Here is a picture I found in the document below and it shows extra details the Headers and Connectors 1.4 document and it could make us close to breaking xbox code! Below i added some extra info J8C1 - CPU JTAG PORT J9A2 - XDK SIDECAR PWR PORT J7G1 - RF MODULE ( ARGON ) J1F1 - DBG LED PORT J1D2 - SPI PORT J2B1 - SMC KERNEL DEBUG PORT J1F1.5 IS THE SMC LED. IT IS 3.3V SO ADD A LED TO J1F1.3-J1F1.6 TO THE PORTS AND GROUND AND YOU HAVE 4 DBG LEDS WITH PIN 5 SMC LED J8C1 IS DISABLED VIA EFUSES. CHECK OUT MY EFUSE POST HERE TO ENABLE CHECKSTOP LED YOU NEED TO ADD THESE PARTS TO J8C1.1: R8B6 - RES,S/M,LF,2KOHM,1%,1/16W,0402 R8A5 - RES,S/M,LF,1.0KOHM,5%,1/16W,0402 Q8B6 - BJT,S/M,LF,NPN,SWITCH,2N2222,SOT23 D8B4 - LED,LF,GREEN,QTLP601C-AG,0603 TO ENABLE FULL DEBUG ON J1D2 AND J2B2 YOU NEED TO: ADD (RES,S/M,LF,1.0KOHM,5%,1/16W,0402 ( NEAR DVD SATA PORT )) to R1C4 REMOVE R1P2 (WAS RES,S/M,LF,10KOHM,5%,1/16W,0402) (UNDER BY DVD SATA PORT) i GOT INFO FROM SITES AND THE XDK.DOC Original Document below: