Random e79 on jtag?

[CheaterTheHax]

turned off my xenon jtag to leave my house. came back and it has e79. tried unplugging ALL cords and HDD. no luck. tried reflashing back to stock. no luck. wtf?

 

[RED IMPACT]

Send it to M$ for a repair...!

Tried clearing the cache? Tried a different HDD?

 

[Martin C]

E79 on a JTAG = GPU needs a reflow or replacement.

You can check by getting resistance values for J2D2.1 and J2D2.2. They should both be the same (either 500Ohms or 1.5k). If one of them is out, there's your problem. FYI, both these points connect directly to the GPU via 1.5k resistors.

 

[CheaterTheHax]

il measure the resistance. il let you know, thanks!

---------- Post added at 11:22 ---------- Previous post was at 11:14 ----------

ok, i checked both, they are both 169.5

 

[Martin C]

Where did you measure them from? also, the console needs to be off and unplugged.

 

[CheaterTheHax]

measure from J2D2.1 and J2D2.2. console was however plugged in at the time. not running but plugged in.

 

[Martin C]

unplug and re-do. If you're still getting even values and E79, check over your wiring in case something's come loose.

 

[CheaterTheHax]

im showing nothing when its not plugged in. thats 00.0

 

[Martin C]

Then you're not checking correctly.

Red probe on J2D2.1 and black on a ground point on the board.

Do the same with J2D2.2

BTW, if you remove the wiring and reflash original NAND, does it boot?

 

[CheaterTheHax]

i put the red probe on the J2D2.1 and .2, with the black probe on the aluminum surrouding the HDD connector. i show 00.0 on resistance on the "200" setting. i have tried flashing back to stock. no boot. still e79

 

[CheaterTheHax]

im in the process of reballing as we speak. maybe that will work.

 

[Martin C]

New GPU or cleaned existing one?

 

[CheaterTheHax]

cleaning the existing one.

---------- Post added at 13:41 ---------- Previous post was at 13:40 ----------

i do have another xbox. possible to transplant the gpu?

 

[Martin C]

would need to be a non-HDMI too.

 

[CheaterTheHax]

ok, thnx. il post back with results in a bit.