why i can not do anything to the NAND.

I also found out that before i connenct the PSU on to the board, the values are:
1 - 0,00 V
2 - 0,25 V
3 - 0,00 V
4 - 0,25 V
5 - 0,00 V
Is that normal?

Also i checked the values at the time when i connect the PSU to the MB, and the values go up as they supposed to on all the mentioned pins, but they start to drop very quickly to the values mentioned above.
As if something is draining the voltage away?

So now i'm trying to fix it, so i can again try to read/write NAND and ofcourse power ON as i did before on the same board.

Thanks in advance,
b

 

[axee44]

Sounds like bad/corrupt smc if it stopped booting after writting nand image.

 

[tonyjandc]

looks like you are going to have to short out your nand chip to blank it then reflash orginal nand back to chip and start again as stated above looks like bad smc so no power.

 

[hersheys247]

Hello,

I Searched alot about my problem, but nothing appeared, so i had to write a new thread!

Preface:
I own a Falcon, that i managed to RGH on the 14719 succesfully with the QSB, Coolrunner Rev B. and J-runner. The Glitch worked.

14719? RGH?



Sent from my brain tumor causing device using Tapatalk

 

[bsmisl]

Hey, on the falcon was before an older version of dashboard, and then i created the 14719... To answer your hunches.

---------- Post added at 05:55 ---------- Previous post was at 05:51 ----------

So, about the possible solution:
How can I:
"short out my nand chip to blank it" ?
"then reflash original nand back" ?

I saw some solutions that suggest me to use a flat screwdriver, to brick the pins (47-44)on the NAND chip?
But, then i need to write my original nand back with nand-x normaly?

 

[bsmisl]

Hey,

I'm unsuccesfully trying to suceed with the SMC repair that i found:Bad_SMC_Flash_2.pdf

Is there any other idea that is more succesfull?

 

[bsmisl]

Hey,

I'm back from my SMC repair.

No success!

Now it is even worse, because the voltages, when i connect the PSU on the J1D2 pins remain 0V.

Does this mean i blew something else and destroyed my beloved 4 years old Falcon?

Thanks for the answers,
b

 

[sm0k4 187]

Its not booting, so the voltage isn't coming up. Were you able to read/write the nand after shorting it? You have to remake the image or go back to an old working one for testing. I had this happen to me and reflashing only the xellous image allowed it to boot. From there I rebuilt my image and got it going.

 

[bsmisl]

Hey,

No, i did not manage to write to nand, so i'm still at the 0 Volts on the pins.

I read that i might destroy the fuses or the SouthBridge...
If so, then my board is dead.

 

[bsmisl]

Hey,

I desoldered the QSBs, installed them and the board has different Voltages that I had before.

The J1D2 Voltages when Nand-X is not connected are now:
1 - 2,6 V
2 - 3,3 V
3 - 2,6 V
4 - 0,0 V

but as soon as i conenct the nand-x programmator the values of the pins are:
1 - 0,0 V
2 - 1,0 V
3 - 0,0 V
4 - 0,0 V


What should be the correct values when the Nand-x programator is connected and disconencted?


Thanks,
b

 

[opulent]

Try directly soldering the wires to the board and check if your voltages are the same as when not connected you may have something shorted with the qsbs