Coma Console Fix found
The following tutorial is by Tizz78
Coma Console describes the situation
where your Xbox will no longer boot, you see a blank screen, no audio but the
LED light turns steady green just like it would look if it were working fine.
This fix works only on 1.0 and 1.1 consoles since the first Xbox mother boards included a 1MB bios chip, this chip is divided into 4 256K banks, the steps
described below are used to force the Xbox to use one of the other three banks
since the primary bank has become corrupted. Boards 1.2 and beyond have a
different bios chip this means the only possibility for fixing those is using a
modchip to replace the faulty bios.
STEP 1 :
Open the XBOX using the TORX 20
STEP 2 : CAREFULLY remove the DVD and Hard Drives(After grounding yourself of
STEP 3 : Unplug All POWER and IDE cables . Also remove USB controller board .
STEP 4 : Remove all screws securing the motherboard to the case . CAREFULLY
remove board .
STEP 5 : Flip over motherboard and locate the following items : Capacitor C6R3
and Resistor R7R2 .
(Picture borrowed from
tutorial by Jujupinto85
www.xbox-scene.com/articles/multibios-tsop.php re-posted with permission)
STEP 6 : Solder the jumper wire from the A18 or A19 to the ground point at the
right side of the capacitor .
STEP 7 : CAREFULLY re-install ALL components an test . If all works properly
then GREAT !! If it is still in a coma the you'll have to solder to the other
point . For example : If you soldered to A18 and you still have a coma console
then you'll need to repeat the steps above except solder to the A19 point and
re-test . If problems still persist , all is not lost . Repeat steps above
except solder to BOTH points .
I used .022 ROSIN CORE solder and 28AWG wire for mine and it works perfectly !!
Good Luck and Happy gaming with your re-born XBOX !!
Discuss this tutorial in the Llamma