Jasper 16MB CB6754 wont boot with Coolrunner rev C

evolvergt

Full Member
Mar 4, 2012
80
8
Guatemala
TX Product(s) used: J-R Programmer v2, Coolrunner rev C
Console Type
: Jasper
NAND size: 16MB
Dashboard version: e.g 2.0.15574
CB version: 6754
Screenshot of NAND details from J-Runner:

Untitled-1.jpg


Image of Coolrunner:
IMG_0063.jpg

Images of close-up soldering to motherboard:
IMG_0062.jpg

IMG_0065.jpg
Description of problem:

I wrote the created ECC back to the jasper but it only blinks green without booting to xell, I tested with the shielded wire, and with a Coolrunner rev B before but opted to use the new coolrunner rev c.

Any help I will gladly appreciate!


Was the console working before you started: Yes, I tested the console with the coolrunner soldered and booted perfectly before writing ECC.
 

Ac1dR3d

Senior Member
Dec 4, 2011
110
0
Milky Way
xbox-club.ge
CHANGE JUMPERS ON CR!!!!!!!!!!! LIKE ITS ON IMAGES INSIDE THE JRUNNER!!!

you have to change 2 jumpers there m8
 
Last edited:

BrockThunderjam

VIP Member
Jun 25, 2013
1,503
88
Try jumper 2-3. And hot glue!!! Thats a no no. Great pics though, wish everyone would post pics like that.

Also, I usually have better success with the top side cpu_rst. Short wire routed towards the back near the fans.

Also, try writing back the original NAND and set the cr to program and see if the console boots just to eliminate install issues.
 
Last edited:
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evolvergt

Full Member
Mar 4, 2012
80
8
Guatemala
Console boots fine with stock nand.

Tested with top side cpu_rst, with blue wire and shielded wire without a go, also tested with jumper 1-2 and 2-3

I have glitched jaspers but when they only needed RGH2 this one I had to change it to RGH2 since jrunner chose jtag for me, please any more tips I would greatly appreciate
 
Last edited:

jekdyell

Senior Member
Mar 9, 2013
119
0
leave the coolrunner as default when you got it out the package.

just remove the C8 cap from the coolrunner only.set the switch to slim,try it with timing file A or B.

and use 35cm wire for the cpu rst point.kynar wire i find best to use..
 
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evolvergt

Full Member
Mar 4, 2012
80
8
Guatemala
leave the coolrunner as default when you got it out the package.

just remove the C8 cap from the coolrunner only.set the switch to slim,try it with timing file A or B.

and use 35cm wire for the cpu rst point.kynar wire i find best to use..
Just tested with that without a go :/

If it doesnt boot in 15 min it wont boot at all (I think)
 

evolvergt

Full Member
Mar 4, 2012
80
8
Guatemala
I just wanted to update my success with this Jasper RGH2 on a coolrunner rev c:

50cm reset wire with special placement
1-2 jumpers
cap bridged
reinstalled C8 CAP (this made it almost instaboot!!)
RGH2_B timing file

...and here are a couple of pictures of the coolrunner and wiring, thanks to everyone who helped me with this stubborn console!

IMG_0067.jpg

IMG_0068.jpg
 

BrockThunderjam

VIP Member
Jun 25, 2013
1,503
88
I just wanted to update my success with this Jasper RGH2 on a coolrunner rev c:

50cm reset wire with special placement
1-2 jumpers
cap bridged
reinstalled C8 CAP (this made it almost instaboot!!)
RGH2_B timing file

...and here are a couple of pictures of the coolrunner and wiring, thanks to everyone who helped me with this stubborn console!

View attachment 24295

View attachment 24296
Thanks for the update. Glad you got it sorted.